sdv4x4 Posted September 1, 2015 Share Posted September 1, 2015 I got a 6.4 with a high oil level. HP fuel pump was all ready replaced at another dealer for same concern. seem to take care of it for a few months. Now I got it with the same concern. drained 22 qts out. ran hp fuel test many times, passed. removed both valve covers and ran HP fuel test many times, no leaks anywhere. Even added dye to fuel, resealed injectors and replaced supply lines for good measure. reassembled, marked dipstick, cust brought back a couple days later, oil level climbing again. Hotline said try another HP pump. replaced pump, changed oil and noted level. We drove it many miles without giving back to customer to rule out any tampering, after a few hundred miles.....oil level starting to climb. and it passes the IDS HP fuel test with flying colors everytime. Quote Link to comment Share on other sites More sharing options...
8WA Sman Posted September 1, 2015 Share Posted September 1, 2015 Info I would probably look at... relative compression results, injector short term fuel trims,the way it runs with the injection correction disabled, & regen frequency. Quote Link to comment Share on other sites More sharing options...
lmorris Posted September 1, 2015 Share Posted September 1, 2015 Run a crankcase pressure test as well. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted September 3, 2015 Share Posted September 3, 2015 It is amazing how well this engine's PCM can compensate for base engine problems... and when the problem finally presents symptoms it is often too late. Quote Link to comment Share on other sites More sharing options...
blown99 Posted September 6, 2015 Share Posted September 6, 2015 Check #2 and #8 closely. Perform relative compression test, manual compression test and check the blow by for unevenness.Blow by can be in spec even with a bad cylinder. Quote Link to comment Share on other sites More sharing options...
ktmlew Posted September 7, 2015 Share Posted September 7, 2015 Check #2 and #8 closely. Perform relative compression test, manual compression test and check the blow by for unevenness.Blow by can be in spec even with a bad cylinder. He is looking for bent connecting rods, right? Quote Link to comment Share on other sites More sharing options...
cbriggs Posted September 9, 2015 Share Posted September 9, 2015 Any of these I have had have all been leaking injector bodies. If it was a truck that had the injector recall way back when, look closely at any injectors that didn't get changed. I know its tough on these, but get her good and hot, then rip the covers off, so the engine is still quite warm, then run up hp fuel pressure with dye in the fuel. Quote Link to comment Share on other sites More sharing options...
Kevin_Rymwid Posted November 2, 2015 Share Posted November 2, 2015 I've had a few with high oil levels, all happened to be due to regen failing to complete, just kept pumping in more and more fuel and filled up the crankcase Quote Link to comment Share on other sites More sharing options...
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