Farm Equipment - Zenith Carburetor

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Zenith Carburetor

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=182782
Printed Date: 10 May 2024 at 12:30pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Zenith Carburetor

Posted By: bigbirdww
Subject: Zenith Carburetor
Date Posted: 24 Aug 2021 at 4:05pm

Rebuilt carb but fuel continues to leak past rubber tipped needle/ seat into the choke intake. Read on some of the post that a non rubber tipped needles work better. Where can I purchase?

Replies:

Posted By: allisbred
Date Posted: 24 Aug 2021 at 4:12pm

If the needle valve is clean, check float for leakage and float setting. To check needle valve, hook fuel to the top of carb only and lift the float.

Posted By: DaveSB
Date Posted: 24 Aug 2021 at 4:37pm

Also, fuel must be clean, any small rust particles in fuel may cause needle to leak.
I’ve seen this on carbs I rebuilt for people and they say they still leak, so I have them bring tractor over, and needle has rust particles on it. Gas tank needed cleaning and possibly an in-line filter.
May not be your problem, but something to check.

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1948 C, 1953 CA, 1948 WD, 1961 D-17 Series 2 Diesel, 1939 WC, 1957 D14

Posted By: bigbirdww
Date Posted: 24 Aug 2021 at 8:09pm

Looks like I'll be taking it apart again. Brand new float. I'll try your suggestion. Thanks

Posted By: bigbirdww
Date Posted: 24 Aug 2021 at 8:13pm

I did empty out the fuel tank and put in some engineered fuel and flushed. I'll try the in- line filter too. Thanks

Posted By: MACK
Date Posted: 24 Aug 2021 at 9:19pm

Is seat screwed in tight? Some times a new float will drag the sides of bowl. MACK

Posted By: Steve in NJ
Date Posted: 25 Aug 2021 at 8:22pm

The new Viton needles do a great job in seating. The problem with them is if you have debris in the tank or in the inlet of the Carb (where the elbow screws in) that debris will almost always stick to the Viton needle. Remove the 90 degree elbow from the Carburetor and run a bore brush on a hand drill in and out of that cavity to get all the rust and debris out. Make it shine in there. That is a BIG problem child right there!

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: bigbirdww
Date Posted: 27 Aug 2021 at 11:47am

Awesome. Glad I asked on the forum. A good saturday project is ahead of me. Thanks