Farm Equipment - WD 45 motor surging at idle down

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WD 45 motor surging at idle down

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=47730
Printed Date: 23 Jun 2025 at 2:33am
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Topic: WD 45 motor surging at idle down

Posted By: Iowa_Allis
Subject: WD 45 motor surging at idle down
Date Posted: 22 Mar 2012 at 6:38pm

My 45 surges/pulses after a quick idle-down. Otherwise it runs great. What causes this? Timing?

Replies:

Posted By: Iowa_Allis
Date Posted: 26 Mar 2012 at 11:02am

Bump.

Anyone?

If I have it at full or 1/2 throttle and back it off to 1/4 throttle or so very quickly it will not idle smooth and surges.

Posted By: Ken McGregor
Date Posted: 26 Mar 2012 at 4:51pm

Sounds like either a problem with the governors or perhaps if you are lucky, the spring attached from the block drain cock to the throttle rod is missing/broken/not strong enough to stop the surging.

Just a couple of thoughts for what it's worth. It's probably worth what it cost you anyway;>)))

regards,
Ken McGregor

Posted By: Mike56073
Date Posted: 26 Mar 2012 at 6:31pm

I would check to see if the throttle shaft seal is worn. Spray some carb cleaner where the throttle shaft goes into the carb, and see if the problem goes away. If it does, plan on rebuilding the carb, be sure to get a kit with a new throttle shaft.

Posted By: Iowa_Allis
Date Posted: 27 Mar 2012 at 8:05am

Thanks guys. I'll check these out.