[Farmall] F-12 carb kits

[oldiron62 at gmail.com]

 Karl  we have an F12 that I am having trouble with the timing.. I can get 
it to run on 2 cylinders or less. I bought a fresh mag F 4 and this thing is 
about to drive me nuts. I bought this off some amish and they had been 
working on the mag and it was not running for them either. Any info ideas on 
this will be greatly appreciated.
Thanks
Kevin Mosier


----- Original Message ----- 
From: "Karl Olmstead" <kolmstead4 at msn.com>
To: "Farmall List" <farmall at lists.antique-tractor.com>
Sent: Wednesday, May 20, 2009 10:14 PM
Subject: [Farmall] F-12 carb kits



Just thought I'd warn my friends.  The Valu-Bilt carb kit  for the A-10 IHC 
carburetor used on the F-12 offered by various vendors including the Fordson 
House, Central Tractor (back when it was in operation) and others, has a few 
problems.  Part number is 2253-020.  Last time I talked with Rice Equipment, 
they didn't offer a kit, just parts, and this may be why.

The gasket set is OK, as is the float needle and seat.  The problem is with 
the replacement throttle shaft.  There's simply no way that the part 
provided in the kit can be used in an A-10 carburetor.  The idle adjustment 
screw and the full throttle stop will not engage the ear provided on the 
replacement throttle shaft.

After I discovered the problem, I emailed Skip at Fordson House, and he got 
back to me within hours.  He said that the IHC part is not available.  What 
wears out on the throttle shaft is the actual shaft, which passes through 
the carburetor and supports the throttle butterfly.

Both the original IHC part and the Valu-Bilt replacement throttle shaft are 
assemblies, held together with a pressed-in pin.  What Skip does is press 
out the pin, and replace the original IHC throttle shaft with the VB unit. 
Unfortunately the pin orientation is different, so you have to put the new 
assembly in your carburetor, run the throttle to full open, align the 
outside portion of the throttle shaft with the full throttle stop in the 
carb, mark the shaft, and drill a new pin hole.

In other words, it's a real pain, but at present, it is the only way to 
obtain a new throttle shaft.  I feel really lucky that when I tore down ten 
A-10s recently, I didn't throw out the old throttle shafts.  Turns out, I 
need them!

I did rebuild an A-10 last weekend, and the O-12 I put it in runs 
flawlessly.  Couldn't ask for more.  But the tractor still won't start by 
hand crank.  Lights off in less than twenty feet of pull.  In fact, I set up 
a short ramp to start it, and that works fine.

-Karl

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