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Gas engine choke question

A

Anonymous-0

Well-known Member
Dad has an older Gehl skid loader with a Ford gas liquid cooled engine. It has always been very cold blooded. It is hard to get started when it's cold. I figured it needed the choke adjusted so I pulled the air intake hose off the carb and looked in and it is closing all the way when you pull the choke and opens all the way when you push it in. When you pull the choke with it running it makes some difference but not a lot. Most gas engines I have been around will die or nearly die when you choke them. Any ideas what might be going on here? Or what else to look for?
 
I'll check that. I had the carb off 3 or 4 years ago and cleaned it. Where are you at Glen? I have 2 sons that are students at UWP.
 
Are you sure it opening and closing when the engine is running? There is an aerodynamic load on the "butterfly" when it's running and it wants to stay wide open so you have to work against a "lift" force to close it.
Some of these choke butterflies have a "pressure relief door" on them that allows a big reduction in air flow and then it pops open to suddenly admit more air to a cold engine on a choked start. If you have one of these you have to make sure that it's not staying open when you choke it. You should be able to make the engine die with full choke.
 
Jerry beat me to it.. but it is good advice.

plus. I have seen some rebuilt carbs assembled with the choke plate and flapper on wrong.

do check it's function.
 
We helped one on a 8n by putting a new spring on the little air door in teh choke flap. The spring was gone. (We used a retract spring from a ballpoint pen.)
 
Does it idle OK? Sounds like a blocked idle passage; maybe someone turned up the idle speed so it's not noticeable. If you turn the idle screw all the way in and it keeps running, the idle circuit is probably plugged up.
 
My Jubilee like full choke at an idle to start. It also like some or a lot of choke for 5-10 minutes to warm up. I even backed out the large main jet to richen it up in the winter. Runs just fine when it warm. If it requires choke to run when cold, give it some choke.
 
If when running choking it does very little that means the carb is set way to lean when it runs so you have an engine that need the carb adjusted on
 
If it has no little vacuum door in the choke plate, try centering the plate by loosening it and closing the plate tight in the bore, then retightening the screw/s. This will assure a seal. If there is any way air can get into the carb after the choke, (like a broken PCV hose or such, that could do the trick as it will allow much more air to enter. Jim
 
I know nothing about the carburetor set up you have. With an automatic choke, most had a "choke pull off" operated off vacuum. So when the engine started--vacuum helped pull the choke open.
Is it possible that your "mechanical" choke has such a feature?
 
I second a vacuum leak problem. No choke effect and hard starting both point to an air leak somewhere after the choke.
 
"Some of these choke butterflies have a "pressure relief door""

I second that, and, some are set up so the choke lever moves a spring, and the choke butterfly follows IF there's not a lot of airflow/vacuum.

That MAY not be the case here, but it's certainly a possibility to look into.
 
I was still able to get that spring separately from local New Holland dealer. He actually had it in stock. I buy them to put into my John Deere carbs.
 
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