Diesel in crankcase
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Senior User
Joined: Oct 2009
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From: Maple Valley, Wa
Diesel in crankcase
So I'm currently going through a nightmare of problems with my 7.3 but my main question right now is if injectors weren't seated properly when installed (its the last thing i had installed) could diesel somehow leak into the crank case
Posting Guru
Joined: May 2006
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From: Milroy, PA
You probably have a cracked injector cup then. But before you can say that for sure, you could pull your injectors carefully, and inspect the o rings. If one is torn, more then likely it was that. But if they all look good, good change you have an injector cup that is cracked. That should be the only place for the fuel to get into the oil, other then rings. But you said before this nothing was wrong. When you re-installed the injectors, did you lube the o-rings with either oil or vasoline?
Posting Guru
Joined: May 2006
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From: Milroy, PA
Isnt that more of a headgasket thing? (oil in the coolant) Im pretty sure coolant doesnt go through any part of the injector? And the injector is seated into the cup. Please correct me if I am wrong. Because its not computing in my head at the moment.
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From: independence,mo
i would try to dye your fuel and run the engine, then use a uv light to check for leaks around the injectors. at work we use a pump to connect to the inlet side of the head and plug the return line, pressurize the head and check for fuel leaks around the injectors. hopefully someone on here has done this on a 7.3 or can help you out more on setting one up. good luck
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Postmaster
Joined: Jul 2006
Posts: 4,993
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From: Bend, OR
You probably have a cracked injector cup then. But before you can say that for sure, you could pull your injectors carefully, and inspect the o rings. If one is torn, more then likely it was that. But if they all look good, good change you have an injector cup that is cracked. That should be the only place for the fuel to get into the oil, other then rings. But you said before this nothing was wrong. When you re-installed the injectors, did you lube the o-rings with either oil or vasoline?
To the OP, pull your valve covers and check all your injectors, make sure they are TQ'ed to spec and go from there. I would bet more then likely one is not seated, or the copper did not come out with the old injector.
Lets just hope you have not burned a hole in a piston.
Postmaster
Joined: Jul 2006
Posts: 4,993
Likes: 2
From: Bend, OR
i would try to dye your fuel and run the engine, then use a uv light to check for leaks around the injectors. at work we use a pump to connect to the inlet side of the head and plug the return line, pressurize the head and check for fuel leaks around the injectors. hopefully someone on here has done this on a 7.3 or can help you out more on setting one up. good luck
Thread Starter
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Senior User
Joined: Oct 2009
Posts: 138
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From: Maple Valley, Wa
thanks for the input, the injectors were lubed before install my thought was that one wasn't seated but i supposed ill pull them all again and check for the copper washer thanks guys
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