Farm Equipment - D15 Carb

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D15 Carb

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=207183
Printed Date: 22 Jun 2025 at 6:23am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: D15 Carb

Posted By: modirt
Subject: D15 Carb
Date Posted: 21 Jun 2025 at 4:51pm

Was raking hay the other day and engine started surging, then wanted to die. Suspected it might be the carb, so hopped off and turned rich/lean adjustment screw out and after about half a turn, she smoothed out and ran fine after that.

Trouble is that screw is almost loose enough to be floppy and problem may have developed by screwing itself in. Tried to tighten the smaller of the two nuts and it is more or less as far down as it is going. Does that have some form of packing in there that can be or needs to be replaced? Or......how does one firm that screw up so setting doesn't wander?

I assume for best fuel economy for light duty use like raking hay, one wants it running as lean as it can? Right now it is about 3 turns out.

Replies:

Posted By: steve(ill)
Date Posted: 21 Jun 2025 at 6:11pm

3 turns out is normally i little excessive.. It might mean you have a little piece of crap plugging a jet inside.. I have wrapped teflon tape on the threads to tighten things up somewhat.. a coil spring under the screw head can also help... if it has a head on it..

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

Posted By: Kenny L.
Date Posted: 21 Jun 2025 at 6:26pm

Modirt, Text me your address and I will send you something that will fix you right up it's off of the packing that was use on the water discharge pump on the wash plant that I run at one time. I did have your address but miss place like a lot of stuff around here. I text you. Kenny Loughren.