Farm Equipment - runs full throttle

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runs full throttle

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=177312
Printed Date: 19 Jul 2025 at 2:06pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: runs full throttle

Posted By: len b
Subject: runs full throttle
Date Posted: 06 Jan 2021 at 1:27pm

Hey guys. I am new to the site so bear with me if i am in the wrong place. Restoring an Allis Chalmers B. it was really really bad when i got it .Engine needed lots of machine work so got lots of money in it .Here is the problem. got the engine rebuilt. Did the carb. On initial startup it runs wide open. double checked the carb to make sure the throttle plate wasn't in backwards. Its fine. Governor looks rather simple but i haven't had much to do with em i am having a hard time figuring out exactly how it works. I realize on throttle centrifugal force spreads the weights. fork under throttle bushes the collar back into the weights to close em. Thing is i don't really know how touchy this stuff is. For sure my weights and pins are a bit sloppy. Also i didn't have the little spring on the lincage that runs down to the carb. On hindsight this piece could be more important than i thought. Also its possible that my governor lincage could be out a tiny bit tho i have since figured out how to adjust it properly i think .I don't mind buying a new governor if it solves the problem but as i live in BC Canada by the time i get it here the damn thing is nearly 300.00.I would just like a second or third opinion before ordering. Sorry about the long winded love letter. Len

Replies:

Posted By: DrAllis
Date Posted: 06 Jan 2021 at 3:08pm

The governor weights do not make it idle. Properly adjusted throttle/governor linkage and a properly adjusted carb low idle screw make it idle. With the engine OFF and throttle lever clear back, the throttle plate on the carb should be closed tight against the slow idle screw.

Posted By: Dusty MI
Date Posted: 06 Jan 2021 at 7:05pm

Try cheap and simple first, it could very well be that missing spring. I've was hoping that someone that really knew would post.

Dusty

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917 H, '48 G, '65 D-10 series III "Allis Express"

Posted By: DrAllis
Date Posted: 06 Jan 2021 at 8:17pm

The missing surge spring isn't why it won't idle down.

Posted By: PaulB
Date Posted: 06 Jan 2021 at 8:42pm

If you have a service manual that you used when doing the overhaul, refer back to the governor section and check the linkage across the front of the motor. You may need to bend the cross arm to get it right. With the engine not running, unhook the rod back to the carburetor, it should be just a bit too short when the hand throttle is in the fastest position.

The governor does its thing to slow the engine when the weights fly outward. The spring on the top of the governor tries to overcome the force of the weights when the hand lever is moved forward. A little looseness isn't a big deal and thing should operate properly if the linkage is adjust correctly. The surge spring isn't really needed if the carburetor is the correct on for a B as the butterfly is relatively small. It was added in later years as the venturi and butterfly became larger.

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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY