Heavy Equipment Repair Questions? Ask an Expert Now.
Welcome to JA!
Here is a exposed view of a Detroit 3 cyl engine.
you can have a broken compreshon ring'
bad valve stem seal
with it running remove the oil fill cap of you feel a lot of blow by here then we know its a compreshon ring.,,sleeve or piston.
of its ok there then its a valve guide seal
Let me know if i can help more!