Crankshaft pulley tight or loose?

Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration
Model T Ford Forum: Forum 2012: Crankshaft pulley tight or loose?
Top of pagePrevious messageNext messageBottom of page Link to this message  By Dave Fusi on Sunday, November 04, 2012 - 01:12 pm:

Hi All
My first post, so bare with me, I'm learning how to use this site & a computer too! This is my first Model T and I know almost nothing.

This morning I took my Boyer Fire truck (1921 Model TT) out for a spin around the block (practice driving it). About 1/4th mile I noticed water drops hitting me in the face. Stopped at the neighbor's driveway and found my fan belt off the crank pulley, I was able to get it back on with out tools and returned home. On arrival home found the belt off again and noticed how loose the pulley is on the shaft.
How is it supposed to be? Tight, bolted/pressed on like a modern motor or slightly loose? No point in re-installing the belt and adjusting if the problem is the pulley.
Also it has a water pump installed on it.

any help, cautions, comments, thoughts, welcome


Top of pagePrevious messageNext messageBottom of page Link to this message  By John Gelfer, Milwaukee WI on Sunday, November 04, 2012 - 01:15 pm:

It should be a tight pressed fit. The stake through the pulley just keeps it from spinning. It should be a pretty tight fit.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dave Fusi on Sunday, November 04, 2012 - 01:23 pm:

Thanks John
The "stake" is also some what loose. I'm guessing but it's for the hand crank?

Is there a fix or just replace?


Top of pagePrevious messageNext messageBottom of page Link to this message  By Stephen D Heatherly on Sunday, November 04, 2012 - 01:30 pm:

The parts suppliers sell a split aluminum pulley that will clamp tight around the crankshaft.

http://www.modeltford.com/item/3963C.aspx

Stephen


Top of pagePrevious messageNext messageBottom of page Link to this message  By Norman T. Kling on Monday, November 05, 2012 - 11:50 am:

If the pulley is not otherwise bent or distorted, you can use shimstock equally placed on each side of the pulley and tap it in place. The pin can be placed across an open vise and with a chisel and hammer hit it in the center to cause a small kink in the pin then tap it into place through the crankshaft and install the cotter pin. I have done this on one of my T's and no problem for 20 years.

I have also had a very worn and distorted pulley on another T and I replaced it with the aluminum pulley. That works well too. The rolled pin supplied with the aluminum pulley is hard to drive through the crankshaft.

Whichever method you use, tighten the belt just tight enough to spin the fan. If you get it too tight it will creep off the pulleys, but just tight enough seems to keep it centered.
Norm


Top of pagePrevious messageNext messageBottom of page Link to this message  By John Gelfer, Milwaukee WI on Monday, November 05, 2012 - 03:33 pm:

The shim on the old pulley will probably work. The split pulleys are nice, but they cost around $57. The roll pins are tight, but not that hard to drive. I got one from the hardware store to replace a well worn solid pin that was flopping around in the hole. It is working very well.


Top of pagePrevious messageNext messageBottom of page Link to this message  By John Page on Monday, November 05, 2012 - 03:56 pm:

Dave,
Let me just start out by saying I have no connection to this firm.

I remembered saving this information some time ago because I thought they looked like they made a good product.
Regards, John

Crankshaft pulleys.


Here is the link to their Web Site
http://www.jandm-machine.com/forSale.html


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bud Holzschuh - Panama City, FL on Monday, November 05, 2012 - 04:17 pm:

Dave

My pulley is a little loose (well...maybe quite loose) and I have never had the belt come off. before you do anything check the alignment of the pulley and the fan pulley. The shafts they run on must be parallel and they must be in perfect fore and aft alignment.

Good luck

schuh


Top of pagePrevious messageNext messageBottom of page Link to this message  By Steve Jelf, Parkerfield KS on Monday, November 05, 2012 - 10:08 pm:

Dave, welcome to the affliction. Here's a link I try to post for everybody new to the T world:

http://dauntlessgeezer.com/DG80.html.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Terry Woods, Katy, Texas on Monday, November 05, 2012 - 10:16 pm:

Would Lab Metal from Fastenall, fill grooves in the pulley end of a crankshaft, if applied in a thin coat with a putty knife?


Posting is currently disabled in this topic. Contact your discussion moderator for more information.
Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration