CA 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=12467
Printed Date: 31 Jan 2025 at 11:57am
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Topic: CA carb leak
Posted By: Lincoln
Subject: CA carb leak
Date Posted: 14 May 2010 at 9:22pm
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I put a new zenith carb on our 51 CA. It was working fine until tonight, the governor was hunting continually, and when I got off the tractor to look at the carb, it was leaking profusely. any help would be great.
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Replies:
Posted By: CTuckerNWIL
Date Posted: 14 May 2010 at 9:28pm
Do you have the anti surge spring on the throttle rod? Where is it leaking from? Could be the float stuck or crud in the seat.
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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
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Posted By: Lincoln
Date Posted: 14 May 2010 at 9:40pm
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leak is coming from the bottom of the carb as well as from the rubber boot that comes from the air cleaner. I assume the anti surge spring is still there as it was working fine before. Thanks
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Posted By: CTuckerNWIL
Date Posted: 14 May 2010 at 10:04pm
I would say either the float drop was not right and the float got stuck on something so it can not close or you have a foreign object stuck in between the needle and seat.
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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
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Posted By: Dave(inMA)
Date Posted: 14 May 2010 at 11:16pm
Same sort of trouble I had with carb on the WD45. Clean the float valve and fine tune the float level. I adjusted mine to put a little more pressure on the float valve when the bowl is full.
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WC, CA, D14, WD45
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Posted By: Ted in NE-OH
Date Posted: 15 May 2010 at 12:46pm
I had same problem ,traced it to a pressurized gas cap. Pressure was overcomming float. Was especially bad when hot.
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CA, WD, C, 3 Bs, 2 Gs, WC, I-400, 914
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Posted By: Brian Jasper co. Ia
Date Posted: 15 May 2010 at 4:01pm
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Sounds like junk in the float valve to me. If you're carefull, you maight be able to open it up without tearing the gasket. One thing I found on my CA with a Zenith carb was it had set for a long time and had fuel go bad and dry up in the tank, filter, and line. When I first got it running after rebuilding the carb, I was constantly fiddling with it. It never seemed to stay adjusted correctly. I had put a new sediment bowl on it, but reused the steel line. What I found was the hard crusty deposits you often find in the bottom of an old carburetor were also in the line. The vibration would break them free and create a restriction in various places in the carb. I fabricated a new line, cleaned the carb out, and haven't had any problems for the last 10 years.
If it were mine, I'd put a new sediment bowl on if you haven't already. Fab up a new line and clean the carb.
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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
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Posted By: Embellem
Date Posted: 17 May 2010 at 1:18pm
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My CA did that on me once, leaking from the very same places you mention. Turns out there was a tiny brass burr that had gotten into the float bowl and was blocking the needle from completely closing. Probably came from a new brass fitting I had just put on the carb.
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