Farmall H Governor hunting at high idle.

Farmall H, HV & Super H, 300 & 350, 1939-1958
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MiCarl
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Tractors Owned: 1944 Farmall H
1948 Farmall Cub
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Location: Livonia, MI

Farmall H Governor hunting at high idle.

Postby MiCarl » Sat Oct 19, 2019 7:36 am

I recently purchased a 1944 H that I have lent to an educational farm where I volunteer. The H is mainly used to pull tour wagons.

After a tune up, including adjusting the fuel mixtures and timing it ran great at all speeds. Last weekend I found that it wasn't making the speed it should. I put a tachometer on it and found that the no load high idle was only turning 1400 rpm.

I adjusted the governor for 1825 no load high idle. The problem is at anything over about 1400 rpm the governor hunts. The mixture screw doesn't seem to affect the hunting until I get it leaned out to where the governor can't get the speed to 1825 rpm. It does settle down quite a bit with a decently loaded wagon.

Any thoughts on how I should tackle the problem?
1944 Farmall H
1948 Farmall Cub
1994 Speedex 1631

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Slim140
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Re: Farmall H Governor hunting at high idle.

Postby Slim140 » Sat Oct 19, 2019 11:11 am

May need to take the carb apart and clean it. May have some trash in it.
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tst
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Re: Farmall H Governor hunting at high idle.

Postby tst » Sat Oct 19, 2019 11:50 am

check for lack of fuel/restriction

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MiCarl
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Posts: 560
Joined: Sat Dec 16, 2017 8:28 am
Zip Code: 48154
Tractors Owned: 1944 Farmall H
1948 Farmall Cub
1994 Speedex 1631
Circle of Safety: Y
Location: Livonia, MI

Re: Farmall H Governor hunting at high idle.

Postby MiCarl » Sat Oct 19, 2019 6:17 pm

I don't think it's a dirty carb or fuel restriction - it throttles up and pulls a load fine up a good grade. It's under no-moderate load that the thing hunts.

Before today's runs I retarded the timing a bit and reset the mixtures. That seemed to help but still not 100%.
1944 Farmall H
1948 Farmall Cub
1994 Speedex 1631

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Rick Spivey
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Re: Farmall H Governor hunting at high idle.

Postby Rick Spivey » Sun Oct 20, 2019 6:45 am

In my experience "hunting" at higher speed means fuel starvation. I agree with the guys above, better check the cleanliness of the main jet and discharge tube.
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MiCarl
501 Club
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Posts: 560
Joined: Sat Dec 16, 2017 8:28 am
Zip Code: 48154
Tractors Owned: 1944 Farmall H
1948 Farmall Cub
1994 Speedex 1631
Circle of Safety: Y
Location: Livonia, MI

Re: Farmall H Governor hunting at high idle.

Postby MiCarl » Mon Oct 28, 2019 6:25 pm

UPDATE:

The issue has self resolved. My best guess is there were deposits on the governor shaft in an area that was unused at lower rpm and it was making the weight response sluggish. Then some use scoured the deposits.

I've put the timing back to normal and while the governor will surge a couple times if I snap the speed control to high idle with no load it is otherwise rock steady regardless of engine load.
1944 Farmall H
1948 Farmall Cub
1994 Speedex 1631


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