6.0 mystery oil leak

[MIbowhunter]

So I've completely bulletproof the engine in my 2005 6.0, FICM, oil Cooler, Coolant filter, blue spring, egr ******, heads, studded etc. Truck runs great with borderline injectors (working on that soon). I noticed after a long trip north (3 hrs), the next day I have oil under the truck about the size 3" in diameter. truck has 175K miles on it. Seems to leak for a bit then stop and doesn't do it again until driving it a while. All the pressure gauges, and scan gauge read great. I have powerwashed/degreased underneath the engine, wiped with a shop rag, etc to try and locate it. It has barely a drip on the bell housing and starter/lines. Followed it up looks to be a valve cover gasket but when I had the oil cooler changed, mechanic stated it was the oil cooler gasket (cheap Dorman was on there). and he didn't see anything from the top like a valve cover etc. so... not sure if this is just additional run off from when the gasket was leaking or something entirely different. :wtf: Turbo return is new as well. HPOP is good with 3800 PSI (tested). Wondering if it is a rear main seal or??? Also looks like a little from the front just behind the fan like the low pressure pump???? anyone have this or any of you diesel mechanics have any ideas?? thx

 

[bismic]

The glow plugs can leak. So can the cam and crank sensors. Could be a gasket leak on the oil cooler. The leaks all end up on the bell housing.

 

[MIbowhunter]

glow plugs and harness' are new along with the oil cooler and gasket. I have heard about the sensors as well as the back plate. still looking. Where would the sensors be located?? anybody else have any clues?

 

[sootie]

Check the driver's side rocker box oring. If cab-on work was recently done, the mid/lower back bolt could be missing. It's very easy to miss being that you can't see it.

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[webb06]

Check around hpop cover where it meets the rear cover as well. Should be a dab or silicone there but if not it could leak.


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[MIbowhunter]

Thx. Not familiar with the rocker box oring can you explain a little more please? I will try to check the HPOP cover not sure if I can get in there. suggestions?

 

[MIbowhunter]

i power washed the too valley where the hpop cover is etc. bow it’s spotless. so.. the drip is about a quater in size after some time and i’m thinking its the back of the valve cover . if it is, im getting the injectors done next spring so.. anybody else have ideas?