Sudden Oil Usage

Rebuild Time! Rings are given out! That is a good mileage for that engine.

 

How long did it take after repair to start using oil? If Immediate I would say that when they pulled injectors they let fuel from rail run into cylinders. If the fuel is not removed and the engine is just cranked over there isn't enough room for the extra fuel and this causes a hydro lock which can break the pistons between the rings. This will cause excessive blowby and oil use. Its possible that the intake tubes from air filter to turbo inlet wasn't installed correctly and "dusted" the engine. But this takes several miles depending on conditions. I have also never liked putting a new head on a million mile eng without overhaul, or doing the bottom with out the top. It just causes it to find the next weak point. Although I have seen it work. You could have the exhaust manifold pulled and see what cylinder is blowing the oil if its the new head there could be a problem there.

 

Very well could be the turbo. Tell tail sign of bad turbo is oil in the exhaust. N14 is an excellent motor. You should have no problem getting another 300k. If your engine was burning that much oil you would not only be blowing blue smoke out of your exhaust like a crop duster. But you would have a major loss of power.

 

that is nothing for an n14 Cummins please don't tell that driver he needs rebuilt engine

 

I agree putting on a new head makes everything tight on the top end and can and usually does increase oil consumption but not to that extent

 

Didn't the N14 have 3 heads? If it's 3, was 1 replaced or all 3?

Either way, new head (s ) with tight guides and seals would definitely put pressure on the rings that wasn't there before. But I'd check the turbo first and eliminate that before looking further.

 

The for sure way is pull the exhaust, you can see each individual exhaust port. that will tell you exactly which cylinder or cylinders is puking. Naturally spin the turbo with your hand when you take intake pipe off but the blow by dripping out the tube is a dead give away about a cylinder problem. Naturally the head that was pulled the tops of pistons were dried off but the others probably weren't. If just one cylinder shows to be puking odds are piston will be broke between the 2nd and bottom ring. If all 6 make sure it is not sucking dirt. BTW the exhaust manifold doesn't have to come all the way off just pull it away from head it will show itself.

 

I have a n14 that has been rebuilt twice in keeps blowing oil n pistons stick or melt what am I missing