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Pulley Rattle

FM Former Member
I thought the regular rattle in the motor was a bad hydraulic valve lifter. I took off the pulley for tin installation and foudn that the key between the shaft and pulley had pushed back (toward the motor) and out of the slot, bending the pulley keyway. Once it was repositioned in the key-slot and pulley repaired, I found that the retaining bolt would not snug the pulley against anthing; the bolt bottomed out. The 'rattle' went away, somewhat, but the pulley is now "loose" on the crankshaft, creating its own noise.
Should the pulley be tight against the rear bearing/washer, or loose, as it is? I'm making a 'ring' to take up the space between the pulley and washer in case the answer is "tight". If I shorten the nut so it doesn't bottom out, then the pulley will hit the tin.
-Tim
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FM Former Member
I thought the regular rattle in the motor was a bad hydraulic valve lifter. I took off the pulley for tin installation and foudn that the key between the shaft and pulley had pushed back (toward the motor) and out of the slot, bending the pulley keyway. Once it was repositioned in the key-slot and pulley repaired, I found that the retaining bolt would not snug the pulley against anthing; the bolt bottomed out. The 'rattle' went away, somewhat, but the pulley is now "loose" on the crankshaft, creating its own noise.
Should the pulley be tight against the rear bearing/washer, or loose, as it is? I'm making a 'ring' to take up the space between the pulley and washer in case the answer is "tight". If I shorten the nut so it doesn't bottom out, then the pulley will hit the tin.
-Tim
FM Former Member
If you're currently using an aftermarket aluminum pulley, that may be your problem as well. Besides the degree ring being positioned wrong (+/- 5 degree), the cheaper pulleys aren't balanced and the TBC mark is usaully in the incorrect spot and the thickness may not be sufficient.
Try installing a higher quality pulley (Gene Berg, Scat or Bugpack) and minor engine harmonics may disappear as an added bonus especially when the pulley is atleast 6lbs.
FM Former Member
I made the spacer ring and the noise is gone. Since it didn't lock up the crankshaft, I'm assuming that the pulley can be snugged against the bearing stop, or whatever is just inside of the pulley in the motor. Maybe a pulley with a longer mounting collar/shaft would be a better final solution. It might even get a little more 'style-ish"!
Thanks
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