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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

What would cause crank pulley bolt to come loose?

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Old 06-22-2013, 11:55 AM
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Default What would cause crank pulley bolt to come loose?
Pulley bolt keeps backing out... Wtf?

Sorry didn't search.. On phone and not happy...
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Old 06-22-2013, 12:33 PM
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Are you sure it was/is torqued to the proper torque value? Have you used any thread lock compound on the threads?
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Old 06-22-2013, 12:34 PM
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Originally Posted by Rich-L79
Are you sure it was/is torqued to the proper torque value? Have you used any thread lock compound on the threads?
Yes, did both of those.
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Old 06-22-2013, 01:24 PM
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And that the dampner is not separating causing a vibration.

I'm sure you know the stock bolt is a single use torque to yield and cannot be resured as well.
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Old 06-22-2013, 02:12 PM
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Originally Posted by SC2150
And that the damper is not separating causing a vibration.

I'm sure you know the stock bolt is a single use torque to yield and cannot be reused as well.
The LS series engine's crank bolts are "torque to yield", but the LT1s aren't. The OP didn't say what engine he has....
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Old 06-22-2013, 03:22 PM
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Originally Posted by Rich-L79
Are you sure it was/is torqued to the proper torque value? Have you used any thread lock compound on the threads?
I have never heard of using thread lock on the crank bolt.
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Old 06-24-2013, 12:06 PM
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Originally Posted by leadfoot4
The LS series engine's crank bolts are "torque to yield", but the LT1s aren't. The OP didn't say what engine he has....
Good point. I assumed LS but may be wrong.
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Old 06-24-2013, 01:35 PM
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Originally Posted by 94NDTA
I have never heard of using thread lock on the crank bolt.
Not a good idea at all. That can cause a hydrolock condition and if the bolt is torqued too much it may strip the crank threads, or give a false torque reading which means the bolt is not where it should be and then it will back out. Do not use thread locker on the crank bolt. Completely unnecessary.
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