Farm Equipment - WD starting at idle

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WD starting at idle

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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=21710
Printed Date: 12 Feb 2025 at 9:40am
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Topic: WD starting at idle

Posted By: JohnThomas
Subject: WD starting at idle
Date Posted: 03 Dec 2010 at 5:50am

Hopefully you guys can tell me why my WD will only start with the throttle nearly off..at very low idle when cold. It fires right up, with just a quick choke...almost instantly, but only at very low idle. I have to leave it at this low idle w/1/2 choke till it warms. If I try to throttle up too soon, motor dies. I'm Ok with this ole Gal being like this but just curious I guess.
Whole system is original..engine, 6 volt pos ground..original gen. Otherwise it runs very nicely..
Thanks.

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Life is short...Make haste to be kind

Replies:

Posted By: Butch(OH)
Date Posted: 03 Dec 2010 at 6:11am

You have a lean probem that could be from any one of several causes. The carb could just bet set on the lean side and all it needs is a partial turn on the jets. Or your choke may not be working correctly. You could have leaks at the carb or manifold gaskets. Pulll the air cleaner hose and make sure the choke plate is closing completely. Rust, dirt and linkage problems can prevent it. That being said and not knowing your experiance, It is not unusual for a tractor to be cold blooded in the winter and need manipulaton of the choke to keep it going. Our current fuel helps not a bit as they were not designed to operate on 10% alcohol. It is not unusual to need a quick additional choke application to keep it from dying when the throttle is applied before it has warmed up a little as a matter of fact if it does not need a bit of choke manipulation when cold your likely running too rich when warmed up but neither should you need to go back in the house and eat breakfast before you can move it. I would open the main jet up some, maybe 1/4 to half turn. That will help a lot, you might have to set it back in the summer but thats why there are adjustments

Posted By: skipwelte
Date Posted: 03 Dec 2010 at 12:52pm

Ive got a WD 45 the same way John, it will start below 0 with not throttle and not much choke, it you give it a little throttle it wont start, dont let it die cause it will be a bearcat to start then. Ive 8 45s, this is the only one that way. I think the compression is down, cause it wont suck gas if the throttle plate is open, once ya get it running it fine for what i do.

Posted By: Stan IL&TN
Date Posted: 03 Dec 2010 at 2:09pm

Need three things for it to run.

1. Gas

2. Ignition

3. Compression

I'm thinking it's number one.

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1957 WD45 dad's first AC

1968 one-seventy

1956 F40 Ferguson

Posted By: JohnThomas
Date Posted: 03 Dec 2010 at 3:20pm

Compression?? Hmmm... Thanks Guys...but...
I recently had to drag a 30 inch + log 13 feet long up out of a hole with a number of stub limbs on it. The ole girl just dug in and pullled just like the early '50 years. Plenty of torque. Actually suprised me cos I had to smile as we walked up out of there. It really does still have good power. I thought lost compression was lost HP.
And yes, if it don't stay running , like Skip's does/doesn't, I may as well go do something else for awhile.
Carb is original..new B & B kit in it tho.

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Life is short...Make haste to be kind

Posted By: Steve in NJ
Date Posted: 03 Dec 2010 at 3:49pm

I'm wit Butch on that one. Usually, when the carb is on a bit of the lean side, (either from adjustment or vacuum leak) it takes a while for the engine to respond until the engine builds up some cylinder head temp. That cold dense air makes a big difference in the way an engine runs. You didn't say which model carb you have on it, (Zeniths were popular on the WD) but if your carb is equipped with an enrichment adjusting needle, I would fatten up the mix a little bit and see how the engine reacts to your adjustments. Inspect the choke rod stop screw to make sure its tight and the rod is not just sliding in the stop and not pulling the choke blade closed...
Steve@B&B

Posted By: Stan IL&TN
Date Posted: 03 Dec 2010 at 9:55pm

OK John since you left out some details I went back and changed my answer. LOL

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1957 WD45 dad's first AC

1968 one-seventy

1956 F40 Ferguson

Posted By: roughstock
Date Posted: 04 Dec 2010 at 1:47pm

My WD has been doing the same thing since it got cold. I tried shutting the radiator shutter but its stuck. I used some welding blanket to cover the grill to help her warm up. That seem to get her running after cold starts. A guy near me has a shroud encasing his muffler and it pipes to the air intake on a Farmall M. Any one else use or ever see anything like that? I thought about rigging up something like that for the winter. Once the ol' gal warms up she runs like a champ so I would think a fresh air damper would be necessary.

Brian