Ethan Turner
Registered User
I got some gunk on my #5 injector I was wondering if someone could tell me what it is what's the problem and some fixes for it
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Gunk on injector
- Thread starter Ethan Turner
- Start date
Ethan Turner
Registered User
The motor is a 87 6.9 I think it was swapped before I got it
genscripter
Full Access Member
A long time ago, back before I did my rebuild and head replacement, I had my #4 injector just like yours. I just assumed that when the PO put in those injectors, he probably didn't use a new copper compression washer or didn't torque the injector completely down to spec. Fuel bubbled up and filled the cavity around the injector and head. It hardened to the gunk shown in your image.
icanfixall
Official GMM hand model
If this crud wipes off easily then its oil and water leaking down past the threads and its not a problem but... If the bottom copper gasket is leaking and this is hard crud.. Well you probably have a cut injector seat in the head. that will be repaired with a seat reamer. To stop this oil and water from getting in there past the injector threads just apply RTV to the injector threads. then install it in the head. DO NOT put anything on the copper gasket.
Hydro-idi
Full Access Member
That’s somewhat normal. Turn on the wire wheel or brush it off.
Ethan Turner
Registered User
Ya it came right off with some pb blaster and a shop rag with it being a 6.9 I wanted to make sure it didn't have something to do with the head gasket thanks for all the info
