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Need Dimensions of Fan Sheave Spacer

Posted: Sat Jun 04, 2011 8:14 pm
by gunner66
On my friend's older mark V, the motor fan sheave is just starting to rub on the housing. We pulled it apart, and the old "thin-style" spacer was badly deformed. He contacted SS and was told that their new thicker/beefier 5/8" bore fan sheave spacer (P/N 504205, #124) was on back order. I volunteered to make him a new one. Has anyone fabricated one easily? I really need to know the following:

1. Length of spacer (my best guess is that it is around 7/16" or perhaps a little less)?

2. Thickness of the wall on the factory SS spacer?

If someone could mic a spare one they have, I sure would appreciate it. Thanks in advance.

P.S. I noticed on my own 1957 model Mark V that there is an access hole for the fan sheave set screw - cut into the bottom of the motor pan by the motor's exhaust vent slot. Perhaps I missed this in my SS maintenance guidelines, but I am adding the following to my own "every 10 hours" of operation checklist: Check that this allen screw is tight!

Posted: Sat Jun 04, 2011 11:25 pm
by JPG
I do not have one out presently, but the length is equal to the distance from the center race of the bearing to 1/8" beyond the outer face of the end casting. The fan sheave hub clears the outer face of the end casting by 1/8". The 'thicker' the better. 1/16" is more than the oem. ID is 0.625(+).

Posted: Mon Jun 06, 2011 4:22 pm
by billmayo
gunner66 wrote:On my friend's older mark V, the motor fan sheave is just starting to rub on the housing. We pulled it apart, and the old "thin-style" spacer was badly deformed. He contacted SS and was told that their new thicker/beefier 5/8" bore fan sheave spacer (P/N 504205, #124) was on back order. I volunteered to make him a new one. Has anyone fabricated one easily? I really need to know the following:

1. Length of spacer (my best guess is that it is around 7/16" or perhaps a little less)? .40&#8221]

2. Thickness of the wall on the factory SS spacer? .054”-.060” (1.4mm-1.5mm)

If someone could mic a spare one they have, I sure would appreciate it. Thanks in advance. Check your PMs.

P.S. I noticed on my own 1957 model Mark V that there is an access hole for the fan sheave set screw - cut into the bottom of the motor pan by the motor's exhaust vent slot. Perhaps I missed this in my SS maintenance guidelines, but I am adding the following to my own "every 10 hours" of operation checklist: Check that this allen screw is tight!

This set screw and the one in the Drive Sleeve are the ones I find loose.