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From: <bp@www.zefox.net>
Newsgroups: rec.crafts.metalworking
Subject: Re: OT: Finding a mechanical engine fan by dimensions
Date: Sun, 28 Apr 2024 01:19:05 -0000 (UTC)
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Leon Fisk <lfiskgr@gmail.invalid> wrote:
> 
> https://www.superscoutspecialists.com/fan-blade-for-bolt-on-fan-clutch-scout-ii
> 
> Some numbers in the description for the pump and clutch it fits, likely
> nothing that matches what you have though.
> 
> Thanks for the pictures, big help in better understanding the problem
> you're having

I ended up ordering the fan (Derale 17118) from Amazon, it came in yesterday. 
Stamped "Made in USA". Didn't fit 8-)

The central hole has two diameters of centering boss, 2 3/8" and 2 5/8", each
clocked to its own bolt circle, I needed the 2 5/8" surfaces. To my surprise they 
were about .015" undersize. The hole was clearly punched, since it wasn't round,
but how it got fifteen thou undersize baffles me. Only idea that comes to mind 
is that over  the years the punch and die wore, either from wear or resharpening, 
and nobody noticed. Or, they noticed and didn't care. 

A few carefully counted strokes of a rasp got the fan to fit the clutch. 
The centering seems no worse than the blade runout so I'll try to use it.

The most impressive discovery so far is the teflon valve stem packing. I
bought it years ago to seal a flange on an espresso machine boiler, only
to discover the bolts were merely loose. It sat in the toolbox for years
until saving my bacon on this project. I'll be tempted to try it the next
time there's a leaky valve or differential cover to seal. 


Thanks to all for reading and writing!

bob prohaska

>