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Hand crank rachet?

Farmall Super A, AV, 100, 130, & 140 1939 - 1973
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patricktjms
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Joined: Fri Nov 10, 2023 8:40 am
Zip Code: 47302

Hand crank rachet?

Postby patricktjms » Thu Nov 16, 2023 9:01 pm

Hi! I have a 1940 Farmall B that I am getting back to running condition. When turning the engine over with the hand crank to adjust the valves, there is a big "clack" rachet sound at 2 exact points in a revolution. Is this normal for a hand crank tractor or is something stuck? It has electric start also but I havent tried it out at this point.
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Barnyard
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Re: Hand crank rachet?

Postby Barnyard » Thu Nov 16, 2023 9:12 pm

Magneto impulse turning over.
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patricktjms
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Zip Code: 47302

Re: Hand crank rachet?

Postby patricktjms » Thu Nov 16, 2023 9:18 pm

So does this sound go away once it fires? Seems like it would be really bad at idle speed. Lol
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staninlowerAL
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Re: Hand crank rachet?

Postby staninlowerAL » Thu Nov 16, 2023 10:11 pm

If the noise is from the impluse coupling as Bill suggested when the engine speed reaches a certain rpm the impulse disengages. You can read up on how the magneto works on a cub in the service manual GSS 1012. A FARMALL B would operate in a similar manner. JMHO Stan
Stan in LA (lower AL)
USAF & Reserves, Reg ARMY, ARMY NG (AL)
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patricktjms
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Re: Hand crank rachet?

Postby patricktjms » Fri Nov 17, 2023 7:45 am

Thanks!
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Eugene
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Re: Hand crank rachet?

Postby Eugene » Fri Nov 17, 2023 10:23 am

patricktjms wrote:So does this sound go away once it fires? Seems like it would be really bad at idle speed. Lol

Impulse coupling, the snap sound, is supposed to drop out/stop at about 250 engine RPMs. When the impulse coupling drops out, the magneto goes from firing at TDC to full advance.
I have an excuse. CRS.
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