Technical 4” crank pulley 59 block

I just got my engine back from the machine shop and I’m wondering what crank pulley goes on this engine?

it’s a 1939 block with a 4” crank.

A friend of mine gave me a few pulleys to try, but all of them seem too long. My question for this forum is, was the engine supposed to be built with the pulley on the crank or does the pulley go on after the build?

it looks like there is a collar on the front of my crank that the rope seal was built around, is this a permanent part of the 4 inch crank or was this supposed to be taken off and the pulley put in its place?

The crank sticking out of the timing cover is 1 3/4” inches long.

Was this engine built wrong?

 

Can I simply cut down the pulley snout l.”, insert a spacer, and call it good because it has a key way to keep it in place?

thanks for any help. J

 

I cut down one of those duals and it looks good. Newc

 

The collar is a post 49 piece, just like the crank. The pulley you have is a 48-ish. You can pull the collar off and the long snout of the 48 pulley will take its place. Easy peasy.

 

thanks for the advice but do I néed to drop the oil pan and remove the timing cover to do that swap?

 

Depends on if you can get a grip on the collar to slide it off. Might be able to.

 

You are looking for the 99A-type single belt pulley. The spiral "sleeve" is part of the 99A pulley and the 8BA type sleeve is not needed when it's used in a 59AB.

Works perfectly with what you are trying to do.

 

If it was mine, I'd pull that 49-53 collar off and then cut the front pulley off of the 2-sheeve pulley you showed and then you'll have a pulley that fits. If you're running a rope type seal, then you can use the pulley (modified) as-is. If you're using an aftermarket doughnut type rubber front seal, then you'd want a "speedy sleeve" added to the back of that pulley - to give a smooth surface for the rubber seal to ride on.

Here is a picture of one that I cut the front off of on my lathe:

 

Thank you all for your advice. I cut the pulley snout down and it fits perfect and the belts align.

 

Sweet!

 

So what are you going to do with that extra front pulley? Do you need it for a fan setup?

 

Correct. Fan. I’m running a 3x2 with offset alternator. the plan is to drop the fan down from the intake stud.

 

While you have the heads off, you should add a TDC pointer and mark on the front pulley - then you'll be able to use a "dial back" timing light and know where your timing is at. I usually take a dremal and make a physical mark in the front pulley, then some white paint and then make a hard pointer off of a timing cover bolt.