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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Dec 2013 Posts: 178 Shop Shark | | Shop Shark Joined: Dec 2013 Posts: 178 | Pretty embarrassing when the crank pulley comes loose when her show'n off how well the old truck runs. Its a 235 with the ears on the pulley. The woodruff key is still there. Thanks.
Have you ever noticed that anyone driving slower than you is an idiot and anyone driving faster than you is a maniac? - George Carlin
| | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | Most likely the pulley is loose - worn inside the hole.
It is possible to drill/tap the front of the drive shaft to take a bolt. A member here sells/rents the tools to do this (Jerry, who posted the next message").
However, the hole in the pulley may be wallowed-out so badly that the balancer might wobble even with the bolt.
While the balancer is out, check the seal-surface (for the seal that sits in the cam/crank gears cover). If the seal surface on the balancers is grooved, a repair sleeve is available. If the seal looks bad, you might have to remove the cover to replace the seal. To do that, you will have to remove the oil pan. At that time, you might want to do a drill/tap to allow the cover to be removed by having the attachment bolts outside the front of the block (rather than from inside the pan)
Last edited by tclederman; 11/22/2016 4:10 PM. Reason: added note about Jerry
| | | | | Joined: Feb 2004 Posts: 29,875 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,875 | Magnaflux the balancer hub to check for cracks. It's not uncommon for a hairline crack to develop along the edge of the woodruff key slot which allows the press fit to go away. Otherwise, it's probably a matter of slight motion between the crank snout and the hub that wears both items a little. The fix is to drill and tap the crank for a bolt and machine a step into the hand crank lugs for a flat washer to bear against. Use red Loctite on the pulley hub to take up the clearance.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
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