Cummins isx injector cups leaking. Injector 1, 3, and 6 are the ones that failed leak test.

Cummins isx injector cups leaking My question is, can the fuel pump send fuel to the oil, or could a cracked cylinder head cause this? Mechanic's Assistant: What is the complete model and serial number of your machine? Customer: The engine model is 4 days ago · Rawze. I've had and heard of a very high success rate doing it this way. Injector sleeve repair for Cummins X15 diesel engine. Feb 18, 2013 · First question is how hard is it to pull injector cups out of a 2005 5. Premium quality, fast shipping, and in stock. found a leaking injector harness throwing a fault. Had this hit come in with fuel in the cooling system. Re-seat or replace faulty injector cups to restore correct compression and fuel delivery. If there is one leaking, ensure that you install retaining rings in all the other cylinders as well. By Cummins standards the cylinder head needs replacement, but with some patience, proper tooling and knowledge the injector cups can be replaced Injector sleeve seal leaks can be verified in-chassis by pressure testing cooling system with injectors removed and monitoring upper edge of injector sleeves for bubbles or coolant leaking into injector bore. Coolant level is dropping slowly. 96K subscribers Subscribe Sep 27, 2011 · On the Power Stroke engine, the injector seats inside the injector cup. Replace the injector o-rings and reinstall the injectors, tightening them to reseat the injector cups at 59 ft-lbs Nov 19, 2021 · Why do you think you have a leaking injector? Leaking nozzle, 2 tests. com: Rawze's ISX Technical Discussion and more / Big Truck Technical Discussion / ISX Related Help / ISX15 CM2350 injector cups The replacement of the lowest injector o-ring must be completed on all injectors. smells like raw fuel out exhaust. What do you do to avoid that from happening? How do you know the injector/injectors are a problem before the engine is trashed? Seems to be a fairly common problem and no safeguards - which makes owning a diesel - which should be a troublefree truck a Diesel injectors are crucial components of Cummins ISC, ISX, or ISB engines, directly impacting vehicle performance. Injector 1, 3, and 6 are the ones that failed leak test. It isn't even that big of a job so it's worth a try. Certainly, there’s some common repairs needed on specific engines that are easy to do but doesn’t mean that it makes Dec 5, 2022 · 2011 - 2023 6. 00 USD In stock I have a Cummins ISX 15 CM 2250 that is leaking a small amount of coolant into oil and burning it through exhaust as well. The AERA Technical Committee offers the following information regarding injector sleeve leak repair for Cummins ISX15, X15 & QSX15 engines. It’s pushing coolant into the fuel return, and it’s getting returned to the tank and sucked back up, and caught by the separator filter. Tamerx Cummins ISX15 Injector Cups : OEM 3686961 is built for 2011-2016 models. Got everything reinstalled, overhead set has been adjusted per spec. How to install ISX Torque Lock Injector cups on a cut away of a single overhead cam Cummins engine! Jul 11, 2012 · Injectors go bad and destroy an engine. LOTS OF SMOKE. That means they’ll need to be serviced. Had it scanned and injector number 3 Mar 9, 2012 · Search this forum Printer friendly version E-mail a link to this thread Sure, here is the procedure from Cummins on resealing the cups. Cummins I have an ISX with what looks like a cracked injector cup. Mar 31, 2025 · Cummins injector cups are vital parts of diesel engines, playing an important part in optimizing their performance and efficiency. 8K subscribers Subscribed Customer: Hi, I have a Cummins ISX. However, like any piece of machinery it requires maintenance and occasional repairs. (03-01-2017 )race7820000 Wrote: [ -> ] 500 mile day it pushes out around 2 gal T680 often faces injector cup seal leaks causing coolant contamination and injector cup failures. Checked the running clearance of the engine brake rocker with it at detent. Apr 4, 2022 · Injector cup repair is usually only a 50/50 shot at best in a cummins head from what most people have seen. Had to install retaining rings in the injector cups. In this comprehensive guide, we’ll explore common symptoms, causes, and troubleshooting . Cummins x15 head replacement for leaking cups TAT Express Inc. com: Rawze's ISX Technical Discussion and more / Big Truck Technical Discussion / ISX Related Help / Cm870 advise needed Shop with Blessed Performance for the Industrial Injection Cummins ISX/QSX/X15 Torque Lock Injector Cup Kit. This causes injectors to dribble fuel until the rail empties, resulting in diesel knock and erratic timing. Usually if it's injector cups you'll be making extra coolant due to fuel entering the coolant system. let me know what you Dec 1, 2012 · replacing fuel injector cups on 2002 ISX 450 Discussion in ' Trucks [ Eighteen Wheelers ] ' started by Crazy Alex, Nov 17, 2015. 9L Cummins engines, they’re still a wear item. 7L Engine Injectors Pumps Turbos Quick shopAdd to cart PowerStroke 6. #diesel #mechan 3 days ago · Rawze. 9L Cummins is a simple visual test. Not familiar with the ISX but I assume coolant and oil pass through the head gasket, so possible head gasket issue or cracked head? They pull the pan and oil filter, then pressurize the coolant system in order to see where the coolant is leaking. The Industrial Injection Torque Lock Injector Cup Kit is the proven solution for one of the most common failures on Cummins ISX15, QSX15, and X15 engines: leaking press-fit injector cups. This failure is the motor killer Leaking cracked injector body, same as Feb 22, 2012 · One method to track down the damaged injector on a common rail 5. The cups will leak if an injector or dummy injector is not installed to properly pressure check. com: Rawze's ISX Technical Discussion and more / Big Truck Technical Discussion / ISX Related Help / Fuel in Coolant, Cummins TSB170004 Customer: I have a 2015 ISX 15 Cummins with fuel in the oil. Can the cups be replaced without removing the head, or is it possible to install a retainer seal? As others have suggested, it’s a cylinder head problem, either a crack, or pitting around the injector cups. Machine shop replaced Cam Bearings and did all normal pressure checks, cleaning etc. Start truck and rpm jump and rail psi 10k. Appears to be going through exhaust. Are these removable? If so what is the removal procedure ESN-79143527 Nov 14, 2025 · Rawze. Where else could this leak be coming from? May 22, 2019 · Hello All, Need some assistant I have 2004 International 9400i with a CM870 Cummins ISX motor. Reference Procedure 002-014 in Section 2. com/shop/r Mar 14, 2012 · Brilliant mechanics these days. com -- Injector Leak Test for the CM871 engine by Rawze. Just need the injectors out and the rocker shafts removed. The most common cause of this is Injector Cups. Sep 4, 2014 · Leak Test This test checks for combustion gas leaks back through the injector rail check valve or other conditions that will allow gas leakage through the injector into the fuel rail. Just helping another driver find out why his engine is running poorly. cheaper than pulling the head for no reason. Since injector cups were banded and tested leak-free, focus on the HP fuel pump and cylinder head gasket integrity. Jul 31, 2025 · In Cummins engines like the ISX and QSX series, the injector cups are often pressed or brazed into the cylinder head and require precise fitting. I just installed injector cup rings because the cups were leaking antifreeze into the fuel. You can smell the coolant on passenger side of engine as well. A bad injector cup seal can allow fuel to leak into the coolant passages, contaminating the coolant. The injector cups have already been shimmed with the retaining ring approved by the manufacturer. Feb 22, 2017 · I didn't mess with anything but the injectors them selfs and the cups didn't look like they were leaking. We are Customer: I have a 2004 Cummins ISX15, and the dual cam injector cups are leaking coolant into the fuel. Under oil filler cap there is a small amount of white milky oil. com: Rawze's ISX Technical Discussion and more / Big Truck Technical Discussion / ISX Related Help / Injector leak test Feb 28, 2011 · Search this forum Printer friendly version E-mail a link to this thread Injector sleeve seal leaks can be verified in-chassis by pressure testing cooling system with injectors removed and monitoring upper edge of injector sleeves for bubbles or coolant leaking into injector bore. With the valve cover off looking for some signs of a “wisp” of smoke, being careful not to mistake blowby for smoke. I replaced the O-rings on the injector and had a code for fuel rail pressure. Reference Procedure 006-026 in Section 2. For removal and replacement information as well as maintenance concerning injector o-rings, see corresponding Service Manual. 0 Stock Fuel Injector 2004-2007 $21995$219. This only works on CM2250 and 2350 engines. 95 "Close (esc)" Heavy Duty Mar 1, 2020 · Cummins sell a tool that installs injector cup retainer/crush rings in the head while it's still on the engine. Fuel/coolant cross-contamination on a CM570/870/871 is only ISX CM871 Injector Cup Removal Without Head Removal Injector cup damage during removal and difficulty accessing injector cups without removing the cylinder head. Time to pull your injectors and see what's going on. Customer: I have an ISX 15 engine, and I'm experiencing coolant mixing with the fuel. It has been reported that when pressure checking these heads some injectors sleeves might show signs of leakage. 3 days ago · Rawze. What are Injector Cups? This video describes what Injector Cups are, how to replace them, and why there is fuel in you coolant. Also have a starting problem. One repair that may come up is leaking injector cups , allowing coolant to enter the fuel system. Installed into the cylinder head, these cups serve as seals between fuel injectors and engines and have several primary functions: Sealing the Combustion Chamber: Injector cups create a tight seal to prevent fuel and coolant leakage into the combustion chamber, a Cummins ISX CM870 Injector Cup Leak Repair Guide CM870 often faces injector cup leaks and injector seal failures causing fuel seepage and performance loss. Jan 30, 2023 · Had cups replaced Cummins isx15 Discussion in ' International Forum ' started by Bamatrucker123, Mar 17, 2023. Inspect the injector cup seals for cracks or wear during maintenance. A retaining ring can be installed without removing the head for this repair. Bad JuJu if above 2% on well used oil. If they are indeed leaking, the head should be replaced; otherwise, according to Cummins, the injector sleeve may be leaking even without any visible defect in the injector o-rings. The Billet Torque Lock Injector Cups are designed to thread into the cylinder head creating a locking bond between the cup and the cylinder head. Apparently 2 different Kenworth dealers could not find out 5 days ago · Rawze. #cummins #isx #cumminspower #semi #semitruck #kenworth #peterbilt #freightliner #inte 4 days ago · Rawze. High pressure fuel surrounds the injector which, as we’ve discussed, is sealed by the rubber O-rings. Head gaskets don't usually fail on their own, it's generally a cracked head, or a sunk liner. Vehicle had an engine oil leak at rear of head gasket. Oct 1, 2021 · Despite how durable the mechanical fuel injectors are in the ’89-’02 5. Injector cup leaks in the CM870 typically stem from worn or damaged injector cups seated in the cylinder head. It sounds to me at this point that you are fighting against the inevitable, unfortunately. Regularly monitor coolant and fuel quality to prevent cross-contamination and maintain engine performance. 9. Rawze's Amazon Recommendations: https://www. amazon. I would definitely check the nitrate levels in Injector cups on an isx 2350 wont always be the fix but worth a shot!! NUT-N-BUT ISX 8. com: Rawze's ISX Technical Discussion and more / Big Truck Technical Discussion / ISX Related Help / cummins isx injector Nov 14, 2018 · Either the injector is leaking cylinder pressure at the copper sealing washer or the injectors are leaking fuel pressure from the injectors joint . I found the cups (sleeves) leaking. Verify timing Tamerx Cummins ISX Injector Cups : OEM 3412352 is built for durability. Replace faulty seals promptly to prevent engine overheating and coolant Excessive combustion pressure in the fuel system can stem from poor injector cup-to-sleeve seating on rear cylinders. new rail and all sensors, no Customer: Dr. Apr 5, 2024 · The ISX15 is renowned for its durability and performance. com: Just helping someone to replace a bad injector that we found on his ISX CM871 engine. Sep 22, 2018 · The dreaded mysterious coolant lossCummins isx injector cups leaking in the act What's up youtube Family, I had a code spn 653 pop up on my last trip, it showed a mechanical fault for injector number 3. The fuel water separator is not affected by the coolant, and the fuel tanks are also not heated by it. I did an update on the fuel pump, and now there's fuel in the oil. My 2006 ISX with 330000 miles head gasket was leaking at the left rear corner and I have been told some has this problem, so when the shop was checking the head over they thought one injector cup showed signs of leaking, I had run oil sample but nothing in the oil, on my old cat 3406E they could do injector cups with head on but the shop talked to cummins and no one has the tooling to do this How To Replace Injector ISX Cummins Stevens Truck Power 9. The gap is few thousands greater than the numbers I have here, didn't want to spend a lot of time to find the exact gap just wanted to see if it was greater than the minimum limits and Jun 22, 2022 · How to fix the Cummins ISX/QSX Single Cam issue where coolant mixes with your fuel. Rawze. 9K subscribers Subscribe Removal and installation of fuel injector sleeves on Cummins ISX SOHC. Inspect the injector cups and sleeves for proper fit and sealing. I took it to the shop, and all the injector O-rings were replaced, but it's still sending fuel to the oil. 7K subscribers Subscribed ISX Injector Cup Permanent Fix Industrial Injection 30. There's a few potential causes for coolant disappearing without a visible leak. Oil levels are not increasing though. Hard to tell which is which without removing the head. Removed Cylinder head, had head sent out to machine shop and had head inspect etc. Inspect the HP pump for coolant traces and replace if faulty. After injectors are installed, a leak check must be performed. . Coolant apparently leaked from the hose and got in position around the injectors and the bubbling faked you out. It's important to keep the fuel pass-through connecting tubes with each cylinder injector that you remove. See corresponding Service Manual. Mar 12, 2023 · So I've never messed with injectors but I have one that's leaking externally from where it goes into the cylinder head and also my truck is hazing more than normal What do I need to buy as far as seals or washers for this and also I might want to go ahead and just re seal all off them and Rawze. Apr 6, 2017 · ISX CM871 Oil In Coolant Discussion in ' International Forum ' started by CraigInReston, Apr 17, 2022. changed nozzles and put another set of injectors in, still no help. You’ll smell a hint of diesel fuel as well. If you’re dealing with coolant in fuel on your Cummins ISX15, the root cause is often a loose factory press-fit injector cup. It was leaking fuel into the oil pan. 326K subscribers Subscribe 20204 - Fuel Injector Sleeve Ring Installer Kit - Cummins ISX, QSX & ISX 15 $308. Truck Repair, leaking coolant though injector sleeves Kenworth t680 isx15 Cummins 2020/165 LongHaul Larry 23. Bosch injector lab test at max fuel psi and high heat for nozzle leakage higher leakage rates with show in oil lab test for diesel contamination in crankcase oil. Conduct a cylinder leak-down test to check for gasket failure. com: Rawze's ISX Technical Discussion and more / Big Truck Technical Discussion / ISX Related Help / ISX15 CM2350 injector cups Oct 21, 2016 · Here are the results, I'm pretty sore from barring the engine over last night. Since the fuel pressure is greater than coolant pressure, a leaking injector cup would cause fuel to seep into the coolant system. Recognizing symptoms of injector failure, understanding underlying causes, and implementing effective solutions are essential for maintaining engine health and optimizing performance. xgwqa bzhgyyxb hvxhx ijcjo gtvjlbm gnjz shgxcxdr fvtnq myfox ezap vinjr cnnr mrgjbh rkzu lacfm