The CJ3A Page CJ3B.info

Author Topic: Flywheel Identifcation  (Read 45 times)

1 Member and 2 Guests are viewing this topic.

Offline reises58

  • Posts: 4
  • Karma: +0/-0
  • Still Plays With Jeeps
    • View Profile
Flywheel Identifcation
« on: October 24, 2026, 10:22:14 AM »
I have a Flywheel and Pressure Plate in my CJ3B that I cannot Identify. I need a new Pilot Bearing and maybe a ne Clutch Plate.

Online Rus Curtis

  • Willys Guru
  • ****
  • Posts: 342
  • Karma: +6/-1
  • Retired
    • View Profile
Re: Flywheel Identifcation
« Reply #1 on: October 24, 2026, 12:28:47 PM »
reises58,
I'll give you my .02 cents worth.  Oldtime could rattle this stuff off half-asleep. 

If you pulled the flywheel of your F-head 134, then its most likely the one for your engine.  Did you do a tooth-count on the ring gear?  (I think 129 is correct)

The good news is you can see what type clutch you have.  Auburn is printed right there on your pressure plate assembly vs. Rockford.  The only thing left to do is to verify yours is the standard 8.5" or optional 9.25" 

Since you can easily see the imprint from the friction plate on your flywheel, you can measure that (or the actual friction plate - if you still have it) or you can flip over the pressure plate assembly and measure the face (that makes contact with the friction plate (Plate and hub, driven per parts manual).

If you have a machine shop that's local, I'd recommend that path for the pilot bearing.  Simply because they can remove/install and, if necessary, ream it to fit.

Did you keep the tapered bolts?  I've seen online that there's a vendor that has new (I just reused mine).

Some will suggest that there's no need to disturb the pilot bushing if it was working.  I've been led, by others before me, while in there, replace: bushing, friction plate and throw out bearing.  Keep the old parts as emergency repair parts.  The theory behind this suggestion is to hopefully avoid having to open it up again to replace one of these other worn parts.

Be very carefull and ensure you install the friction plate correctly.  Also, if replacing the bolts connecting the flywheel to the crank, be aware they are not a standard size.  That was a costly mistake for me.   They measure 3/8" - 24 x 1 5/32" 

I got the next bigger size and could not disengage the clutch. The shop "fixed" it with a torch and there was some engine block damage that resulted.

« Last Edit: October 24, 2026, 12:38:03 PM by Rus Curtis »
'54 CJ-3B "Green Gruntt"
Bantam T3-C