Crankshaft Pulley

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kaleb58loboy
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Crankshaft Pulley

Postby kaleb58loboy » Fri Apr 05, 2019 12:45 pm

Hello
How far should be the pulley on the crankshaft?
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Jim Becker
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Re: Crankshaft Pulley

Postby Jim Becker » Fri Apr 05, 2019 1:57 pm

Until it bottoms out. (Not sure if that is the answer you need or if you are trying to determine if it has bottomed.)

Eugene
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Re: Crankshaft Pulley

Postby Eugene » Fri Apr 05, 2019 2:21 pm

The pulley/crankshaft is a compression fit and as Jim states, the pulley is suppose to bottom out on the crankshaft.
kaleb58loboy wrote:How to repair wallowed crankshaft keyway.
What size drill /tap crankshaft pulley for set screw to crankshaft.
The key is to align the pulley and crankshaft to TDC during pulley installation. If installed correctly, no need for the set screw.

Depending on how wallowed out the crankshaft keyway, I would see how straight up and down the key is in the slot. I would set the key straight up and down and reset the pulley. You will or should be within a degree or two of having the pulley set correctly.

Being off a degree or two will make the tractor hard starting if the spark occurs prior to TDC. Timing light and a slight bit of fiddling with distributor location will get the tractor starting and running properly.
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Re: Crankshaft Pulley

Postby Bob McCarty » Fri Apr 05, 2019 3:06 pm

The two I saw placed at the Louisiana Cubfest had about 1/8" space from the front engine cover to the end of the pulley. So about 1/8" of shiny shaft was visible. You will know when it has bottomed out; no more movement inward.
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kaleb58loboy
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Re: Crankshaft Pulley

Postby kaleb58loboy » Fri Apr 05, 2019 4:03 pm

Eugene wrote:The pulley/crankshaft is a compression fit and as Jim states, the pulley is suppose to bottom out on the crankshaft.
kaleb58loboy wrote:How to repair wallowed crankshaft keyway.
What size drill /tap crankshaft pulley for set screw to crankshaft.
The key is to align the pulley and crankshaft to TDC during pulley installation. If installed correctly, no need for the set screw.

Depending on how wallowed out the crankshaft keyway, I would see how straight up and down the key is in the slot. I would set the key straight up and down and reset the pulley. You will or should be within a degree or two of having the pulley set correctly.

Being off a degree or two will make the tractor hard starting if the spark occurs prior to TDC. Timing light and a slight bit of fiddling with distributor location will get the tractor starting and running properly.


Standing in front of the tractor the crank keyway is peened over to the left,the right side of the keyway is perfect and the key fits dead nuts against that side,the old pulley had to be cut off,however I have new keys and a new pulley.
I thought that maybe a little Loctite 660 to fill the gap where the keyway was peened over, I have since polished the shaft so should have on trouble installing the pulley.I'm adding the set screw for insurance.old AC tractors had them from the factory.
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Half of what you read
All of what you see.

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Re: Crankshaft Pulley

Postby Clubless » Wed Apr 24, 2019 10:14 pm

How did your repair work out? I am having a pulley issue on my cub.

Thanks
Gary


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