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automatic choke on 51B

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phil

01-22-2002 14:09:24




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My 51 B has the automatic (semi) choke. I removed the air intake line & watched the choke. It is closed before the tractor is started. I can push a screwdriver blade in & push it open it against the spring. After starting & warming up, the choke blade is about 1/2 closed with the tractor running. At full throttle, the choke is still about 1/3 closed, fluttering in the air stream. I can push it open with a screwdriver, & it affects the engine, it smoothes out. How does the choke work & how do I adjust it? Thx

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Clooney

01-22-2002 14:58:17




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 Re: Help - automatic choke on 51B in reply to phil, 01-22-2002 14:09:24  
Phil, that choke isn't actually an automatic choke with a temperature reacting bi-metallic spring, it is just a manual choke with a spring loaded plate to allow air to enter after starting, it is used with the manual control just like a any other manual choke& must be manually opened after starting & warm up.



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phil

01-22-2002 15:39:51




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 Re: Re: Help - automatic choke on 51B in reply to Clooney, 01-22-2002 14:58:17  
Thanks. With the engine off, the choke plate on mine is closed when the manual control is in the 'open' position. Is this normal or does the spring need to be adjusted?



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Clooney

01-22-2002 15:49:45




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 Re: Re: Re: Help - automatic choke on 51B in reply to phil, 01-22-2002 15:39:51  
Phil, that is not normal, sounds like the choke disk is flipped over or installed wrong or the spring is wound wrong.
~Is the choke lever that the rod goes in pointing up & does the lever move to the rear to close choke?



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phil

01-22-2002 16:03:55




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 Re: Re: Re: Re: Help - automatic choke on 51B in reply to Clooney, 01-22-2002 15:49:45  
Yes, the lever points up & the lever moves to the rear when I pull the choke button. With the engine not running & the choke lever in the 'open' position, the choke disc is closed. I can push rearward on the bottom of the choke disc & push it up to a horizontal position (open). If I start the engine, the air stream pushes the choke disc toward 'open' but only about 1/2 way. It seems like the spring action is in the right direction but that it is about 1/4 turn too 'strong'? Maybe it's clocked a half turn off?

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buckeye al

01-25-2002 09:09:36




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 Re: Re: Re: Re: Re: Help - automatic choke on 51B in reply to phil, 01-22-2002 16:03:55  
Take the cap off of the choke lever assembly exposing the choke spring and the two pins that operate the choke. Note the positions of the two pins. One is in the choke lever (the base plate that the choke rod is connected to) and the other is crosswise in the end of the choke shaft. With the choke rod pushed forward (choke off) the pin in the choke lever should be on top of the crosswise pin in the choke shaft thereby holding the choke open. What you describe sounds to me like these pins have passed each other & the spring is rotating the choke shaft clockwise closing the choke even with the lever in the OPEN position. If both pins are straight and not worn loose in their mounting holes, you can usually work these pins back into proper register by removing the shoulder bolt, friction washers & spring that hold down the choke lever. With this bolt removed you can usually work the pins past each other by tilting the top of the choke lever towards the carb & rotating the choke shaft and plate counter clockwise winding the spring up a bit more until the lever pin & the shaft pin pass each other and the spring holds them against each other. The upper end of the cross pin (choke closed) should be in FRONT of the lever's pin. The spring should always try to rotate the choke shaft clockwise but be stopped by the lever's horizontal pin in all but the full choke position. Replace the shoulder bolt, washer & spring and the choke should work properly.

Let us know what you find.

Later.

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phil

01-25-2002 13:57:48




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 Re: Re: Re: Re: Re: Re: Help - automatic choke on 51B in reply to buckeye al, 01-25-2002 09:09:36  
Buckeye, you're exactly right. The tip of the pin that goes thru the choke shaft was worn & allowed the pins to cross. I took the choke plate out, reset the splined pin in the lever & put a new backing washer behind it. And I drove the pin out of the shaft & reversed it so that the fresh tip works the choke. Works much better, thx.



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buckeye al

01-25-2002 14:58:04




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 Re: Re: Re: Re: Re: Re: Re: Help - automatic choke on 51B in reply to phil, 01-25-2002 13:57:48  
I own a 51 too & enjoy that little but tough tractor every time I use it.

Glad your back among 'em.

Later.



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