CA 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=9672
Printed Date: 21 Jan 2025 at 6:23am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: CA Carb
Posted By: Lincoln
Subject: CA Carb
Date Posted: 18 Mar 2010 at 7:34am
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Looking for someone who can rebuild a carb from a 1953 CA. It is leaking profusely after the standard rebuild kit was installed. Thanks
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Replies:
Posted By: Brian Jasper co. Ia
Date Posted: 18 Mar 2010 at 7:41am
Did you check the float for having gas inside it? Proper level? Leaking like you say says either float problem, or dirt (most likely) in the float valve itself. When I rebuilt my CA carb, (Zenith) I kept having to take it apart and blow out the small passages and main jet. I had put a new sediment bowl on it, but reused the metal fuel line. What I figured out is that fuel had been allowed to go bad and dry up in the line forming that hard crusty stuff that no carb cleaner will touch. The vibration from the engine running would cause the stuff to flake off and make it overflow, or affect it running. I fabbed up a new line and I haven't had to fool with the carb for nearly 10 years now.
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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: Dave(inMA)
Date Posted: 18 Mar 2010 at 7:45am
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Lincoln, there are a couple of fellows on here who rebuild carbs....I believe that Steve Barbato at B&B Custom Circuits is one of them. BUT....you might want to check a few things before going that route.
Sounds like you may have a bit of dirt or grit in the seat for the float valve or on the valve itself. Or your float may have a hole in it so it won't float. Or the float is not adjusted right so that it closes the float valve when the carb bowl is full of gas. Dirt/grit is a matter of cleaning or perhaps replacing the float valve. Test the float shaking it - if you hear liquid sloshing around inside the chambers, it has a hole. Replace it. Test proper adjustment by holding the top part of the carb, with float installed, at eye level. Float should be parallel to the flat surface above it. If not, you can gently bend the float arms so that it's correct. PM me if this doesn't make sense!
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WC, CA, D14, WD45
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Posted By: Pipe
Date Posted: 18 Mar 2010 at 8:18am
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Same thing happened to my Ca took the rubber tiped needle that came with the kit and replaced with the old steel tip one . all is well agian . I did read that if you tap the rubber ones in the seat a couple of times they seat themselves. but I dont know about that .
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Posted By: Burgie
Date Posted: 18 Mar 2010 at 8:44am
Another thing I found was if the float is (sunk in) it will cause the carb to over flow.
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"Burgie"
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Posted By: Dave(inMA)
Date Posted: 18 Mar 2010 at 4:55pm
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Lincoln, you might also have a loose float valve seat. If so, your carb effectively has no float valve. If you want to know why I think that's a possibility, read the tale below!
Spent some time today addressing gas running out of the carb on my C! Appeared to be leaking between the carb halves...found some bits of gasket stuck to the bottom section and removed same. Carefully filed down some rough spots. Installed new gasket. Put it back together and ........gas soon began running out of the air intake. Pulled everything apart and decided to remove the float valve seat......it was loose! The local ace mechanic (ahem!) had removed the seat when cleaning the carb and (clearly) failed to tighten it when reassembling last week. Gas was making its way through the threads - the valve was effectively missing. So, tightened the seat and problem cured.
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WC, CA, D14, WD45
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Posted By: Austin(WI)
Date Posted: 18 Mar 2010 at 7:40pm
I am having the problem where I rebuilt the carb and made sure everything was clean and free of any blockage and I cannot run my CA without the choke pulled out halfway.
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"Better By Design"
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Posted By: Dave(inMA)
Date Posted: 18 Mar 2010 at 7:53pm
Austin, did you adjust the mixture? Does this happen at all engine speeds or just as idle?
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WC, CA, D14, WD45
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Posted By: norm [ind]
Date Posted: 18 Mar 2010 at 8:03pm
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we rebuild carbs 1-800-254-3116
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Posted By: Austin(WI)
Date Posted: 18 Mar 2010 at 8:55pm
no...just when I have it floored
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"Better By Design"
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Posted By: Austin(WI)
Date Posted: 18 Mar 2010 at 8:56pm
From idle to halfway on the quadrant it is fine, but from halfway to floored...it will not run without the choke.
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"Better By Design"
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Posted By: Ken in Texas
Date Posted: 18 Mar 2010 at 10:15pm
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The float valve seat has a gasket under it. The seat must be tight against the gasket or like sombody above said its like not having a needle in the seat. I have seen some differences in needles and seats in some new kits. Most AC manuals recommend using thicker or thinner gaskets under needle valve seat to set float level. They say. Do not bend float to change fuel level.
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Posted By: Dave(inMA)
Date Posted: 19 Mar 2010 at 7:21am
Austin, I am no expert on these questions, but it might be that the high speed jet is dirty. Probably no adjustment for that - at least none on my C/CA carbs. When you move the throttle from idle to higher revs, the carb shifts the air/gas mixture from the idle jet to the high speed jet, so it sounds as though that high speed jet is partially clogged since closing the choke richens the mixture. I'd try cleaning that jet and see if that helps. Let us know how you make out, please.
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WC, CA, D14, WD45
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Posted By: Brian Jasper co. Ia
Date Posted: 19 Mar 2010 at 3:18pm
Austin, sounds like the main jet is restricted, or your float level is too low. Make sure you have no vacuum leaks. A shot of carb spray at each gasket in the intake system with the engine running is a quick and easy way to find any leaks. If you don't find any leaks, take the carb back apart and blow through it with compressed air. You can verify everything is open by spraying carb cleaner through each passage. If the float level is off, bend the arm on the float with needlenose pliers. Don't press against the valve and seat to correct.
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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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