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Re: Crankshaft Pulley

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Posted by TheOldHokie on November 07, 2012 at 04:59:54 from (

In Reply to: Crankshaft Pulley posted by John Schmincke on November 04, 2012 at 17:14:03:

John Smith8N said: (quoted from post at 00:11:53 11/07/12)
Hobo,NC said: (quoted from post at 01:01:44 11/07/12) I prefer'em to go on tight... They were originally made to run a pump,,, not as a replacement for a original pulley... I think the intention was to have a tight fit,,, your 9N may have had a worn snout its not uncommon....

For those that want a plug and play look for a good used OEM pulley... Are buy tools made to pull this type of replacement on the shaft...

I have posted a how to on this,,, this is what a wrench runs into regularly,,, its not someones fraught if stuff like this is a challenge for back yard Bob's...:roll:

I've got one of those handy dandy installation tools, but if the bore in the replacement pulley is actually .003" smaller than the crank snout like they're sayin', it ain't gonna pull it on there. It would go on half way and gall up, or it would crack the pulley snout. That's too much of a press fit.

One big difference in the small block Chevy balancer old Boxwrench is installing and the N tractor pulley is the keyway. The small block Chevy balancer can start on the key before you start pulling it on. The N tractor pulley just has a little slot right at the end of the pulley snout and a short key inside at the timing gear. If you can eyeball that key, then pull that tight fitting pulley all the way on the crank and have it drop dead nutz onto the key when it gets there, you're dayum good. Especially with the timing cover on so you can't see how it's going. You'd have to be magical. No backyard Bob is gonna pull that off, and very few pros, either.

Yep. Aligning the key on a fit that heavy is impossible. With .003 interference on a roughly 2" x 1.5" hub you are looking at something in excess of 4T press fit there is no way to move it once it's started. You also wouldn't need that 5/8" bolt snugged down to 150 lb-ft to keep it on :roll: The one I just skimmed measures 1.185. If my measurement is accurate according to Don's cranksahft specification that will still be a light press fit.


This post was edited by TheOldHokie at 11:18:43 11/07/12.


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