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Farmall & IHC Tractors Discussion Forum
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spark advance

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smdv806

02-26-2007 11:50:19




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I have a M that wont throttle right because there is a bunch of play in the shaft that goes to the distributor. I have a few old H parts tractors sitting around. Is the shaft interchangeable?




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RustyFarmall

02-26-2007 12:01:13




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 Re: spark advance in reply to smdv806, 02-26-2007 11:50:19  
Quite a few H parts are interchangeable with an M, but the throttle is not connected to the distributer on either one.



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smdv806

02-26-2007 12:02:47




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 Re: spark advance in reply to RustyFarmall, 02-26-2007 12:01:13  
Im not talking about the literal throttle linkage, I am referring to throttling up the engine. "Giving it gas"



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smdv806

02-26-2007 12:05:06




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 Re: spark advance in reply to smdv806, 02-26-2007 12:02:47  
When you rev it up it stutters, pops and cracks. I am certain everything else such as the carb is right. The timing is right except for I think all that play in that shaft is throwing the advance off.



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Bob M

02-26-2007 12:28:21




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 Re: spark advance in reply to smdv806, 02-26-2007 12:05:06  
If you're talking about radial play in the shaft at at the rotor end of the distributor, just a few thousandths play will have a dramatic effect on breaker point dwell. And this affects hence spark energy and timing (weak spark and timing jumping all over the place). This makes setting the correct point gap impossible and will indeed make the engine lose power, stutter, pop, etc.

Incidentally this kind of wear will not ordinarily affect spark advance unless it's worn so bad parts are hitting the inside of the distributor housing. You can verify by putting a timing light on the engine. A worn distrubutor shaft will have the timing mark jumping randomly all over the place. A bad advance OTOH will show a steady mark settled at the wrong timing value.

I believe (though am not 100% certain...) distributor assemblies - including the shaft - are interchangeable between the H and the M.

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