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Allis Chalmers Discussion Forum

WD carb jet

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02-21-2008 10:59:52

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My WD I bought last fall runs good with just a bit of choke. Last fall I cleaned the jet and polished it good but no help. Float level seemed OK. If I read my notes right, it is a # 27 or .0531. Believe it was a Zenith carb. Wondering if this was the proper size. Could the tractor have been changed to the commonly used over size bore causing this? Would a #54 drill, .0550 or a #28 jet be about right?

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Steve in N.J.

03-01-2008 19:51:51

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 Re: WD carb jet in reply to coloken, 02-21-2008 10:59:52  
If you need the choke on while the engine is running, you have an enrichment problem. More than likely, the enrichment passage at the bottom of the carb is partially plugged with rust and debris from over the years. A rebuild and a good glassbeading is in line here to get the muck and debris out. Drilling the jet is just going to take the carb out of its air/fuel ratio and give you an over rich condition. BTW- on Zenith carburetors float level is important! Zeniths are pretty fussy carbs and with a higher float level than normal, usually have over fueling and flooding problems. We offer complete carb rebuilding services, and whenever I rebuild a Zenith for one of our customers, I always set the floats a tic on the low side because of these conditions it causes when they're high. Marvel/Schebler carbs are easier to work with and are more forgiving to adjustments. If you're still having problems, drop us a line or give us a call. I'd be glad to help you out and give you some tips on your carb... HTH

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Kentb of SWMO

02-22-2008 10:59:38

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 Re: WD carb jet in reply to coloken, 02-21-2008 10:59:52  
If you do not find a manifold leak you can richen the fuel mix two ways. One is raise the float level. I do not care what the specs say. The other is to enlarger the main jet with a drill. If you fuel has 10% ethanol in it this may be you problem as this fuel will need a BIGGER hole. If your carb has a removeable venturi be sure it is there. Years ago I work at an Allis dealer, a guy rebuilt a carb which was not his normal job, and he left out the venturi. The tractor would run just not very well.


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Jerry Coulter

02-21-2008 18:05:39

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 Re: WD carb jet in reply to coloken, 02-21-2008 10:59:52  
Opening the adjustable jet should clear that up. Are you certain the gaskets to the manifold and in the carb are good? Spray some starting fluid all around the manifold while the engine is running.

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02-21-2008 19:01:47

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 Re: WD carb jet in reply to Jerry Coulter, 02-21-2008 18:05:39  
Adjustable is wide open. Will check again for manifold leak.

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