[Farmall] Hard starting F12

[kevin hood]

Thanks for the info, Karl. The fellow I bought it from said he put a fuel 
pump kit in. You can throw the gas to it & it takes it fine (no hesitation). 
When I get back on it, I think I will start with the ignition system. I'll 
let ya'll know what I find.

Thanks,
    Kevin

>Karl Olmstead <olmstead at ridgenet.net> wrote:
>As other knowledgable F-12 fans have noted, the F-12 is not quite as simple
>as you'd expect. And every system has to be performing well in order for
>the tractor to hand start.
>
>All you can do is go through them one at a time, systematically.
>
>Carburetor:
>Pretty much the same as any other carb, except for one item. There's an
>1/8" tube that runs from the lower portion of the carb up into the upper,
>and it has a tiny orifice in its tip. This tube tends to stick to the upper
>part of the carb and get broken off. I can't recall if Rice has a
>replacement or not.
>
>Fuel Pump:
>Virtually always needs rebuilding. Rice can supply a kit. Critical to the
>starting of your tractor, since it is needed to lift the fuel up to the
>carb.
>
>Magneto:
>The impulse MUST be working, or the engine won't start. You should hear a
>loud click or clank each time you turn the starting crank. A penetrating
>oil will often free up the impulse, but don't use WD-40; it turns gummy 
>over
>time. If the engine revs freely when you bump the throttle up, the timing
>is probably set about right. If the engine seems to 'labor', the timing is
>retarded. The timing called out in the I&T manual is too far retarded for
>use with modern gasoline.
>
>Valves:
>0.013" gap between rocker arm and valve, same as the gap for the magneto
>points.
>
>As Robert mentioned, the F-12 engine starts out with pretty low 
>compression,
>and you can't afford to waste any of it through leaky valves or rings.
>
>There's a straight slot screw in the side of the carb which gives access to
>the venturi. On difficult to start F-12s, I squirt Wal Mart $0.79
>carburetor cleaner in through that screw hole. Burns like gasoline, won't
>destroy an engine like ether (starting fluid) will.
>
>Good luck!
>
>-Karl
>
>
>
> >I just bought a F12 & do not know much about them. I have a hard time
> >starting it. It runs good once it starts. I don't know if it's me or the
> >tractor needs a little tuning. I have heard some people say theres will
> >start on the first few pulls, is this true? What is the best service 
>manual
> >for me to buy? Thanks for any help!
> >
> > Kevin Hood
>
>
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