Need some MAJOR help with this sound- tranny/thrust bearing

Performance mods and Advanced Stroker discussion.
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SilverXJ
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Joined: February 14th, 2008, 7:14 am
Stroker Displacement: 4.6L
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: Cherokee
Location: Radford, Va

Re: Need some MAJOR help with this sound- tranny/thrust bearing

Post by SilverXJ »

threemilesout wrote: As far as the engine goes, I don't know what the rebuilder did or didn't do. I took a closer look at the thrust bearings from the second time it wiped out and there is visible wear to the bearing surface, making me suspect that a lack of proper oil is causing the problem. If it was the transmission, I would expect only damage to the thrust surface, but the journal surface to be clean. They are both damaged. He put a rebuilt crank in the second engine that he said he turned himself, so I can only assume that he did it correctly.
It does sound like you have an oiling issue. The gallery to the thrust bearing also feeds the #2 cam bearing.
I don't know what the status of the cam bearings are since I didn't see them and the rebuilder never mentioned anything to do with the cam.
I would at least ask him if he saw anything odd on the cam bearings.
I have 300 miles on the car now, mostly around town. Any drive over 30 miles warms up the engine enough and causes the knocking to begin. Otherwise, I'm going to drive it until it gets worse and the crank sensor won't read!
That sounds like mine. Get it nice and hot and it knocks.
Also, there is approximately 1/8 inch of play forward/backward on the crank right now. There was no real perceptible movement when I installed the engine.
Ugh.. sounds like its gone again.
lafrad
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Re: Need some MAJOR help with this sound- tranny/thrust bearing

Post by lafrad »

I would expect that thrust bearing main journal to be worn if the thrust surface itself got worn like you describe. When you squeeze the bearing material that hard, it could easily squish INTO the crank instead of out.

However, just to be sure... the thurst bearing was installed correctly right? the oil passage wasn't blocked by an improper install or something?
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