Re: OT: Finding a mechanical engine fan by dimensions

On 4/25/2024 5:18 PM, bp@www.zefox.net wrote:

Snag <Snag_one@msn.com> wrote:

>
   I was visualizing a puck with the correct features for the water pump
on the back and the correct features for the fan/clutch on the front .
Maybe an inch thick , maybe a bit more ... unless that puts too close to
the radiator .

 The clutch fits the water pump correctly. The fan needs to fit _over_ the
clutch mounting hub and mounts to the back surface of the clutch body.
 Unfortunately the center hole on the fan is too small to fit over the
clutch hub and the fan bolt circle is too small to fit the clutch. Here
are a few images, hopefully they'll clarify the topological problem:
http://www.zefox.net/~bp/scoutfan/
 The obvious way to use the fan and clutch that I have together would be to
bore out the ID of the fan and re-drill the bolt circle. That wouldn't
be impossible if I had an 18" swing lathe. I have only a 10" (maybe 11"
over bed) lathe, but taking the fan apart, doing the machine work and
riveting it back together is a lot of work and not easy to get right.
 At this point all fingers (and other appendages!) are crossed in hopes
the fan on order will fit the clutch on-hand.
 Thanks for writing,
 bob prohaska
.
 

   OK , if I understand correctly the 4 slot flange bolts to the pump and the fan bolts to a surface that is hidden by the fan  . Got a mill and a boring head ? Is the current fan's base circle diameter big enough to drill the bolt pattern of the new clutch ? I could adapt that fan to that clutch in my shop .
--
Snag
  "They may take our lives but
they'll never take our freedom."
  William Wallace