Help My thrust bearing failed why??

Question

This is a small block Ford. I'm running a AOD-E tranny. The engine is about

4 months old. Could there be a issue with the tranny? The tranny wasn't changed but the engine was completey new. The bearing failed on the rear side. The clearances on the crank were all check and double checked. Was there to little play between the converter and flex plate? There was not any bind the converted would move freely in the bolt holes in the flex plate. ( back and forth) Thanks

Backyard Mechanic · Accepted Answer

Stumper!  That last remark shows that there shouldnt be an trans input shaft binding causing it.

Jim Warman · Answer

Check the transmission cooler lines.... if there is a restriction (pinched in the R&R process or whatever), the converter can either balloon or be forced forward enough to give grief....

Backyard Mechanic · Answer

Hah!Warman to the reskyew!Only thing I could think of was a bent rod... but that shouldnt destroy it taht fast.

Bill · Answer

One of the things that can cause a thrust bearing failure is improper assembly. When the thrust bearing main cap is installed, it needs to be seated properly and crankshaft end play needs to be checked. (I like to see about .006) I do it with a dial indicator, but I know guys who use feeler gauges with no problems. I had to flat plate a set of main bearings one time to get the clearance I wanted. If the main cap was installed with insufficient clearance, that could very well wipe out the thrust bearing since the transmission tends to push on the crankshaft.Good LuckBill

Help My thrust bearing failed why??

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