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Lincoln 
Bronze Level
Joined: 22 Sep 2009
Points: 26
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 Topic: CA carb leak
Posted: 14 May 2010 at 9:22pm |
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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CTuckerNWIL
Orange Level
Joined: 11 Sep 2009
Location: NW Illinois
Points: 22824
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Posted: 14 May 2010 at 9:28pm |
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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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Lincoln
Bronze Level
Joined: 22 Sep 2009
Points: 26
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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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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
Points: 22824
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Posted: 14 May 2010 at 10:04pm |
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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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Dave(inMA)
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Joined: 12 Sep 2009
Location: Grafton, MA
Points: 2399
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Posted: 14 May 2010 at 11:16pm |
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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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Ted in NE-OH
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Joined: 12 Nov 2009
Location: Austinburg OH
Points: 1703
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Posted: 15 May 2010 at 12:46pm |
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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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Brian Jasper co. Ia
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Joined: 11 Sep 2009
Location: Prairie City Ia
Points: 10508
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Posted: 15 May 2010 at 4:01pm |
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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Embellem
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Joined: 15 Oct 2009
Points: 103
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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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