Spun bearing need advice.
#16
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Year: 1992
Model: Cherokee
Engine: 4.0 liter I6
When I acquired my Cherokee the bearing were down to the copper due to coolant in the oil from cracked head. I replaced the crankshaft with a kit from advanced autoparts. I also replaced the cam bearings and timing set as well as oil pump and lifters. I took it to an engine builder to have the cam bearings and freeze plugs put it as well as hone the cylinders. Total at the engine shop was $250. He checked all my rod bores too for out of round. I think total I had $750 in rebuilding the engine and pretty much have brand new running engine. I replaced anything with oil running through it due to bearing material in the engine.
#17
The more I think about the more I think the rebuild might be the better option. Was thinking of looking for a machine shop to take a look at the block for damage. Haven't had a reason to look for a machine shop since I moved where i am at now
#18
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Model: Cherokee
Hey everyone! I am new to the forums, but I am looking for advice. I was given a 97 cherokee. The 4.0l inline 6. They guy that gave it to me said he spun the bearings and I was curious to see how other would approach this. Do you think it's worth replacing the bearing or just save up for a long block? Also if anyone has had the same issue and replaced the bearings what else did you have to replace? Any advice is greatly appreciated!
#20
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Year: 1988 Comanche
Engine: 4.0
If the engine spun the bearings you can not just install new bearings. If the rods spun you need new rods, if the mains spun the block will need to be machined. With that said I would look at the bearings to confirm they spun. If they are just worn out then you can turn or polish the crank and put new bearings in. I dont know how the PO would know they spun unless he actually looked. If they are spun I would start with a used engine and rebuild that.
#21
Thanks for advice. Been kind of pricing out a lot of options at this point. Dropped the pan and surprisingly everything looks good. So at this point not sure what to do. Going to try to meet up with PO to see what the symptoms were.
#22
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Year: 1988 Comanche
Engine: 4.0
I drop the crossmember and let the rear down a little. Then you can get on them with a long extension and a u-joint. I dont remember the socket size but you can pick up a set at the parts store for not a lot of money. Its not bad to have them around as our jeeps have several torx bolts here and there. When you put it back together you can use regular bolts.
#23
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Year: 1988 Comanche
Engine: 4.0
Good idea talking to the PO if he had a knock it may have been the flex plate not a rod. The flex plates are know to crack or come loose and make a knocking sound.
#27
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Year: 1988 Comanche
Engine: 4.0
#30
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Year: 1988 Comanche
Engine: 4.0