Odd damage to rear of block
Thread Starter
Joined: Aug 2011
Posts: 4,729
Likes: 814
From: Portland, OR
Odd damage to rear of block 
So LC9 block I bought as a spare in case I bust my L33.
I didn’t look it over real close, but spotted this when looking for the casting number.
Inside the rear cover. Machined surface, but doesn’t really do anything.
Cant imagine what caused this? Any ideas?
Thread Starter
Joined: Aug 2011
Posts: 4,729
Likes: 814
From: Portland, OR
After further review, thrust bearing failure is spot on. I can see that the crank throws hit 3 of 5 main bulk heads. 5,4, & 2.
Saw this on my buddies 6.0 when it lost the thrust.
Saw this on my buddies 6.0 when it lost the thrust.
Ron SS, you may remember my discussion with you and a few others, in a thread I was posting to, about the A4 flywheel pinch bolt not allowing for thermal expansion, like the slip fit splines on the M6/12 transmissions do. I explained that the best way (which I was informed of by a GM tech, and it makes sense) to do the pinch bolt was to have the drivetrain totally warmed up to temp, then quickly loosen the pinch bolt to allow the splines to "find" their proper position in a normal/fully hot temp situation, then re-tighten. My point is, did this block come out of an auto trans vehicle, or is that info unavailable?
Thread Starter
Joined: Aug 2011
Posts: 4,729
Likes: 814
From: Portland, OR
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Thread Starter
Joined: Aug 2011
Posts: 4,729
Likes: 814
From: Portland, OR
Ron SS, you may remember my discussion with you and a few others, in a thread I was posting to, about the A4 flywheel pinch bolt not allowing for thermal expansion, like the slip fit splines on the M6/12 transmissions do. I explained that the best way (which I was informed of by a GM tech, and it makes sense) to do the pinch bolt was to have the drivetrain totally warmed up to temp, then quickly loosen the pinch bolt to allow the splines to "find" their proper position in a normal/fully hot temp situation, then re-tighten. My point is, did this block come out of an auto trans vehicle, or is that info unavailable?
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Brett Foote Hmm. That's interesting. I do remember that at one point in time someone offered a service that drilled into the oil galley that supplies oil to the main saddle that the thrust bearing uses, thereby feeding pressurized oil to the thrust bearing. I'm thinking it may have been Kurt Urban performance. I think Kurt is at Scoggin Dickey now. I'm sure he could help if you desire that service.....
Hmm. That's interesting. I do remember that at one point in time someone offered a service that drilled into the oil galley that supplies oil to the main saddle that the thrust bearing uses, thereby feeding pressurized oil to the thrust bearing. I'm thinking it may have been Kurt Urban performance. I think Kurt is at Scoggin Dickey now. I'm sure he could help if you desire that service.....
