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Farmall & IHC Tractors Discussion Forum
Show Parts for Model:

Re: H-4 MAGNETO PAWL SPRINGS

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John B.

05-16-2013 16:15:03
50.40.115.126



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The springs tuck them out so they engage at a low rpm. As the mag speeds up the counter weights bring the pawls in against spring pressure. If you turn the mag over by hand in the direction it is used it will turn a 1/4 turn and the pawls should engage and then the impulse spring will start to wind up, you will feel this tension build the more you turn it. Then all of a sudden the pawls let go and the impulse spring unwinds and spins the armature in the mag at a faster RPM to create a good hot spark while hand cranking the engine. The impulse spring is located behind the mag drive coupling. It's actually called "Impulse Coupling".

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Patrick HMD

05-16-2013 17:36:24
75.0.232.183



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 Re: H-4 MAGNETO PAWL SPRINGS in reply to John B., 05-16-2013 16:15:03  
So John, all this stuff about the pawls that we have been discussing about is really for the benifit of someone who is hand crank starting the tractor. So if I'm just going to be using the electric starter, then all this shouldn't be all that critical, right? Or am I wrong?

Patrick

'49M



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