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Allis Chalmers Discussion Forum

front fan belt pulley on crankshaft

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WD 45 Diesel fan

02-19-2011 13:59:22

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The lock nut on the front of the fan belt pulley came off and the key got lose on the crankshaft and subsequently has really wollered out the crank key set (also pulley key set). Is there any hope to fix besides a new crank?

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WD 45 diesel fan

02-19-2011 18:15:42

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 Re: front fan belt pulley on crankshaft in reply to WD 45 Diesel fan, 02-19-2011 13:59:22  
Appreciate all the suggestions. surprisingly the pulley seems fairly tight on the rest of the shaft. I think one of these might work...I hope!

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02-19-2011 17:42:14

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 Re: front fan belt pulley on crankshaft in reply to WD 45 Diesel fan, 02-19-2011 13:59:22  
First thing I would do is to clean it up. By the looks of it, the seal has been leaking, for quite some time. Once you get it clean, then put an indicator on it, and see if the crank runs true. If it does, then get a junkyard pulley , that came from a good crank. If it fits snug, you are in business. First replace the leaking seal, then JB weld the wallered out keyway, and install the pulley. Let the JB weld harden, making sure the pulley is a close to true, as possible. Then drill a hole through the pulley, JB weld, and crank. Hole should be 3/8". If the pulley is loose on the crank, you might be able to use this trick: Cut a slot in the pulley, with a chop saw, or a tailpipe whizzer wheel, at the keyway slot. Install on the crank, and make sure you drill the bolt hole, at right angle to the slot cut in the pulley. That way, you can tighten the 3/8" bolt, and it will clamp down on the pulley, eliminating the slop. I would never attempt to weld a crank pulley to the crank, because heat might cause you more problems, than just the seal.

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Uncle Ernice

02-19-2011 16:22:45

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 Re: front fan belt pulley on crankshaft in reply to WD 45 Diesel fan, 02-19-2011 13:59:22  
That is an ugly looking mess for sure. Get a replacement pulley and see how well it fits the shaft. If it is tight on the shaft and doesn't wobble you may have a fighting chance to either reuse the slot for the woodriff key by using a new key and some JB weld or cutting a new slot as suggested. If she is loose good luck. I would also be replacing the front seal as it is probably damaged from the loose pulley.

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02-19-2011 15:47:25

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 Re: front fan belt pulley on crankshaft in reply to WD 45 Diesel fan, 02-19-2011 13:59:22  
I have made key slots with a dril. If you remove the pulley, cut a new key slot and get a good pulley. You might be alright if the shaft isn't worn too bad. If the shaft is worn, as a last resort, I would shim so that it runs true and then fill with JB Weld. Make sure the surface is clean. I clean with alcohol first. Bob

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WD 45 Diesel fan

02-21-2011 12:44:26

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 Re: front fan belt pulley on crankshaft in reply to chalmersbob(pa), 02-19-2011 15:47:25  
Any one know where I can find another pulley? The crankshaft itself isn't too bad, but the pulley probably won't work.

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