Farm Equipment - WD45 throttle issue

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WD45 throttle issue

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=25218
Printed Date: 25 Feb 2025 at 12:29am
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Topic: WD45 throttle issue

Posted By: jdsellers
Subject: WD45 throttle issue
Date Posted: 04 Feb 2011 at 11:57am

I've got a WD45 that was rebuilt a while back. It had WC pistons put in the 45 block, which bumped up the compression ratio. The engine runs great, but the throttle response lags then overshoots. What I mean is that when you throttle up it's delayed for a split second. Once it revs it doesn't ever want to stop and will essentially try to overrev. Now when you start to throttle down you can balance it out somewhat, but the throttle balance is delicate because it's in a different spot when the engine is loaded and unloaded (just cruising around). The only troubleshooting done was to replace the governor with a spare, but no change in function. I haven't checked the timing yet, it may be too advanced? I don't remember anything else that was done to it.

Does anyone have any suggestions on what to look for?

Thanks

Replies:

Posted By: R.W
Date Posted: 04 Feb 2011 at 1:07pm

Did the spare govener work right?

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In Search Of: 1958 Allis Chalmers D17 Diesel serial #9643D

Posted By: Orange Blood
Date Posted: 04 Feb 2011 at 1:14pm

Is something binding on the throttle rod, maybe the carb butterfly valve is sticking? But I would suspect the new govenor also?

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Still in use:
HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060
Projects: 3-U UC 2-G 2-B 2-C CA 7-WC RC WDLP WF D14 D21 210 7045 N7

Posted By: Matt MN
Date Posted: 04 Feb 2011 at 1:24pm

sure sounds like the linkages are sticking, unhook the rod from the governor arm and the carb and see if everything moves freely, also check bushing on the governor shaft that goes through the front cover

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Unless your are the lead horse the scenery never changes!!

Posted By: jdsellers
Date Posted: 04 Feb 2011 at 4:01pm

It was another old governor that was tried. Who's to say that it was any good, it just acted the same way with either one so I sort of ruled it out at the time.

Thanks for the insight guys.

I will check it out and let you know what I found.

Posted By: Denis in MI
Date Posted: 04 Feb 2011 at 4:12pm

Make sure that the linkage that comes out of the governor goes across the front of the engine and pulls on the carb moves freely my WD started sticking their a couple years ago and acted like that.

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1938 B, 1945 B, 1941 IB, 1949 C, 2 1938 WCs, 3 1950 WDs, 1951 WD, 2 1955 WD45, 1957 D-14

Posted By: DaveKamp
Date Posted: 05 Feb 2011 at 12:02am

Hmmm... how's ignition timing? What's the chances your advance weights are binding, and once it picks up enough, they swing out, and won't swing back?

Posted By: Brian Jasper co. Ia
Date Posted: 05 Feb 2011 at 12:08pm

What about governor adjustment? With the throttle lever opened wide, the link from the governor should be able to travel about 1/8" past wide open on the carb when disconnected. If the governor isn't adjusted right, it might be your problem.

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"Any man who thinks he can be happy and prosperous by letting the government take care of him better take a closer look at the American Indian." Henry Ford

Posted By: norm[ind]
Date Posted: 05 Feb 2011 at 6:40pm

i am with BRIAN start from scratch with the governor adjustments differnce in governor wear can cause your problem

Posted By: MACK
Date Posted: 05 Feb 2011 at 9:37pm

Shorten the linkage between the gov. arm and carb. by bending it down if every thing is free. MACK