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Allis Chalmers Discussion Forum
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carburator screw

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jrlii

02-07-2005 15:01:37




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After the ice storm a while back I had trouble getting my 170 (gas) started and pulled out the T-handled screw in the bottom of the carburetor to see if it was getting gas. The screw has kind of a blunt taper on the end.

I guess I screwed it in too far since it wouldn't start at all. . . After trying a number of other things I started backing it out and the tractor started running but stalled when the governor called for more throttle, so I turned it out some more.

I'm sure that the repair book would tell me what this screw does, but I haven't yet obtained one.

My theory is that it sets the fuel level the float allows in the bowl, but that is just a guess.

The only carburetor I've fooled with before was the big one-barrel on my 1970 BMW, 25+ years ago. . .

TIA!

- John.

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JMS/MN

02-07-2005 15:51:59




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 Re: carburator screw in reply to jrlii, 02-07-2005 15:01:37  
The fuel level in the carb is set by the bend of the float- it controls the inlet valve. Sounds like you messed with the load valve. Like the other poster said, the idle and load valve settings usually start at about 1 to 1 1/2 turns open. That's why we say to get the manuals to learn how to make the settings.



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patex

02-07-2005 15:34:45




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 Re: carburator screw in reply to jrlii, 02-07-2005 15:01:37  
Not familiar with 170 however it sounds like you been messing with either the idle jet or high speed jet adjustment. Most basic adjustment calls to turn in to stop (don't over tighten or it will burr seat)then turn out for 1 to 1&1/2 rounds.



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