[Farmall] O-12 flywheel

[Jim Becker]

The original in an O-12 was normally an over center clutch.  Is that what is 
still in it?

Jim Becker        jim.becker at verizon.net

----- Original Message ----- 
From: "Michael Miller" <sweetcorn70 at hotmail.com>
To: "Farmall/IHC mailing list" <farmall at lists.antique-tractor.com>
Sent: Saturday, November 26, 2005 6:12 AM
Subject: Re: [Farmall] O-12 flywheel


Karl,


Sounds like quite the setup!!!   I wonder if the original clutch was 
replaced with an oversized unit and that is why it won't come out?


You work on any Oliver 70's lately?

Mike
  ----- Original Message ----- 
  From: Karl Olmstead<mailto:olmstead at ridgenet.net>
  To: Farmall/IHC mailing list<mailto:farmall at lists.antique-tractor.com>
  Sent: Friday, November 25, 2005 11:07 PM
  Subject: [Farmall] O-12 flywheel


  I finally pulled the last tractor out of my shop and parked it in my new
  storage building.  So there's lots of room in the shop to work on 
tractors.

  First project is an O-12 that's already in halfway decent shape.  Engine 
is
  not stuck, and it even has some compression.  But I'm still going to pull
  the engine, put it on a stand, and check it out.

  The O-12 is a considerably different beast from the F-12.  It has a full
  frame instead of two C-channels to hold the front and rear of the tractor
  together.  Instead of the wide open area behind the clutch, O-12's clutch
  housing is a large casting which connects engine to transmission.

  I split the tractor today, and ran into a problem that I'm still having a
  tough time believing. The clutch housing unbolts from the transmission, so 
I
  wound up with the engine, front frame and clutch housing as one half of 
the
  tractor, the transaxle as the other half.  Quite straightforward.

  Removed the clutch pressure plate and clutch, then pressed the flywheel 
off
  the crankshaft using the two 1/2" threaded holes provided for that 
purpose.
  Then I tried to remove the flywheel from the clutch housing.  And tried, 
and
  tried and tried....

  It appears that the flywheel is 'captive' inside the clutch housing.  The
  opening at the top (normally covered by the steering gearbox) is at least
  half an inch narrower than the flywheel, so the flywheel can't be lifted 
up
  and out.  And the two bushings cast into the clutch housing in which the
  clutch shaft turns stick out so far into the interior of the clutch 
housing
  that the flywheel can't come out the rear opening where the transmission
  used to be.

  This has some serious ramifications, because the engine is bolted to the
  clutch housing from inside, and two of the bolts are hiding behind the
  flywheel.  I finally got them loose, working one-handed in the little gap
  between the back of the engine and the front of the flywheel.

  When everything is cleaned up and primed, I'll have to remember that I 
need
  to put the loose flywheel into the clutch housing before I lower the 
engine
  back into the front frame.  What an awkward setup!  This is one of the
  dumbest designs I've found in IHC equipment; it looks like something John
  Deere Company would have done.

  Other than that, I'm having fun.  70 degree weather, a wide open shop, and
  an O-12 to rebuild.... who could ask for more?

  -Karl