Farm Equipment - warmed up WD45 loses power

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warmed up WD45 loses power

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=7856
Printed Date: 31 Oct 2025 at 7:10am
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Topic: warmed up WD45 loses power

Posted By: Charlie(IA)
Subject: warmed up WD45 loses power
Date Posted: 09 Feb 2010 at 11:43am

Poor ol' gal... She's seen a lot of use... and I'm ashamed to admit, some neglect.

I noticed a radiator leak late this fall... stop leak fixed it fer now.

Now though, once she warms up, she starts to die under load... If I slow her down to idle she'll keep running and then can take off again for a little bit... then she'll start to kill again under load (pushing snow with an oxnard blade)...

It's almost like a fuel starvation problem... that's the first thing I'm gonna check. Did notice the carb icing up a bit, but I'm used to that and so is she... I know the float is sticking and not shutting off fuel flow to carb... and I don't think it's sticking closed so as not to allow fuel flow...

Any other thoughts? It's a WD with some other engine in it... a CA maybe... I haven't yet found the engine serial number (at least not where it's supposed to be).

Replies:

Posted By: Brian Jasper co. Ia
Date Posted: 09 Feb 2010 at 12:48pm

Check to make sure you have good fuel flow to the carb. Does pulling the choke out help for a little bit before it wants to die? Junk in the tank blocking off the fuel flow could be what's going on.

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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: Lil bull
Date Posted: 09 Feb 2010 at 1:02pm

I had the same problem on Sat. while trying to push snow. Had to run the choke completely closed just to get it to the shop. I pulled the carb off and cleaned it inside and out and now it runs great. Had crud in the carb so I am assuming it was blocking an internal passage.

Posted By: Bill Long
Date Posted: 09 Feb 2010 at 4:20pm

Don't forget to check the flow from the gas tank. We had a B with a rag in the tank that stopped from time to time when the rag restricted the gas flow to the carb. Also, you may want to check the settlement bowl for restricted flow there too.

Good Luck!

Bill Long

Posted By: CTuckerNWIL
Date Posted: 09 Feb 2010 at 4:50pm

Icing on the carb can cause those symptoms. I made a shield out of some scrap tin to put from the frame rail to the hood to hold some heat in around the carb and it helps. If you let it idle till some heat builds up in the manifold that will help reduce the icing also. The faster the engine runs the more the carb will ice up.

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http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF

Posted By: jrjuday
Date Posted: 09 Feb 2010 at 7:58pm

Condensor.

Posted By: J D (Ont)
Date Posted: 09 Feb 2010 at 8:33pm

The choke plate in my WD45 came loose from the linkage once and was partly on when I thought it was off. Did something similar to what you describe.

Posted By: DSeries4
Date Posted: 09 Feb 2010 at 9:29pm

I would have to say fuel restriction. My D14 had the same problem in the summer. I found a ladybug in the outlet of the strainer.

Posted By: Dave(inMA)
Date Posted: 10 Feb 2010 at 6:27am

Had a similar issue on one of my tractors. Though it should have had nothing to do with whether the engine was warm or not, the tractor always started and ran okay for a while, then would lose power and run poorly. Found the foil seal from a jug of dry gas (I suppose) floating around in the gas tank. Every now and then it would obstruct the outlet from the tank! Fished it our with one of those grabbers on a flexible rod and cured that problem.

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WC, CA, D14, WD45

Posted By: Osage_Orange
Date Posted: 10 Feb 2010 at 8:22am

After checking out the fuel system, if the problem persists, install new points and condensor. If that does not solve it, substitute a good coil for the one now on the tractor.

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Why is there never time to do it right the first time, but always time to go back and fix it?

Posted By: Onslowe in Mo
Date Posted: 10 Feb 2010 at 8:48am

Might be a good idea to check the crankcase breather on the valve cover also. I've heard of a D-17 engine running bad because the breather was plugged. Just a thought...

Posted By: Bill Long
Date Posted: 10 Feb 2010 at 12:01pm

Sorry I did not say this first. When the engine slows when heated I have to agree with Osage_Orange - look at the condenser (cheap) then the coil.

Steve at B&B has the right one.

Good Luck!

Bill Long

Posted By: Dave(inMA)
Date Posted: 10 Feb 2010 at 1:47pm

Should have remembered the coil - my CA would behave just as you are describing. Changed out the coil and it's run fine ever since.

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WC, CA, D14, WD45

Posted By: John In.
Date Posted: 14 Feb 2010 at 11:11pm

I'd check your fuel bowl first...shut off fuel then remove bowl, turn fuel back on and see if fuel flows good ,( make sure you have a catch can) sometimes crud gets stuck in the section between tank and shut off valve, it's happened to me a few times ,a real head scratcher . compressed air and a ice pick helped take care of that problem. John