Odd bearing wear

[larrym]

Pulled the thrust cap off the motor that was in my car.
It always had a vibration at about 3000 rpm it pulsed figured it was a balance issue from the previous owners rebuild.


Would a rotating assemble out of balance cause wear like this?

[earlbrown]

that looks like a spec of crud beneath the bearing.



....assUming the bores are nice and round and true and the crank is straight and the journals are nice and round and true.

[larrym]

Nice fretting on the caps too 

[Scoobum]

Larry...not sure if an engine imbalance would cause that. The original engine in my car had a heckuva vibration to it...never thot to ask Joe what the bearings looked like when he freshened it up for me. That engine is the one I`m currently beating on...and I always have Joe balance the rotating assemblies on all my engines.

[Joe Buick]

Scoob! If I recall in your engines the Bearings always look evenly worn. I can always save them for you next time.

[Scoobum]

Scoob! If I recall in your engines the Bearings always look evenly worn. I can always save them for you next time.

I learned early on to get off the loud pedal if I see a hint of KR....cuz it`ll turn bearings into tinfoil in a heartbeat. I have Joe magnaflux the block, rods and crank...and the crank and rods are checked for straight. If an align hone is required...the n it`s done...along with the deck being checked for straight. The big ends on the rods are also checked for size...and the rotating assembly balanced. I leave the bearing clearances and ring gaps up to Joe. He does the oiling mods to the cover and sets the oil pump clearances.

Getting back on track. Larry, it`s hard to say if the clearances were correct in that engine...or how much KR it saw.