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D17 series IV carb leak

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=178768
Printed Date: 21 Aug 2025 at 1:46pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com


Topic: D17 series IV carb leak
Posted By: Too Tall
Subject: D17 series IV carb leak
Date Posted: 03 Mar 2021 at 1:42pm
The Marvel schebler carb leaks out the bottom of the bowl from that brass looking plug that looks like a cable.  How do you stop that?  i do not even know what that plug is for.  Could it be ok and my float is stuck?  Thanks



Replies:
Posted By: Steve in NJ
Date Posted: 03 Mar 2021 at 4:56pm
That drain is there just for that reason. It allows fuel to run out if the fuel overflows from the fuel bowls. You could possibly have one of the float pontoons taking on fuel allowing the floats to sink. Better known as a "sinking float".  You also could have a little debris that got caught in the seat of the inlet needle allowing fuel to enter the fuel bowl area raising the float level and causing the overflow. No matter what you do, you'll need two remove the 4 screws the hold the top and bottom together and investigate the problem. I offer Carburetor service parts and rebuilding services if interested.   HTH
Steve@B&B


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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife


Posted By: Too Tall
Date Posted: 03 Mar 2021 at 10:03pm
Thanks Steve, I will check that out.


Posted By: Stan R
Date Posted: 04 Mar 2021 at 5:24am
Sounds like your Main carb adjustment is leaking- it is located on the bottom of the bowl. Try tightening the jam nut on it, or back it off and add a bit of teflon tape in the gasket area (threaded portion) and re-tighten, otherwise replace it.


Posted By: Too Tall
Date Posted: 04 Mar 2021 at 11:34am
Thanks Stan R.  I did think of that but i think i isolated the leak to the drain that Steve and I are refering to. I put my finger over that drain and the leak stops.  It has to be something that is causing the gas to overflow into that part of the carb.
It has a TSX871 carb on it.  A kit cost $65 on ebay.  I have never had much luck working on carbs myself.  Also on ebay I seen a rebuilt one for $350 minus $80 for core.  I am not sure what way to go.  We do not have Allis dealers around here anymore.
Steve could you give me a app. cost and turn around time if I shipped it to you?


Posted By: Dennis J OPKs
Date Posted: 04 Mar 2021 at 11:59am
If you've got a little time & don't mind the shipping, send it to Steve & he'll rebuild it for you.  He did mine a while back --I hope he still offers this service?



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