hi I got a 05 6.0 that came to the shop and it is mixing the engine oil with diesel fuel I already changed the injector orings nipple orings and still have the problem any ideas would be greatly appreciated thanks

 

Did you do the top Injector o-rings?

Here is one we had in the shop back in march ...

https://www.ford-trucks.com/forums/1...-you-guys.html

 

when you say top injector oring you mean the one where the oil rail nipple goes right

 

Time for a injector leak test. Sorry, got my tests mixed up

 

How do I do an injector leak test?

 

Pull the valve cover and flip the key on so the fuel pump will run. Don't crank it over. Or if it's an option on your diag equipment, command the fuel pump on. If you watch the video Runs-wifey posted above you can see what you'll be looking for. Fuel leaking from the offending injector(s) will be visible.

 

Oh Ok thanks I already did that test no fuel leaking there any other troubleshooting I can do?

 

Were getting to the limits of my skill/experience level here but the fuel supply is separated from the crankcase until it gets past the banjo bolts on the front of the cylinder head, so the leak would have to be after that point (somewhere in the cylinder head). The fuel supply passages are cast (machined) through the head to the injector cup area. So if the fuel isn't coming up from around the injector and mixing with the oil there, it may be leaking into the cylinder around the injector cup and then around the rings into the crankcase. I think I have read a cracked head can leak fuel into the oil system as well. Short of pulling the heads to visually inspect, if a bore scope is available, inspecting for an unusually clean piston/combustion chamber or fuel puddling in the piston may shed some light on the subject.

Hopefully one of the Techs check this thread and offer some more specific info for you.

 

Thank you very much Rusty I would check with a borescope and see what I find

 

The other way that Anthony (run6.0run) Julie's hubby came up with would also work.
It involved draining the oil and then placing a catch pan under the open drain
and running the pump. The to isolate sides ha had a block-ogg tool he made
so that he could pressurize only one side of the fuel system at a time.


Sean

 

You got it Sean,,, that's the test Julie was referring to. Guess she should've been more clear. If you drop the oil,, run the pump,, and no fuel,, then you don't have a leak. Otherwise,, you didn't wait long enough with the pump running.

 

Negative---- That would be the air test,, that test has nothing to do with fuel.

 

Hey jtec! Have you made any progress with this?

 

I'm doing the air test right now, I'm getting air coming from the 2 oil return holes on the injectors is this normal?

 

just bumping the thread to see if anybody has any ideas thanks