871 oil mixing with fuel

[Starlight]

(08-03-2017 )Rawze Wrote:  

(08-03-2017 )Starlight Wrote:  I have seen this before. Being 09 and having done the fuel sample it seems I see a conection between your truck and one I repaired a while back. On the one I did it was the injectors being bad. What had happen was the injector preload had lessened overtime with wear and allowed compression gasses to enter the fuel sytem through the injector when running. The preload was very low. They were so carboned up it caused a hard start and it had smoke as well. The fuel tanks were black as well as everything else in the system. All the injectors leaked on the injector leak test. Installed new injectors and problem was solved. Even ran smooth when before there was a slight miss and a minor hunt.

Its funny you mentioned that. Had a guy here not too long ago where someone set his overhead and they adjusted all the injectors to 0 in-lb. I wondered how badly it would have failed an injector leak test with it adjusted like that, but then again, there is supposed to be a check valve in the injector to prevent it.

Perhaps always a good idea to adjust the overhead before an injector leak test? -- Just some thoughts on it.

If caught early enough then a set up before a leak test might and should work. In my case it made no difference as the pintle was damaged already. The check valve becomes defective with prolonged hot combustion gases being pushed thru it.