Engine/Transmission (1994 - 1998) Fuel leak at #2 hold down bolt

[Cody Gamble]

Finished putting a rebuild 1997.5 12 valve engine together to swap into an econoline. While ground running it on the stand the only issue I noticed was that there is a “class 2” fuel leak coming from under the #2 injector hold down bolt. It’s not the return line or the feed line. You can see it bubbling up from where the injector body and the hold down bolt meet. These are brand new 5x12s 145 degrees from Diesel Auto Power. I swapped in new hold down bolts and copper crush washers (thin ones) and it still leaks. Any ideas?

 

[NIsaacs]

I would guess a bad injector. Are they new Bosch bodies?

 

[Cody Gamble]

I would guess a bad injector. Are they new Bosch bodies?

No. They’re aftermarket bodies. I have my old injectors that I was told were good, but out of an abundance of caution I bought these new ones after completing rebuild. Can I put an old stock one in and swap out the bad one to troubleshoot? Also, I’ve run the engine several times for a total cumulative time of about 20 minutes. Should I be worried about diesel in the oil?

 

[GAmes]

I agree. The body is leaking from where it attaches to the tip.

 

[GAmes]

No. They’re aftermarket bodies. I have my old injectors that I was told were good, but out of an abundance of caution I bought these new ones after completing rebuild. Can I put an old stock one in and swap out the bad one to troubleshoot? Also, I’ve run the engine several times for a total cumulative time of about 20 minutes. Should I be worried about diesel in the oil?

I think trying one of the old injectors is a good idea. I doubt that you got fuel in the oil, it was leaking externally.

 

[Cody Gamble]

I just installed a “new” injector from DAP. They swapped out the one in question. Yep—it was a bad aftermarket body— the “new” one works w/o leaking. Thx guys.