ol' 93 12 valve

A friend of mine has a 2001 24 valve that he rebuilt and p pumped. It doesnt have 500 miles on it and it is puking oil out of the dip stick. It has had blow by since it first started and if you cover the blow by vent and hold it for a second it will start puking oil out the dip stick. It doesnt have a knock and the performance hasnt changed. We havent been able to get it timed so it is running kind of rough. There is nothing in the oil. What do yall think??

dozer12216

Could the vacuum pump be pumping air into crankcase due to hose disconneced.

Busboy

Did your friend stagger the ring gaps? If not compression is just blowing through. How about vlv seals did they get installed?

ol' 93 12 valve

We drove the truck easy today (shift @ 1500 rpms) and it didnt leak at all. Do you think that since the vacuum pump is gear driven that higher rpms may cause it to mess up? Yes he staggered the rings and installed the vlv seals.

Busboy

You may want to have a read of this thread. https://www.dieseltruckresource.com/...d.php?t=230933 He had the same problem your friend seems to have, OK when driven easy but pukes oil when boost is high.