Maybe not Antique but old 3306 & powershift

If the trans oil is black change the rear crank seal.
Later Bob

If it's like mine (3306 - D6c) there are 2 coolers on the side of the engine...one is engine oil-to-water and the other is trans oil-to-water so I don't think that's the problem. If it was you would see water in transmission.

Hi Team,
if the Trans pump is fitted to the flywheel housing with the engine oil lubed gear train it also could be the transmission pump input shaft seal leaking/cooked hard or fitted back to front. The seal lip faces out as it has to seal against pump suction head as the void behind the seal in the pump housing is connected to the suction line to drain off any trans pressure oil leakge past the pump shaft bearings.
Hope this helps.
Cheers,
Eddie B.

Hi edb,
Following along on this post and have a question.
No doubt there is a path there but if that seal was shot or reversed, wouldn't you draw air in or loose suction rather than have flow outward into the flywheel housing.....maybe I'm missing something.

Hi OM. Transmission pumps on the D8H and K were famous for transferring engine oil to the transmission when the seal went bad. Unfortunately its been too long since I've had one apart to explain why. The pumps I repaired/replaced gradually got worse which gave me time to recognize something was going on with the trans oil as it steadily got darker. I don't remember one that transferred large volumes of engine oil in a short period of time. Maybe I just got lucky before catastrophe settled in.

Hi Mike,
I suppose it's possible the D8 transmission pump could suck engine oil from the pto housing if the seal was bad, maybe some air too??

Seems a little different on the 3306 where the gear train is hanging on the housing in back of the flywheel. There would be some lube flying around from the engine supply as edb mentioned. What happens when the idler bearing goes bad and you loose oil control??

Hi OM,
yes, depending on how shot the seal is you will draw air AND oil in from the 3306 engine oil lubed pump drive train---if that is what is fitted--- we are working with scant info from the inquirer so we are just trying to cover all bases for him as there may be other possible leakage paths apart from the engine rear seal.
Mike Walsh has covered it as it usually occured, slowly, and then one day they would not prime after a hot restart, if they got bad enough. An alert operator would hear the "marble in a peepot" sound on start up as the air went through the system and ask why.
Cheers,
Eddie B.

Thanks for the replies, I know nothing of this power units history before it went into the pettibone , I don't see an engine driven trans lube pump, So it is probably the rear main seal on the engine, I don't know how fast the oil is transfering , we just noticed it , the machine doesn't see much use an needs a lot of work . How much damage will the crank case oil cause if any ?? The way the machine is built the engine has to come out to pull the pan so it is a fairly large head ache , and once you get insidem where do you stop??:noidea:

Can you post the engine serial and arrangement number?

Also the vintage of the Pettibone unit.