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I received a free LQ4 from a buddy of mine, knowing it had a spun crank bearing. It did not wear through the bearing. In your opinion, how damaged do you think this saddle is? What would a machine shop do to be able to fix it if it needs fixed?
From the angle of that pic, I don’t see any indication that the thrust actually spun. Find a quality shop…hard to find these days…and have them check the mains. Might need a hone at minimum which personally I like to have done anyway on my builds.
Doesn’t look spun to me either. Factory line hone marks are still there.
Block will need some serious cleaning though.
Agree on having the main line checked.
As stated that does not look spun. When they spin, you loose the tang that helps locate them.
If you lose oil pressure, you can wipe out the bearing journals pretty quick.
If it was the thrust face that was wiped out, it could be caused by transmission or driveline issues.
I agree with the guys, the bearing did not spin. Cap and block look good. Just curious; did this engine have the auto trans? Asking because I once had an LS1 that had the A4 in a C5. In 30,000 miles, the thrust was at .028"!!! Why? Because there's a pinch bolt on the flexplate of the C5 torque tube. If you run the engine hard for extended periods, and coolant gets into the 240° range, there's a lot of aluminum to expand when heated to that degree. This puts tremendous pressure on the thrust bearing. My bearing shell had only 1 "witness" mark left that was barely visible. I see this is an iron block, but I'm just curious about the other the drivetrain components. RONSSNOVA has informed me that there is an aftermarket flexplate available with no pinch bolt......
05-30-2022, 07:54 PM
Spun Thrust bearing damage? 
