Wrist ring on piston
 

My grandpa has a 2001 dodge 24 cummins 5 speed. He was hauling grain with it he noticed some knocking and there was oil coming out the blow by tube. He took it to a mech. and they said some wrist ring had broke on a rod on the piston. So now he has to do a $7000 overhaul. I know he has a chip of some kind in it, and he wants to know how it might have happened? If you guys have any ideas please get back.
Thanks

a rod ring?????? wrist pin maybe?

Ya :argh: thats what it is he said, thanks

a rod ring i like that

how many miles are on this truck

Wrist pins aren't known for breaking. It could have taken out the Wrist pin bushing, possibly. Another option is a broken compression ring. That would explain why the crank case is pressurized with cylinder pressure. Either way, I would either bore scope the cylinders or pull the head and inspect for damage before committing to a complete rebuild. Its easier to pull the motor with the head off anyways.

a rod SNAP ring could have broke and the wrist pin moved out. and it gouged the side wall and thats were the knock and blowby came from

like maybe a 150,000 miles