High oil temperature lycoming engine. It generally settles in at 73 psi.

High oil temperature lycoming engine. Add either new clean mineral oil (if within the first 50 hours of operation of a new, rebuilt or overhauled engine or an engine that had a cylinder and/or piston rings replaced) or specified oil of the correct quantity and viscosity for the ambient temperature (identified in Appendix A) to the oil sump through the oil level gage tube. 2. Jun 28, 2019 · "Oil Temperature: The maximum permissible oil temperature is 245°F. At temperatures below +10°F (-12°C), Lycoming recommends pre-heating the engine and oil supply tank regardless of the type of oil used. At each oil change, this specific information should be recorded in the engine logbook. Non-adjustable Oil Pressure Relief Valve - Although the valve is not adjustable, the oil pressure can be controlled by the addition of STD-425 washers under the cap as required (maximum of three) to increase pressure or the use of a spacer (P/N 73629 or 73630) to decrease pressure. ” It's not a worry, the oil will warm up rapidly in takeoff and the pressure will go down. ) I seriously doubt that oil temperature is the problem here, so that article may be of some help also. The -L part number is for all Lycoming Direct Drive Engines and is installed in tile Right (passenger side) front Oil galley by removing the present 1/8 NPT plug (see fig-6). ENGINE Cylinder Head Temperature Absolute Max 260?C Longevity Limit High Power Cruise 224?C Econ Cruise 203?C Lycoming Recommend maximum temperature change of 28?C per minute. I continue to receive questions on which oil to use and the compatibility between oils. The Lycoming team helps you stay up-to-date on industry insights, and provides information about how to care for your engine. Mar 23, 2012 · CHT was never higher than normal so I kept flying, and engine ran fine the whole time. A temperature between 385° to 435° is ideal for long term Jun 16, 2004 · I'm not real familiar with that engine but, most aircraft engines with an oil cooler have a control valve to let oil to the oil cooler or to bypass the cooler. We usually are very cautious about high oil temperature which we know is detrimental to good engine health, while a low oil temperature is easier to accept. As a preventive measure, prior to every take-off, make sure the engine oil level is sufficient, as specified in the aircraft Flight Manual or Pilot Operating Handbook. Since your CHT and oil pressure are normal with oil temp at red line, I would first look at an indication issue. Modifications and Why 180˚? Visser explains that the peak oil temperature in a normally aspirated engine is typically 50˚ F higher than the temperature of the oil in the sump, the location of the sensor. Though some air cooled engines warn against high RPMs at low oil temps. It's called a vernithane. TIME OF COMPLIANCE When preservation oil is removed or when lubricating oil is changed or added. Temperature and pressure Avoiding oil and cylinder head temperature and pressure limits is a bit trickier. Low oil pressures will produce increased oil temperatures, and vice versa; overly high temperatures thin the oil and can cause a lower-than-normal oil pressure reading. Page 57 LYCOMING SERIES OPERATOR’S MANUAL SECTION 7 O-320 INSTALLATION AND STORAGE SECTION 7 INSTALLATION AND STORAGE 1. Occasionally we find a Continental W670, Lycoming R680, or Jacobs R755 engine that in running higher than normal oil temperatures. --check @ 8 qts. After noticing the high oil temp, I lowered the nose a bit and richened the mixture and oil temp started dropping. May 22, 2017 · Neither Cessna nor Lycoming say anything about checking the oil temperature before runup. The minute I throttle back on downwind, flap and gear, the temperatures increase. I've have an O-360 ECI Titan engine that came from the builder set for the low 70s. Then I'd verify you have decent flow through the cooler. Mar 7, 2021 · If you refer to your Lycoming Engine Installation and Operator’s Manual for the IO-390-Series, (P/N IOM-390-C), issued January 2017, you’ll find that a maximum oil consumption quantity is published on Page 53 of Appendix A, Table A-2. The additives in some of these ashless dispersant oils may retard the break-in of the piston rings and cylinder walls. We have 2 Textron Lycoming O-290-D2 Aircraft Engine manuals available for free PDF download: Operator's Manual Altitude Performance Superior Vantage O/IO-360 Series Best Power Altitude Performance Example: Flying at 25. Pilots are often not at all concerned about how this function occurs, as long as the oil pressure and oil temperature indicators show a proper reading. I would take a real close look at the grounding of the engine. Pretty similar to every other engine out there. For maximum engine life, maintain desired oil temperature is 180°F (82. The temperature is routinely getting into the 186F temp range. I've been noticing lately that my oil temp will frequently reach 210-220, sometimes as high as 235 while in an extended climb. May 5, 2020 · Would like the source for that one. Oct 19, 2015 · I posted a previous thread regarding high oil temps on a 1975 Cessna 172M with Lycoming O-320-E2D. At that point, it was maybe about a 5-8kt direct cross wind, and that’s when I noticed the needle was right on the red, so Oct 19, 2007 · Limitations Rick, Here are the figures I extracted from the Lycoming Manual for my IO-360M1. This operator’s manual contains a description of the engine, its specifications, and detailed information on how to operate and maintain it. I have heard different theories on whether this is normal or not. Aug 24, 2010 · Hello All, I have a PA-20-135 with a O290-D2 powerplant and the oil temperature has been running high, stabilizing between 220-230F, only after enriching the mixture while at cruise airspeed. I took off, climbed at Vy and turned 90 degrees left and leveled off at about 2500ft. We have a 1975 Cessna 172M with Lycoming O-320-E2D engine. This means that 212° may be too high. The symptom is high oil consumption due to blow by. Good Luck, Brian Click to expand Jan 28, 2022 · Oil temp climbed up to 240 and oil pressure dropped to 35-40psi for flight. Textron Lycoming strongly recommends that all engine instrumentation be calibrated annually. I have only the oil temperature gauge. My life and my wallet get hurt. In this engine we have AeroShell W100 Plus oil filled to the 6 QT mark. Oct 19, 2015 · Hi all. Jan 8, 2013 · Not knowing what aircraft your engine is installed in, I can say from my experience that in most four-cylinder engines installed in a typical Piper, Cessna, or Mooney, it is usually the #3 cylinder that runs the hottest just because of its location. Is this a cause for concern? I hear that the new Lycoming is now sett May 19, 2024 · The only other thing that I can think of regarding this type of situation is an article I wrote back in July 2014 mentioning the use of a glass bulb thermometer to check engine oil temperature (Ask Paul: Tips to troubleshoot high oil temps. This is always defined by the airframe Mar 25, 1994 · Lycoming strongly recommends that all engine instrumentation be calibrated annually. Also taxiing on the water (80 F ambient) and the oil temp will continue to rise at 1,000 RPM. Making sure you have enough oil and the right type goes a long way to keeping things happy. If the aircraft has a winterization kit, it should be installed when operating in outside air temperatures (OAT) that are below the 40 to 45 degree F. Heat is wear & tear. The rings may not seat properly resulting in higher than normal oil Oct 9, 2004 · Zane, is the 172 powered by Continental or Lycoming? I've always hears that the Lycoming 320's run fairly cool. Engine Has Poor Acceleration Insufficient oil in oil sump, oil dilution or Add oil, or change oil to proper viscosity. Just under 6 isn't reason for concern. The -C part number is for all Continental Direct Drive engines and is installed in the Left Dec 31, 2021 · Stress is high temperature and high load. Possible causes of high temperatures may include broken or missing baffles, inoperative cowl flaps (if applicable), or restricted fuel inlets (resulting in lean-running cylinders). If no, then it could be an instrument problem? Is the temperature gauge electric? If yes, perhaps there is a malfunction in the gauge components? Jul 29, 2020 · Supersedes Service Instruction No. 11] Loss of power going to altitude 12] Can not reach specified critical altitude 13] Low oil pressure 14] High oil consumption 15] High cylinder head temperature 16] Split in manifold pressure (twin engine) 17] High oil temperature 18] High manifold pressure at idle 19] High oil pressure 20] Manifold pressure fluctuations 21] The Bendix RSA Nov 7, 2011 · I am inclined to believe that 2 of 4 cylinders in my Lycoming IO360A3B6D developed glazed cylinder walls after about 850 hours SMOH. I haven't seen any significant metal in the oil, oil analysis comes back good and it doesn't use any oil. Recommendations for lubricating oil grade are found in the most current revision of Lycoming Service Instruction 1014. 480 makes these specific recommendations for oil changes under normal operating conditions: A. When the oil is 240 degrees or so, you should see the oil pressure drop. A later modification to the relief valve eliminates the need of the Dec 1, 2019 · Abnormal engine indications may be cause to land at the nearest airport and get things checked by a mechanic. First off, I am talking about certified aircraft engines like Lycoming, Continental, Pratt & Whitney, CW, etc. The information in this letter applies to all Lycoming engines used in Vans aircraft. Before installing an engine that has been prepared for storage, remove all dehydrator plugs, bags of desiccant and preservative oil from the engine. I have flown around 560 hours since overhaul, but have a high temperature on the left engine. Like Jr said, using 50wt (W100) bumps the redline to 240, up 5) Oil Temperature Probe The Oil Temperature Probe PIN 400505-C,-L is installed as a supplemental oil temperature indicator. My experience is that the Cont C-145/O-300 is notorious for running hot in the summer. C. New engines have been carefully run-in by Lycoming and therefore, no further break-in is necessary insofar as operation is concerned; however, new or newly overhauled engines should be operated on straight mineral oil for a minimum of 50 hours or until oil consumption has stabilized. B. Consequently, the cowl design should be of high efficiency to even pretend to meet this spec. A&P mechanics, on the other hand, often need to know how the system works and what parts control the flow Sep 20, 2018 · Key oil system components for a Lycoming engine: plug for return line from oil cooler, crankcase vent fitting, oil temperature sensor location, oil filter, plug for oil pressure sensor, oil pressure relief valve, plug for sump screen, plug for feed line to oil cooler. The other day while flying straight and level at 3,000' MSL, 69*F OAT, full rich mixture, CHTs were in the 350-375 range, and 2500 RPM, the oil temps rose Jun 30, 2016 · Normally its near 80-85 psi. Nov 16, 2016 · Have you guys heard of any weird lycoming 4-cylinder situations that would make oil temps unusually high for all conditions? I have an O-320-160 that's Jan 28, 2013 · Hello, I just installed a late model Lycoming with "piston oil squirters" and am seeing 205+ oil temperatures despite using a slightly larger than normal oil cooler. That is not to say this particular engine in your friends airplane is not having some other issues but I would first start by looking at the baffling, blast tube and other oil temp indicator components before investing in an after market New engines have been carefully run-in by Lycoming and therefore, no further break-in is necessary insofar as operation is concerned; however, new or newly overhauled engines should avoid low power below 65% during the first 50 hours of until the oil consumption has stabilized. Apr 1, 2011 · Keep the Entire Engine Instrumentation System In Calibration Don’t make adjustments to the engine (oil pressure, fuel pressure, etc. These temperatures are recorded at an outside temp of 30 degrees at 7,000 feet. This is where the location of the sending unit may cause you to see a different oil temperature reading. 1255 May 13, 2016 MODELS AFFECTED Lycoming engines using thermostatic oil cooler bypass valve TIME OF COMPLIANCE At 100-hour inspection or when high oil temperature is noted REASON FOR REVISION Updated bypass valve replacement part numbers; added respective detailed bypass valve replacement instructions for engines with oil pressure screens and oil filters Now I am experiencing high oil temperatures" seems to be pretty provocative. 4375-20 NF-3 thread is provided in the accessory housing for the installation of an MS28034-3 or equivalent standard type thermometer bulb for measurement of oil temperature. Lycoming actually does not know which cylinder runs the hottest on any particular engine installation. --checked BUT possibly plugged somewhere Jul 21, 2023 · And climb at high power but shallow angles / high airspeeds to avoid overheating. au Hope this helps, Pete. (118°C. I like to run my engine oil temperature at around 190°F or slightly above. I don't remember the exact temp and how much the pressure drop is. From a Lycoming service instruction for all engines published 2002: “Allow the engine to warm up at idle speed until oil pressure and temperature are stabilized within normal limits and proceed to ground check in accordance with the airframe manufacturer’s Pilots Operating Handbook. A thermometer well with a . " Some areas to look at are the intake and exhaust pipes for leaks, the ignition harness, breather, and the engine compartment for excessive oil stains, gas stains or exhaust stains. I've got a new (to me) 7KCAB equipped with a Pacific Cooler oil cooler. Jan 20, 2005 · The desired oil temperature range for Lycoming engines is from 165 degrees to 220 degrees F. I don't think you have reason to be concerned. May 2, 2022 · Hi all. Anyone have any expert advise? Apr 23, 2008 · The O-300 is notorious for a high oil temp indication and cessna put a cooling blast tube directed at the oil screen/temp prop housing to remedy that problem. range. com) or speak to Lycoming by telephone: U. Cessna is silent on the issue except for the section on cold weather operation: During cold weather operations, no indication will be apparent on the oil temperature gage prior to takeoff if Mar 6, 2024 · Having an engine monitor that displays and records CHT and EGT for each cylinder is also absolutely invaluable for detecting and diagnosing a wide variety of engine problems. 1505 for further information regarding pre-heating the engine. Cruise at 10K feet / 21 degrees OAT yeilds 190 Mar 18, 2018 · At what temperature does piston aircraft engine oil break down? This is not the same as the maximum oil sump temperature allowed for your engine. It sounds like it is not opening at all in your situation. 301F approves for use lubricating oils which conform to both MIL-L-6082 or SAEJ1966 straight mineral type and MIL-L-22851 or SAEJ1899 ashless dispersant type lubricants for aircraft engines. 22°C). New engines have been carefully run-in by Lycoming; therefore, no further break-in is necessary insofar as operation is concerned; however, new or newly overhauled engines should be operated on straight mineral oil for a minimum of 50 hours or until oil consumption has stabilized. S. --checked Using Aeroshell AD 100Wplus 4. Faulty instruments or thermocouples may cause erroneously high (or low) temperature indications. Page 67 LYCOMING OPERATOR’S MANUAL SECTION 7 O-320 SERIES INSTALLATION AND STORAGE SECTION 7 INSTALLATION AND STORAGE 1. Applicable Avco Lycoming engines installed in an aircraft that employs an external oil cooler to main- tain oil temperature are equipped with a P/N 75944 valve assembly - temp. Do these numbers Some require a specified warm up while others do not. Lycoming does not publish a maximum EGT temperature, but only states that the cylinder head temperature may not exceed 500°F for continuous operation. We landed at Smith Prairie and then Pine and after I noticed the high temps on the initial climb-out they did not creep up that high afterwards. Engines that have experienced detonation must be assessed for excessive temperature or loading damage by complete engine disassembly and inspection IAW the Overhaul Manual prior to returning the engine back The Lycoming oil additive P/N LW-16702 must be added to the O-320-H and O/LO-360-E engines at airframe installation, and every 50 hours thereafter or at every oil change. As someone else said, you need to use special oil in the first 50hrs of a new engines life. The additives in these oils extend operating temperature range, improve cold engine starting and lubrication of the engine during the critical warm-up period, thus Jun 16, 2014 · Skywagon, I have a small bone to pick re cooling tests being regarded as adequate on a standard output 150hp engine. Dec 30, 2005 · OIL TEMPERATURE Oil provides about 1/3rd of the cooling of an air-cooled Lycoming engine, and high oil temperatures can contribute to high CHTs. Nov 4, 2007 · What would cause a lycoming 0-320 engine to overheat under these circumstances? -oil is filled 7qt's with 100+ oil -oil pressure in the green always -just had oil/filter change 14 hours ago -engine cowling is free of obstructions Any ideas? -Ryan Background This Service Instruction identifies the necessary steps for engine break in, including engine preparation for ground operational tests, flight tests, after flight tests, and oil consumption limits for Lycoming engines installed in fixed wing and rotary aircraft. Let's learn about what causes high engine oil temperature. For example, when the oil supply is quite low, the engine will run hotter and the oil pressure will tend to read lower. So in that case there is no requirement to get any temperature, oil or cylinder head up to a specific value. It generally settles in at 73 psi. All instrumentation for manifold pressure, engine RPM, oil temperature, cylinder head temperature, exhaust gas temperature and turbine inlet temperature in the aircraft should be included in this annual calibration. During max power climbs it has wanted to climb higher than 230F, requiring enrichment and lowering the Oil Relief Valve (Adjustable) – The adjustable oil relief valve enables the operator to maintain engine oil pressure within the specified limits. For subscription information, look on Lycoming’s website (Lycoming. What was changed between "fine" and "high oil temperatures" Was engine work done? Did you install an engine monitor to replace the original oil temp gauge? Did you change brands or start using a multi grade oil? If an ashless dispersant oil is used in a new engine, or a newly refurbished engine, high oil consumption might possibly be experienced. That means there is no way to meet spec at any speed below 100 mph indicated. For example, the POHs of many aircraft equipped with Lycoming engines say if the engine is warm enough to take full throttle without hesitation, it is warm enough for takeoff. Lycoming says the redline oil temperature for my IO-540-D is 240°. Rough Engine Operation Low Power and Engine Runs Rough Low Oil Pressure On Engine Gage High Oil Temperature Excessive Oil Consumption When oil reaches a temperature high enough to require cooling, the oil temperature control valve expands and blocks passage, directing oil to the oil cooler. and Canada toll free: +1(800) 258-3279; or Direct: +1 (570) 323-6181. I have seen 0235 Lycoming engines with oil coolers installed but it involved an adaptor fitting in conjunction with the oil filter adaptor. Excessive engine temperatures, rough engine operation or vibration, or high oil consumption may be some indications of detonation damage. Jan 30, 2015 · What I remember is that red line is gauged for normal operations and Lycoming understands that oil pressure may run a little higher in a cold engine. What thoughts do others have on a good operating oil pressure? I've got the upper through bolt just forward of #1 Page 80 LYCOMING OPERATOR’S MANUAL SECTION 7 O-235 AND O-290 SERIES INSTALLATION AND STORAGE SECTION 7 INSTALLATION AND STORAGE 1. Very often a sudden loss of oil pressure is quickly accompanied by a sudden rise in oil temperature. Lycoming manual states that if engine will take throttle application without stumbling or other symptoms, it is warm enough for Take Off. The Lycoming factory has a room that is impervious to vibration and loud outside noises. ). Lycoming specs their engine at 4 inches of water pressure differential minimum to cool properly. Jun 11, 2019 · This letter indicates that this valve should be replaced with the updated Lycoming veratherm / bypass valve p/n 53E22144 when high oil temp is noted. Left engine oil pressure is fine on start (mid-90s on cold start, quickly comes down to mid-80s), good on runup (high 70s to low 80s depending on ARE BASED ON CALIBRATED INSTRUMENTATION. Lycoming says the desired oil temperature with OAT in the 0 to 70 deg. Insufficient oil supply. control. John Deaking Min Take-off CHT Service Bulletins, Service Instructions, and Service Letters As advancements in technological applications on this engine continue, Lycoming will make future revisions to this manual. More information may be gained rather quickly by doing a compression check to locate any low compression cylinders. Additional details on break in can be found in the most current revision of Lycoming Service Instruction 1427. Lycoming's or Lyc clones like high oil pressure. The flow of oil through a Lycoming reciprocating aircraft engine is known to be a necessary function during the operation of the engine. PREPARATION OF ENGINE FOR INSTALLATION. Jun 28, 2021 · Much higher than that, and the oil and its additives might begin to break down. Oil pressure specs are 65-85 psi for normal operating range. Rough Engine Operation Low Power and Engine Runs Rough Low Oil Pressure On Engine Gage High Oil Temperature Excessive Oil Consumption Apr 23, 2013 · From the Lycoming overhaul manual: "9-23. A Lycoming IO-540 engine. Both Lycoming and Continental recommend a maximum oil temperature of around 245°F. That probably is not spelled correctly, but if you talk to your mechanic, he will know what you are talking about. The oil gauge was checked for accuracy, and the oil cooler was sent out, cleaned and checked. Jun 28, 2021 · The OH'd motor is running great, CHTs are down but oil temp is up. Any brand name lubricating oil in accordance with these specifications is acceptable for use; proof of such conformity is the responsibility of the lubricating oil Oil temperature indications should register on the aircraft gauge before takeoff is attempted so that problems associated with unusually high oil pressure will be minimized. The oil temperature is running about 200° on a cool day. Manuals and User Guides for Textron Lycoming O-290-D2 Aircraft Engine. Lycoming Engines recommends that engine owners and service personnel be in compliance with all federal, state, and local environmental regulations when solvents, paint, fuel, oil, chemicals, or other consumables are used in engine service. Sep 3, 2008 · HIGH OIL TEMPERATURE - Trouble shooting from Lycoming: 1. Aug 12, 2014 · At any rate the Lycoming engine operation manuals for 0-360 and 0-320 engines specify that the minimum safe oil quantity in the sump is 2 quarts. Apr 4, 2019 · For the Lyco-Saurus IO-540 drivers out there, what is your "usual" oil pressure for the following parameters: Idle at 1000 RPM engine cold (like 50F oil temp) Idle at 1000 RPM engine cold-ish (like 120F oil temp) Takeoff with oil temp at 180-200F Cruise with oil temp at 180-200F (2300 RPM) New engines have been carefully run-in by Lycoming and therefore, no further break-in is necessary insofar as operation is concerned; however, new or newly overhauled engines should avoid low power below 65%, during the first 50 hours or until the oil consumption has stabilized. Not really an issue with a 2700 limit. Check oil before & after each flight continue this until oil consumption stabilizes, which should be about 1 qt every 15 hours, plus or minus. I’d rather fail a valve than a rod, but high temps don’t just impact the cylinder head exhaust valve, heat is bad for a lot of other reasons to the head and other components. Make sure you are using the correct viscosity for the temperature, and the oil level is good. I'm wondering particularly for winter ops As a Lycoming customer, you have access to our worldwide team of authorized distributors and service centers. As oil goes through the engine, it usually sees a point in the engine where the oil is around 50° higher than the bulk oil going in. Running at 245° may be OK during break-in or during climb out, but I do not recommend running continuously at cruise condition at this temperature after your engine Jun 7, 2008 · We usually are very cautious about high oil temperature which we know is detrimental to good engine health, while a low oil temperature is easier to accept. New cylinders were used in the overhaul, the plane flys about 150 hours per year and always used Phillips XC For context: student pilot with about 55hrs on a first solo xc. As a Lycoming customer, you have access to our worldwide team of authorized distributors and service centers. ) or attempt to correct high or low oil temperature issues without verifying that the instrumentation is reading correctly. Oil cooler or lines plugged or partially plugged. Textron Lycoming Specification No. Improper grade of oil. IIRC the Lycoming minimum for these engines is 2 1/4 quarts. Everything I've heard from the owner/operator - TIME OF COMPLIANCE: During engine overhaul or earlier if oil leakage past the valve seat is determined to be the cause of high oil temperature. Also that oil temp gauges --especially the stock gauges with only the redline (225) temp marked on them -- are notoriously inaccurate. Lycoming strongly recommends that all engine instrumentation be calibrated annually. Jul 12, 2025 · High oil temperature is often a warning sign that your engine is under strain. I have plenty of oil ~11 quarts (12 max 8 min) of Aeroshell 15W-50 flying in about 80F degrees. (180-190 during break in with Aeroshell 100). May 29, 2017 · Q: I have a Lycoming O-320 engine that was overhauled by an IA who has overhauled lots of engines and, ever since, the oil temperature runs very high. trueAssume Lycoming IO-360 POH only states what is in the attached pictures, that if it idles at around 600 rpm and accelerates smoothly after 2-3 minutes minimum, it is warm enough. --checked All baffling new & good condition 3. A sudden drop of 15 psi should have required an immediate Jul 26, 2013 · Does the oil pressure drop at the high temperature? If yes, then temp is likely high. ‍ Several years ago we were shipped a freshly overhauled W670 that was experiencing high Dec 19, 2019 · The maximum cylinder head temperature allowed for continuous operation on most of the Lycoming O-540 series engines is 500°F. Regardless of the fuel metering device, fuel Jul 6, 2020 · By Paul McBride · July 6, 2020 · Q: I overhauled my PA-30 IO-360 fuel-injected engine five years ago. F. These are some of the more common questions asked at our service hanger: QUESTION: Do your new, rebuilt or overhauled engines require a break-in period that consists of cruise at low-power settings? ANSWER: Definitely not. Pilots and mechanics should know what weight, type and brand of oil is being used in the engine being serviced. Checkairflow to the oil cooler is good, oil cooler winterization plate is removed, no obstructions in ducting. High oil temperature a problem? It could be your vernatherm, or it could be physical issues (oil flow or cooler ducting) or electrical (like engine sensors or wiring). We're back to ashless and seeing 220 - 230 F on oil temp during splash and goes; 220 F during cruise (23 squared). Jun 16, 2008 · The Lycoming Operators Manual states the max oil temp for 540s is 245* F and recommends for max engine life keeping it between 165* and 200* in level flight, cruise conditions. During climb out/cruise the engine temperatures are in the green. Often these engines are low time since the most recent overhaul, so the high oil temps are unexpected. 1" MP, 2400 RPM, 2200 ft and at 75° F outside air temp the engine should produce 139 Hp on a standard day (HPs). Refer to the latest revision of Lycoming Engines’ Service Instruction No. I understand that preheating before start is recommended if the temps are much below 40F and especially below 20F, but after the engine is started, is there any specific Oil temp/pressure/CHT I should be looking Aug 27, 2012 · I'm experiencing an odd oil pressure issue with my Lycoming GO435-powered Twin Bonanza. Hence, the corrosion on my camshaft. No problem with oil pressure. All instrumentation for manifold pressure, engine RPM, oil temperature, cylinder head temperature, exhaust gas temperature, and turbine inlet temperature in the aircraft should be included in this annual calibration. From the oil temperature control valve cavity oil is directed to the camshaft passage. F, and in the 30 to 90 deg. ASHLESS DISPERSANT GRADES - This classification contains additives, one of which has a viscosity stabilizing effect, which removes the tendency of the oil to thin out at high oil temperatures and thicken at low oil temperatures. For best service life, from my personal experience, run the CHT between 380° and 400°. Lycoming generally sets the operating pressures for cruise rpm on their factory-rebuilt engines to between 75 to 85 psi. Personally, my limits are related to cyl wall temp, guessed at Lycoming Service Bulletin No. Dec 1, 1992 · A high or rising oil temperature has the effect of causing the oil pressure to decrease. Some angle valve sumps require a higher minimum oil level. Jul 21, 2019 · When max desired oil pressure is reached, say 85 psi, regardless of oil temp or engine rpm, the oil pressure relief valve comes into play and will bypass excess pressure as it was adjusted to do following engine manufacture or overhaul. Of course you can get the details from Lycoming or your engine builder. Break-In Operation of the TEO-540-C1A engine must be done with Ashless Dispersant aviation oil only. Using the wrong oil can cause high or low oil pressure. Jul 12, 2008 · Anyway - Continental recommends 30-60psi oil pressure and I've seen as low as 26psi before on the JPI - but the analog gauge doesn't show anything too out of the ordinary. Jun 7, 2013 · To support their claim they referred to articles by Bill Marvel and Bill Scott who claim that valve guide wear can be lessened by upping the oil pressure and that Lycoming won't admit this but has increased the max oil pressure on their newer engines to 90-95 range for the high. You just don't want to takeoff with the oil temp pegged at the bottom, wait for it to be in the green. But what is the low limit for operational oil temperature? When the engine oil temperature runs below 180°F, the condensation in the oil is not driven off. Engines equipped with a thermostatic oil cooler bypass valve have the location for connecting the oil temperature bulb beside the oil pressure screen (Figure 3) on the oil pressure screen housing. 50-hour interval oil change and filter replacement for all engines using a full-flow oil filtration system. Dec 12, 2024 · So what oil temperature should you shoot for? Water boils at 212°F, but you don’t need to run the oil temperature that hot. I replaced the Cessna guage with an overhauled gauge from Airparts of Lockhaven, and that gauge read slightly above the top of the green, so I was OK with that. Temp from metar was 27C I did my usual run-up and engine instruments was in the green (oil temp was right at the middle). If yoo would like it as a MS Word document, email me fod@bigpond. . Feb 28, 2016 · In my last several columns, I discussed some suggestions on oil temperature and oil change intervals. F range is 170 deg. F range is 180 deg. Applicable information from Lycoming Engines' Service Bulletins, Service Instructions, and Service Letters are included in this manual at the time of publication. This revision of the Service Instruction identifies thermostatic oil cooler bypass valve P/N 53E22144 (Figure 1) (or other superseding bypass valve identified in the latest revision of Service Instruction SI-1565) as a superseding replacement bypass valve for either bypass valve P/N LW-10269 or P/N 75944. Feb 9, 2011 · Ask Paul: What’s up with my oil temperature? By Paul McBride · February 9, 2011 · Q: I’ve been having trouble with my Lycoming O-360-AIA engine for some time. Jan 18, 2012 · Is there an recomended oil temp we should try to obtain before take off? Mine is a O-360. using improper grade oil from prevailing ambient temperature. net. This strikes me as abnormal for an IO-320 equipped with an oil cooler. Insufficient cooling air. Lycoming says: The Engine is warm enough for take-off when the throttle can be opened without the engine faltering. Most new, rebuilt or overhauled engines require a slight adjustment of the oil pressure to finalize the setting once the engine break-in process is complete. Assuming you have an accurate way of measuring it, there’s good reason to fret about high and even low oil temperature. Sep 10, 2017 · Since my engine overhaul back in 2015, I have noticed that the oil pressure is pegged to the right (above 100psi) in my 81J and oil temp is sitting between 165 to 170 during cruise. May 13, 2016 · Supersedes Service Instruction No. Aug 8, 2013 · The Lycoming Operators Manual states the max oil temp for 540s is 245* F and recommends for max engine life keeping it between 165* and 200* in level flight, cruise conditions. Discover the Engine Oil Temperature Chart with ideal oil temp ranges, effects of overheating, and maintenance tips for optimal engine performance. Jul 15, 2010 · My engine consistently runs hot - 220 and above. I don’t want to lose an engine, no one does. The peak temperature in a turbocharged engine is about 70 to 75˚ F hotter than the indicated temperature. REASON FOR UPDATE Updated lubrication oils and temperature ranges. Aug 6, 2020 · You mentioned the #3 cylinder EGT temperature will read 1,470°F during the flight profile you mentioned. Mar 22, 2022 · Other possible issues could be engine cooling baffling age, condition and how well sealed is it inside the engine cowling. 25-hour interval oil change and screen cleaning for all engines employing a pressure-screen system. I would consider sending it out for cleaning / overhaul as a last resort. We frequently flush oil HX with fuel to clean them. Ambient temp was 65 degree F. This manual is intended for use by owners, pilots and maintenance personnel responsible for care of Lycoming powered aircraft. Jul 23, 2014 · On a normally aspirated Lycoming engine, the hottest oil in the system is typically about 50°F hotter than the oil in the engine oil sump. Engine operating temperature is another item that is not usually given enough consideration in cold weather. The desired oil temperature range for Lycoming engines is from 165˚ to 220˚ F. 1014M DATE: July 29, 2020 MODELS AFFECTED All Lycoming opposed series aircraft engines. Fly them as you would a high-time engine. Such maintenance procedures that may be required in conjunction with periodic inspections are also included. Therefore, the CHT that you’re seeing of 395°F is well within those limits. Jun 11, 2012 · Monday, June 11, 2012 High oil temperature on Lycoming aircraft engine I don't have a canned solution except to suggest a process: An interesting thing about Lycoming engines -- the oil cooling system is mostly external to the engine. Jan 11, 2010 · The back 2 cylinders hit 460 degrees, and the oil temp red-lined--yet OAT was only about 82F. Any new service information will be included in New engines have been carefully run-in by Lycoming; therefore, no further break-in is necessary insofar as operation is concerned; however, new or newly overhauled engines should be operated on straight mineral oil for a minimum of 50 hours or until oil consumption has stabilized. The normal electron flow is from airframe ground into the engine case, into the sender's threaded end, out of the sender's terminal, through the wire to the gauge's sender terminal, out of the gauge's + terminal to the bus and then to the battery +. 2 May 8, 2008 · I've seen the oil pressure range that Lycoming publishes. In addition, higher oil temps are common on angle valve and custom Lycomings that have piston oil jets installed as more heat is extracted through the oil in those engines. The latest revision to Lycoming Service Instruction 1014 gives recommendations for lubricating oils, oil change intervals and engine break-in. In fact, so-called “slow” flying may have harmful effects. 1. You can only use Feb 24, 2020 · Oil Pressure For parallel valve engines with standard sump 6 qt oil level will have no effect on oil pressure. Lycoming told me what the numbers are when I was troubleshooting this issue on a cessna 172. Jul 18, 2019 · High oil temp readings with electric gauges are often due to poor engine-airframe grounding. If we bring throttle back to 700 RMP it will cool down again to 215-220F. After this period, a change to an approved additive oil may be made, if so desired. Mar 21, 2012 · Cessna had this issue with its Rochester electric oil temp kits used to replace the old bulb-type mechanical gauges and had to start providing a ground wire to be installed between a case bolt near the probe and the gauge frame itself. Plus digging around the oil diagrams over the past two days it looks like the oil temp sender measures oil temps before it gets routed through the engine, which would mean after the oil cooler. However, if more timely distribution is necessary, Lycoming supplies up-to-date Service Bulletins (SBs), Service Instructions (SIs) and Service Letters (which are abbreviated with a capital “L” followed by New engines have been carefully run-in by Lycoming and therefore, no further break-in is necessary insofar as operation is concerned; however, new or newly overhauled engines should be operated on straight mineral oil for a minimum of 50 hours or until oil consumption has stabilized. The head temperature is in med green. The art of troubleshooting with an engine monitor is a subject that’s so rich and fascinating that I’m in the process of writing a book about it. High temp means hotter engine and hotter engine means lower oil pressure since it gets thinner with heat. Excessive internal engine clearances due to excessive wear or a bearing failure can become so great that the output of the pump is insufficient to fully pressurize the oil system. If the pressure under normal operating conditions should consistently exceed the maximum or minimum specified limits, adjust the valve as follows: Aug 14, 2022 · We usually are very cautious about high oil temperature which we know is detrimental to good engine health, while a low oil temperature is easier to accept. It's fresh out of its annual--this was also the immediate post-maintenance flight, but the only major thing done this time was to R&R the prop after having it resealed. Is this temp and oil pressure normal for the breakin period of the engine? Kind of leary to fly it again at that low oil pressure. I would like to address this with a few things that we have discovered. Yet, not all low oil pressure incidents result in oil starvation. In these engines, you should NEVER use automotive or heavy duty truck oils. It takes about 15 minutes - regardless of ambient temperature to Steve, I've been seeing the high oil pressure since I've owned the plane, about 9 months and 40 hours ago. Jun 30, 2025 · Most pilots use the 225°F temperature as their red line high limit. snhw upqqdzd jdzfi mvbq ibri oblwcji cmt xyrn dzftq kzya