Bolt walking out of the crank!!!
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Teching In
Joined: Dec 2006
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From: Houston/Kansas City
Bolt walking out of the crank!!! I just finished retorquing the harmonic balancer on my buddies 2000 SS. IT keeps walking out at higher RPM's, any idea of what could cause this? We've lock tighted it to. It seems to be in balance, it doesn't appear to have any run out. Also do stock cranks LS1's have keyways in the crank?
Is it the OEM Balancer? If not I would check the hole size... otherwise use stronger threadlock and a MASSIVE amount of torque. I used my BMR torque bar and it SLAMMED that bitch on there. I got the full 140 degrees...if not more. 
Thread Starter
Teching In
Joined: Dec 2006
Posts: 34
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From: Houston/Kansas City
Slp harmonic balancer, we already tried the ARP bolt route. If it backs out this time we'll torque the bitch the full 37lb then 140degs, just seems like the bolt may break or the threads strip if we take it any farther. We got it at about 37lb then 60 degs.
Also thought of a tack weld on it, that the last resort.
Also thought of a tack weld on it, that the last resort.
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Teching In
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I was confused by the unecessary keyway in the slp balancer as well. We damn near stripped the threads out of the crank trying to pull it into the notch. We could only pull off a 90 degree turn after the 37 lbs of torque and were a little worried, but it has been runnin' strong ever since.
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Seat your pulley back onto the snout of the crankshaft as best you can by hand. If you purchased a longer crank bolt which I *highly* recommend, start threading this in now and pull the pulley on about a 1/4 or 1/2 an inch and remove the longer bolt. Use your old stock crank pulley bolt to pull the pulley onto the crankshaft until the bolt seems to get impossible to turn. Grab your biggest torque wrench and attempt to torque that bolt down to 240lb/ft. I have always stopped at 200lb/ft on my installs and I've never had a problem, so if you can't hit 240 (which I never have), don't worry about it. Now, break the bolt free and remove it.
NOTE: If you did not buy a longer crank bolt, and you are reinstalling the stock pulley, you run the risk of stripping out the first few threads of the crankshaft. This will NOT be fun to fix! Take your NEW crank pulley bolt and thread it in all the way by hand. Torque this bolt to 37lb/ft. Now, we need to stretch the bolt into place. Get your breaker bar and pipe extension, and try to turn the bolt 140degrees past where it is at now, keeping in mind the engine will be trying to turn some and those are degrees you can't count. Again, I always seem to get about 90-100 degrees worth (estimating, knowing what 90 degrees looks like) and leave it as is so don't worry about going crazy here.
NOTE: If you did not buy a longer crank bolt, and you are reinstalling the stock pulley, you run the risk of stripping out the first few threads of the crankshaft. This will NOT be fun to fix! Take your NEW crank pulley bolt and thread it in all the way by hand. Torque this bolt to 37lb/ft. Now, we need to stretch the bolt into place. Get your breaker bar and pipe extension, and try to turn the bolt 140degrees past where it is at now, keeping in mind the engine will be trying to turn some and those are degrees you can't count. Again, I always seem to get about 90-100 degrees worth (estimating, knowing what 90 degrees looks like) and leave it as is so don't worry about going crazy here.
this is what ls1howto.com says
Ive had mine come lose twice now using 271 locktite 
I cant figure out how to hold the motor/drive train in place while torquing the bolt to 200+ lbs on an automatic car .
I think im gona have to make something to lock something into something somewhere ,, hehe
I cant figure out how to hold the motor/drive train in place while torquing the bolt to 200+ lbs on an automatic car .
I think im gona have to make something to lock something into something somewhere ,, hehe
Originally Posted by =ZoomZ=
Ive had mine come lose twice now using 271 locktite
I cant figure out how to hold the motor/drive train in place while torquing the bolt to 200+ lbs on an automatic car .
I think im gona have to make something to lock something into something somewhere ,, hehe
I cant figure out how to hold the motor/drive train in place while torquing the bolt to 200+ lbs on an automatic car .
I think im gona have to make something to lock something into something somewhere ,, hehe
