Farm Equipment - High idle

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High idle

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=194675
Printed Date: 22 Aug 2025 at 1:26pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: High idle

Posted By: Nick-1998
Subject: High idle
Date Posted: 17 Apr 2023 at 7:09pm

D14, ran great all winter moving snow and loading sander drove home pulled into garage for maintenance, changed oil, new muffler replaced studs for manifold took tank apart cleaned out removed the valve in glass bowl, put everything together again and now fires up but runs high full choke at what should be idle choke off dies. Turn to full throttle can turn choke off no problem. Replaced needle and seat new gaskets and everything. Throttle valve works as it should. Tried adjusting carb makes no difference. I am at a loss any help would be much appreciated

Replies:

Posted By: DrAllis
Date Posted: 17 Apr 2023 at 7:34pm

Sorry. Your description as to what is going on is poor in my opinion. Was the tractor OK fine before you worked on the carburetor ??? or is it the same as it was before you worked on the carburetor ?? or did you just buy this tractor and it's always been like this ??

Posted By: Nick-1998
Date Posted: 17 Apr 2023 at 7:38pm

Sorry updated

Posted By: DrAllis
Date Posted: 17 Apr 2023 at 7:47pm

So, you removed the carburetor AND manifold together ? to replace manifold studs ?? and you installed new manifold gaskets ?? I'm wondering if you have an intake manifold gasket air leak ?? spray some ether or WD40 around the two intake manifold gaskets (engine running) to see if they suck anything in.

Posted By: Nick-1998
Date Posted: 17 Apr 2023 at 7:53pm

The intake manifold and exaust manifold are in one peice, I had to do some welding for the new muffler I figured it would be best to remove all together

Posted By: steve(ill)
Date Posted: 17 Apr 2023 at 8:07pm

Yes Nick... the intake and exhaust manifold are made into one.... If the tractor ran GOOD before you removed the manifold, then what has changed since then ? Thats why Dr said it my be the manifold gasket.. Was it torn ? Chunk gone ? Installed new ? .... that may be the first place to look.

make sure the throttle rod to the front end from the carb moves back and forth easy.. Maybe it got bent, in a bind, or dragging on a mounting bolt ?

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Like them all, but love the "B"s.

Posted By: steve(ill)
Date Posted: 17 Apr 2023 at 8:18pm

so are you saying with the throttle lever in the idle position, the engine runs a HI IDLE ... and when you move the throttle lever to the FULL throttle position, the engine still runs at HI IDLE ? ........... sounds like the throttle arm on the carburetor is stuck open ??

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Like them all, but love the "B"s.

Posted By: DrAllis
Date Posted: 17 Apr 2023 at 8:57pm

Whenever installing the intake/exhaust manifold assembly, ALWAYS snug the front and rear stud nuts first !!! This will square the manifold to the cylinder head. Then, slowly tighten the other nuts by alternating so the manifold stays square !!! If the manifold isn't square you are sucking air at the intake runners. Old gasket(s) probably a bad idea.

Posted By: ryan(IN)
Date Posted: 18 Apr 2023 at 5:54am

Did you remove the little pipe plug above the carb from the old manifold and install in new?? I forgot about the plug when I changed mine years ago and would only run at full idle.

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ryan
1984 8070 FWA,1979 7060,1975 7040,1971 190,1960 D-17D,1957 D-14, 196? D-19G, 1975 5040,1971? 160,1994 R62