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+--- Thread: EGR Cooler Leak Check X15 (/showthread.php?tid=10350)
EGR Cooler Leak Check X15 - Hermjeji - 10-13-2025
Hi Folks,
Long time since i've posted on here, been occupied with some complementary business expansion and family life. But have been lurking
Ive got a X15 CM2350 X116B from 2017. It's got 18,000 hours on it, hauls heavy at ~60,000 kgs. Bought the truck used 5 years ago, and its been demandated by folks from this forum for the last 2 years now. Excessive coolant consumption at about a gallon every 2 days, fixed all external leaks. I've sat the truck now and have some time to do some trouble shooting.
1. When the truck is turned on, coolant level drops, and then when the truck is turned off coolant level returns to normal.
2. EGR cooler was replaced almost 6 years ago.
To do the test on this model EGR cooler, I want to confirm what I remove before I complete the 20PSI pressure test.
Is it just this clamp on the outlet side of the EGR i need to undo and place a dish under?
https://imgur.com/a/wYkhqfMThere's also an entire coolant strip test procedure on quickserve now, but with it being demandated, doubt that will do any good. https://quickserve.cummins.com/qs3/pubsys2/xml/en/procedures/453/453-011-019.html?q=egr%20cooler%20coolant%20return%20tube
There's some blowby evident as well, but I figured I would drop the pan after ruling out the EGR cooler.
RE: EGR Cooler Leak Check X15 - marek4792 - 10-13-2025
With the hours it has, I think its time for inframe. Most likely a liner has sunk or an injector cup is leaking bad enough to push coolant out through the overflow. To be sure drop the oil pan and pressurize the system overnight and then bar the engine over to check if coolant is escaping between the piston and liner and/or liner and block.. Air compressor can also push coolant out too so make sure to rule that out too.
RE: EGR Cooler Leak Check X15 - Rawze - 10-13-2025
remove that pipe, yes, to ensure it is not the egr cooler... but also drop the pan ...
info: https://rawze.com/forums/showthread.php?tid=9750&pid=81814#pid81814
18k hours (equiv to 890,000 miles) is decent lifespan for an X15 that works hard. Its most likely a head gasket at this point.
here is what extra things that are needed if it needs inframe:
https://rawze.com/forums/showthread.php?tid=8105&pid=70606#pid70606