2003 F350 6.0l oil leak
 

I have a 6.0l that is leaking oil and I'm having a tough time locating it. It is leaking somewhere at the rear of engine but the odd thing is that it only leaks after the engine is shut off. Running, no leaks but shut it off and a few minutes later there is a good size puddle. I've removed the turbo assembly to include the bracket and it is fairly dry. The rear of the heads are wet but would that leak after shut down? Any help would be great.

The early 6.0s are notorious for a leaking ICP sensor, it is the small sensor that is on the cast iron cover at the rear of the valley, that cover is over top of the high pressure oil pump for the injectors. just look on the driversside of that cover, there might be a heat sheild blocking part of your view, either push it out of the way or unbolt it,normally with the degas bottle out and FICM removed it is pretty easy to do. Good luck

Thanks for the information, I will check that out first thing in the morning.

Well the leak appears to be coming from the high output pump cover. Just puzzles me how it will leak that much oil after the engine is off and nothing while running. I'll put it back together and hope for the best.

You park the vehicle facing up hill?

I did while it was running but to also allow the water to run off after I steamed cleaned it. The oil didnt start to leak until after I shut it down and was on a flat surface.

its the ICP sensor, it is common.

I'll check that, thank you.

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What type of RTV would you recommend for the back of the HP oil pump cover? It is my understanding that I should apply some type of RTV on the back corners before reinstalling.

either Black or Copper, clean the surface with some brake clean first

Ok, got it back together and fired up straight way. Oil leak is gone however I developed a coolant leak at the blue connector between the EGR cooler and oil cooler. Darn pin hole. Now to replace it.

Glad it worked out for you,,,pinholes suck

Was it a bad idea to put Lucas stop leak in the 6.0l? Vehicle ran great after all the work I did, then all of a sudden it died and will not start again. Similiar symptoms to my no start last year with the HPOP.

I would double check all your connections, especially on the FICM, something might have not been on all the way then popped loose

What kind of reading shouild I get through the ICP? My scanner is showing just under 600 while cranking.

What's IPR duty cycle?

Also you need to check desired ICP against actual ICP, and compare those two. As long as they're close to each other, and IPR duty cycle isn't spiking up way high, you're probably fine.

580 sounds close to normal for idling, not sure about actually cranking, but again, more importantly we want desired and actual close... Check those and get back to us.

If I remember right, you need to see at least 500psi for the truck to fire so you should be allright as far as the ICP,

How can I check the IPR duty cycle? My scanner doesn't read it. Can I have a stuck IPR and not trip a code?

Usually if there is an issue, IPR duty cycle will spike up towards 75% or more maybe. Normally it's down around 25%. What scanner are you using? If the IPR was "stuck" you'd be having other issues. You can always pull the IPR and give it a good cleaning.

We have a Solus Pro by Snap On. I didnt see anything under the data screen that would reference an IPR reading. I'm going to pull the IPR now and check it however without the special socket I may need to pull the turbo again. My initial problem was oil leaks so I fixed those and sent the truck out. I also through in some Lucas stop leak and wonder if that caused my problem. Anyway, three hours later it would not start. Cranks very strong and sounds as if it wants to fire but won't. I did an injector buzz test, as well as check for fuel and also check all my grounds and connections.

It's quite possible the stop leak is doing something... There's no way I'd put anything like that in my truck. I can't imagine what something that is supposed to form a seal and stop a leak would do to injectors that are fired off of this same oil. :humm:

Trust me, I'm regretting that particular move.

Try changing the oil and putting some Rev-X in maybe?

Ok, so I pulled the IPR and found a small piece of plastic lodged in the screen. The screen is somewhat collapsed now with a hole in it. I'm guessing the plastic came from the filter housing tube. Last year a replaced it because the relief button on top was broken. I guess I will by another IPR and see if that corrects the problem.

Ok, the plastic was actually a piece of "O" ring logged into the IPR. I removed the HPOP and found the "O" ring under the pump was coming apart. Back together and running now. Thanks again for all your help and suggestions.

HPOP was a bad idea for these trucks, just too many problematic things can go wrong

It is and it isn't. HEUI is a work of art in it's own regard, but they can and do have problems. I'd rather have an oil leak and the truck not run great than have a commonrail and worry about an injector sticking open and the CP3 filling my motor and burning a hole in the piston. Far cheaper to replace a couple o-rings than it is to rebuild a motor.

HAHAHA 6.4=doom.

all they had to do was make the stand pipes thread into the branch tubes or run external lines like the 7.3 had to each head...

HEUI is not only used by ford/navistar theres a few big rig engines that use it...
And theres a reason why our remanned injectors are being rebuilt by cat...