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Farmall & IHC Tractors Discussion Forum
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Trying to get my H to idle at 450 rpm's?

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John in Ct

10-05-2005 19:24:30




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I am trying to get my Farmall H to idle at the spec (450 rpms) and can't. I can get it to about 600 rpm's and it stalls if I go much lower. My high idle speed is 1850 rpm's. The lower the idle speed I go, the richer I have to make the idle mixture screw ( now about 1/2 turn off of its seat ). I'm thinking my throttle plate isn't closing 100% because I can see some light between the butterfly and the throttle bore in a couple of places . Is 450 RPM's possible? Thanks!!

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CNKS

10-05-2005 19:37:25




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 Re: Trying to get my H to idle at 450 rpm's? in reply to John in Ct, 10-05-2005 19:24:30  
As noted in your previous post, the throttle valve is not a precision instrument. I have never put a tach on any of mine, but I can screw the idle speed screw out until it dies. I wouldn't worry about the spec. The important part is that it will idle "slow" and not hesitant when advanced immediately to wide open throttle. I imagine if you have the idle mixture screw only 1/2 turn off the seat, it may not do that. I forget whether you said you cleaned the carb, the idle circuit could be partially plugged.

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HAS

10-06-2005 04:30:43




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 Re: Trying to get my H to idle at 450 rpm's? in reply to CNKS, 10-05-2005 19:37:25  
It still could be the throttle plate. If it won't close tightly, the engine can't pull gas through the idle circuit, starving it of gas and making it stall. Make sure the throttle plate closes, adjust that, then if it won't idle slower clean the idle circuit.



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Bob M

10-05-2005 19:36:08




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 Re: Trying to get my H to idle at 450 rpm's? in reply to John in Ct, 10-05-2005 19:24:30  
John -

Good chance it's the throttle plate - it should close tightly with the idle stop screw backed out.

With the carb removed from the tractor, loosen the two small screws holding the plate to the throttle shaft (so the plate moves a bit on the shaft). Then with the idle stop screw removed, tightly close/hold the throttle by hand while retightening the screws.

The other possibility is a vacuum leak - most likely at the carb/manifold or manifold/head gaskets.

Properly adjusted and with no vacuum leaks an H should easily idle to 450 RPM or even slower.

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RustyFarmall

10-06-2005 04:32:50




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 Re: Trying to get my H to idle at 450 rpm's? in reply to Bob M, 10-05-2005 19:36:08  
Ignition timing needs to be correct also.



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