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Old 10-20-2011, 12:09 PM
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Driveline Check..

I wasn't sure if this would go in the engine or transmission section. I recently had a local machine/engine shop build a 412 small block Chevy for me. I Had the works done to the block, re bored, line honed, resurfaced heads. Well after less than 500 miles the engine is already out of the car. We took the oil pan off and found that the #3 cylinder wrist pin was falling out of the piston head and grinding up against the cylinder wall. Upon further inspection the entire crank is moved forward and it is hitting the front end of the engine block. The thrust bearing is shot and so it everything else. I took the motor back down to them and they said it was our fault that the crank was wore forward because he said the transmission was pushing the crank forward.
The torque converter is brand new and it was installed with the proper clearance. My question is has anyone even heard of a torque converter pushing the crank through the front of the block (over time)? Any thoughts?

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Old 10-20-2011, 02:52 PM
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Torque convertor ballooning can cause that sort of damage to the thrust bearing. The wrist pin coming out may or may not be related.
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Old 10-20-2011, 05:39 PM
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How would i know if the torque converter was ballooning? We are not running a trans brake and we are only making like 400 hp so would it be likely to balloon? Even if it is brand new?
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Old 10-20-2011, 06:23 PM
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Depends on the convertor. You can get any convertor with an anti-balloon plate added. I know alot more about engine than trans, so I would call some trans people and ask.

I have watched flexplates while a car was being dyno tested and the flex in the ring gear was noticeable and the amount of deflection surprisingly large.
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Old 10-20-2011, 06:26 PM
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Thanks for the info
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Old 10-21-2011, 01:14 AM
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Check the TC/TorqueConverter snout to see if it's been contacting the Flexplate in the center.
TH400 Trans are bad about balooning TCs.
The TC feed circuit can be restricted to prevent this.
Good Info in this Thread about Orifice sizes etc.. >> http://www.turbobuick.com/forums/tra...-pictures.html

Crappy Off Shore Cranks can also be a cause of wiped out Thrust surfaces.
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Old 10-21-2011, 01:19 AM
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High trans line pressure and/or clogged or restricted lines or cooler can also contribute to wiped thrust bearings according to some.
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