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Farmall & IHC Tractors Discussion Forum
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F12 Cranking

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Kevin Hood

04-13-2005 16:15:38




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I've been beating my head against a wall trying to figure out how the impulse works, then someone said, you know it's suppose to impulse two times per revolution. Mine only impulses once per rev. I geuss I should crank on the same stroke that impulses. That may make it a little easier to crank until I can fix it.

Kevin




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KevinH

04-14-2005 00:38:04




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 Re: F12 Cranking in reply to Kevin Hood, 04-13-2005 16:15:38  
Thr F4 on an F12 should impulse every time the hand crank is at the top and the bottom if you are turning completely through without removing the handle. There are several different impulse couplings for the F4 and I agree with Cowman about one of the pawls or "dogs" nor engaging. Might try pulling all 4 plugs and sticking finger over hole and listen for impulse every time you feel blowby.**NOTE**Ground mag out before doing this to avoid damage to mag or self. If its every-other one EVERY TIME, then it's time to remove the impulse coupling and investigate. If you're lucky, (I'm usually not) it may just need a goog cleaning. Good luck ,Kevin

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Kevin Hood

04-14-2005 02:46:26




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 Re: F12 Cranking in reply to KevinH, 04-14-2005 00:38:04  
I've done that & it always impulses when #2 & #3 pistons are at the top, only. I geuss Until I can get this fixed, I will need to crank when #2 & #3 are on compresion stroke.

Thanks Kevin Hood



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Larry Jensen

04-13-2005 19:49:38




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 Re: F12 Cranking in reply to Kevin Hood, 04-13-2005 16:15:38  
Kevin you may be forgeting that one revolution of the engine is only a half revolution of the mag



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Nebraska Cowman

04-13-2005 17:26:00




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 Re: F12 Cranking in reply to Kevin Hood, 04-13-2005 16:15:38  
most inpulse couplings have two pawls that catch to make it work. maybe one of yours is stuck so it only works half the time.



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KevinH

04-13-2005 16:31:49




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 Re: F12 Cranking in reply to Kevin Hood, 04-13-2005 16:15:38  
Also, what mag is on yours?



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John M

04-13-2005 16:29:26




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 Re: F12 Cranking in reply to Kevin Hood, 04-13-2005 16:15:38  
What do mean by revolution?



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Kevin Hood

04-13-2005 16:39:27




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 Re: F12 Cranking in reply to John M, 04-13-2005 16:29:26  
It's a F4 & when I say One revolution, I mean the crank. I was told that it should impulse on every compression stroke.

Kevin



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