A couple months ago I developed a miss in the motor. It would come and go depending on temp so I thought it was an injector--they had 240,000 miles on them. Got a used set of full force stage I's (had 5,000 miles on them) and installed. Truck ran better\smoother but noticed that the oil level was going up. Pulled the injectors thinking I cut and o-ring, new rings and crush washer and reinstalled. Same result, 1 quart gain in about 50 miles. Didn't see any milkiness or white build up in the oil, drained a quart from the bottom of the pan in a clear jar--no seperation so I thought it was fuel. Pulled the injectors and sent them to jim for a rebuild and 80% nozzles and reinstalled. visible the cup looked fine but never pressure checked. Yesterday after 100 miles I checked it again and oil is still going up, was very foamy( nothing unusal lokking in the valves covers--white crap\coolant). Pulled the oil cooler and rebuilt and drove it today for 50 miles. At a light throttle about 35mph there was a loud pop and the motor lurched and then smoothed out. Came straight home and am a quart to quart and half high, coolant level is low and has white gunk inside the degas bottle(just a small amount on the lid and top) Ran CC test and it passed (buzz to for the heck of it-passed)

Any ideas\ thoughts? Thanks

 

Bad fuel pump leaking fuel into the oil is the only other way I can think it can over fill the crank case, unless its got some real bad rings in a hole.

on edit, after waiting 5 MINUTES for the site to upload my post I see you have electric fuel....atleast I gave ya a bump.

Diesel Rod

 

Same thing after a rebuild? Cracked block? I don't know! Weird!!

 

Cracked injector cup maybe ? or more than one cracked injector cup ? internal fuel rail leak ?

 

When you rebuild a motor you put in new injector cups. Internal fuel rail leak sounds likely.

 

I didn't rebuild the motor - just the injectors (rosewood). There is a tiny bit (5-10 seconds) of white smoke on a cold start up but that is it. Yesterday morning was in the upper 40's and it didn't smoke at all. If the cups where cracked wouldn't I be getting oil to coolant or oil to fuel no the other way round. HPO is 2500-3000 psi compated to 70#'s of fuel and 20 some #'s of coolant.

Let me ask this for you guys that have e fuel---how long does it take the fuel pressure to bleed off after you turn the truck off? Mine drops about a pound a second and is flat in a minute.

 

Mine doesn't drop that fast. After an hour mine will still be 30psi or so.

 

That is what I remebered a couple years ago when I first switched to e fuel. Now looking at it I can watch the needle drop to 0. No external leaks so either the pump is allowing fuel to leak back into the tank or something in the head. If it was a bad injector o ring I should be seeing a lot of smoke and run rough--plus I am on my thrid set of brand new orings. injector cup would be a coolant issue-nothing to do with fuel right? fuel rail doesn't come into contact with the deck so not a headgasket issue? So I would assume that leaves me with a cracked head?

 

Most likely a cracked head. Next oil change let it drain real good then run your fuel pump, see if fuel drains out the oil pan. Also pull the line off one head to narrow it down to one side.

 

Thanks for the idea, I'll give it a try

 

Good idea Rod, reps sent.

 

x2 on draining the oil and watching for fuel. do you still have the miss? starting to think injector cup.

 

X2. reps sent.

 

Thanks guys, I didn't think it was that great of an idea, but if you guys do ill take it! Is It possible that one of the injectors has an internal leak? Since the mixing started after the injector change, With a 7-1 ratio inside them it is possible for the fuel to get into the oil pressure wise but I would think you would notice a good miss if it was leaking internally in the injector.

 

Internal injector leak was a thought when I first put in the used (full force stage I rebuilds with 5,000 miles on them) So I pulled them and sent them to Rosewood to rebuild again into stage II's. So I doubt it could be leaking inside the injector. I am going to do a compression test on the motor tomorrow before I decide on pulling the motor for a rebuild or just pulling the heads and getting new ones.