ty20404
NAXJA Forum User
- Location
- Raleigh/Charlotte, NC
So I picked up a 96 Cherokee with what I believe is a cracked head. I've got the engine disassembled as well as a remanned head and gasket set. Once I got the engine apart it was apparent that there was a lot of carbon build-up on the piston heads as well as in the intake and exhaust manifolds. I'm guessing this build-up was a result of coolant/oil getting into the intake/exhaust ports.
Because the engine has 236k miles I'm starting to thing that I will need to replace the piston rings as well... I already cleaned up the piston surfaces and got all of the deposits off but I'm worried that the remanned head will cause excessive blow-by.
If I'm going to replace the rings I'm assuming that I need to replace the connecting rod bearings. I really would like to avoid replacing the main bearings however and don't feel that it's too necessary considering the Jeep was well taken care of until the overheating incident that resulted in a cracked head. The oil that was drained was still very clean and I don't believe that any significant amount of coolant entered the oil system. When the vehicle runs (before the tear down) the oil pressure was still above 60 psi. How critical is it that I replace the piston rings? If I do the rings I will replace the rod bearings, but how critical is it that I mess with any of the other crank bearings? I would preferably like to get away without pulling the crank.
Thanks.
Because the engine has 236k miles I'm starting to thing that I will need to replace the piston rings as well... I already cleaned up the piston surfaces and got all of the deposits off but I'm worried that the remanned head will cause excessive blow-by.
If I'm going to replace the rings I'm assuming that I need to replace the connecting rod bearings. I really would like to avoid replacing the main bearings however and don't feel that it's too necessary considering the Jeep was well taken care of until the overheating incident that resulted in a cracked head. The oil that was drained was still very clean and I don't believe that any significant amount of coolant entered the oil system. When the vehicle runs (before the tear down) the oil pressure was still above 60 psi. How critical is it that I replace the piston rings? If I do the rings I will replace the rod bearings, but how critical is it that I mess with any of the other crank bearings? I would preferably like to get away without pulling the crank.
Thanks.