Crankshaft pulley re-build.

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Model T Ford Forum: Forum 2012: Crankshaft pulley re-build.
Top of pagePrevious messageNext messageBottom of page Link to this message  By Allan Richard Bennett on Tuesday, August 28, 2012 - 03:59 am:

A recent thread dealt with loose pulleys and remedies. I have never found a small pressed metal pulley, which suits the narrow snout pan, that has not had flogged out pin holes and a loose centre.

I have had to re-build four of these lately. I chuck the pulley in the lathe with the back side out and bore the centre completely out of the pulley so that the hole left is a tap in fit for a piece of heavy walled tubing. Then I cut a piece of the tubing and tap it into the pulley from the rear, leaving it a little proud. The remaining centre of the pulley leaves a small radius groove around the hole, which is filled with weld as the tubing is welded in. There is no need to weld around the inside of the pulley.

The welded pulley is put back in the lathe and the weld and tubing faced off to flush. Then the centre of the new tube is bored to the diameter of the crankshaft. You can custom fit it to your worn crank.

I drill the pin holes using an old crankshaft as a pilot for the drill. The tubing used leaves the centre of the pulley about twice as thick as the original. If you are really fussy, the front end of the new centre can be faced off true and the leading edge trimmed down a little so that it looks like the original.

I bought 6 flogged out pulleys at Chickasha in 2010 and have only two left. Next time I will have to ask if they can provide a core to re-build.

Just for interest.

Allan from down under.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Kenny Edmondson, Indianapolis on Tuesday, August 28, 2012 - 06:22 am:

Allan, if the pin holes aren't wallowed out, I use a die that I made to press over the outside of the tube to resize it. Kind of like resizing shell casings when reloading ammo. What you do should work really well also.

I don't like the looks of the aluminum pulleys and would do anything to keep from using one of those.


Top of pagePrevious messageNext messageBottom of page Link to this message  By J and M Machine Co Inc on Tuesday, August 28, 2012 - 08:41 am:

Just so you know we've been making these pulleys for a few years now and are sold through Lang's and Snyder's.
http://www.jandm-machine.com/modelTPulleys.html

We've purposely made the I.D. a few thousandths undersize so that they can be honed to fit a worn crank.


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