1800 A carburator settings

145 Workhorse · Dec 16, 2016

Recently had my Marvel Schebler carburater rebuilt. I can not get the engine to run smooth at high idle speed unless the choke is wide open. Without choke, the engine continues to surge. The high idle screw is wide open. Or if taken out completely, the engine runs better, little to no surging.

I believe the engine is not getting enough gas. Steady flow from the tank filter. What is the proper float height? Is a jet in the carb worn? I am baffled.

Electrical system seems to be good. Engine does not miss and starts good.

J. Schwiebert · Dec 16, 2016

Are you talking a cast iron Marvel Original one? A lot of 1800 A series had the later manifold and an aluminum Marvel installed.

145 Workhorse · Dec 17, 2016

(quoted from post at 04:21:18 12/17/16) Are you talking a cast iron Marvel Original one? A lot of 1800 A series had the later manifold and an aluminum Marvel inst
alled.

It is a cast iron Marvel Schebler.

145 Workhorse · Dec 17, 2016

I believe this is the original, cast iron carburetor. I am trying to use my operator's manual to get the settings correct and go from there. This tractor has very low hours for it's age, about 3200.
What is the float height supposed to be?

greg krush · Dec 17, 2016

Are you going thru the fuel pump or gravity feed??? if gravity feed I have seen air lock in the line that will let some fuel thru but not
enough to keep it going, that it will run at full choke means that it is not getting enough fuel without a vacuum pulling more fuel to
the carb. also needle valve seat may be too small or slightly plugged, 1800 is a gas hog and needs lots of fuel, you may need to
bore the needle seat to get more fuel thru it. In my experience the float level is not that critical, main jet is at the bottom of the
bowl so as long as it is covered it should run.

J. Schwiebert · Dec 18, 2016

Well I have read this several rimes. Do you have a vacuum gauge? How about a few (less than 10) dollars to make yourself a homemade manometer? Have you had the sediment bowl out of the tank? How does it idle? Does it do this warm or cold? Do you have a phone number? I disagree a little bit with Greg. The 1800 A series was the most fuel efficient gas tractor ever tested in Nebraska. Oliver spent a lot of money promoting that fact as well as M-S because of the carburetor. Your turn. J.

145 Workhorse · Dec 19, 2016

J. Schwiebert call me on my cell phone but not until Tuesday, December 20, 2016. Other commitments. 715-650-0091. Call on Tuesday if that works for you. I have a filter installed instead of a sediment bowl. I'm not a good engine man, still learning in my old age. Thank you for your interest.

gary66 · Dec 26, 2016

I have an 1850 with a MS 37 or 36, can't remember. They are simple with few parts, but must be as right as they could get. The float is
very odd, almost the exact size of the bowl, setting it would be extremely difficult cause there's seems to be no where to set it, it's
packed in there.

Definitely sounds starved for fuel. How was it before the rebuild? Make sure you didn't do something to the supply in the process. Stuff
gets in the neck out of the tank not easily found.Sounds like the rebuild wasn't right. I did mine, wasn't happy and had it rebuilt by a
guy who used to sell them and still works on them, imagine that.

Daughter gave me a book called Oliver Tractors by T Herbert Morrell, A Chief Engineer's Account 1940-1970. A good read explaining the
reasons behind many of their models. Just getting to the 1800-1900's. I'll be looking for any comments on the 1800's fuel efficiency.

1800 A carburator settings

145 Workhorse

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J. Schwiebert

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145 Workhorse

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145 Workhorse

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greg krush

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J. Schwiebert

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145 Workhorse

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gary66

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