1655 carburator issue

pd143 · Jan 2, 2016

I have a problem that has cropped up. My 1655 gas has been coughing when it starts to pull harder. Doesn't seem to be getting enough gas. Tank, settling bowl and fuel lines, to the carb, are all clean. Have had a new carb kit installed but still having the problem. I have noticed a layer of frost on the section of the carb where it's bolted to the manifold. Seems when the engine warms up, 30 minutes or so, the frost is gone and tractor runs fine. This has been happening all spring and summer, to a varying degee. I'm thinking carburetor icing. I understand how this happens on an aircraft, but what would be the cause in a tractor and what may be the cure? Obstruction, bad float, needle valve, etc.

greg oliver · Jan 2, 2016

My 1650 carb also ices up and on another Oliver forum other 1650 gas owners also ice up. When I was a kid my father was experimenting with making alcohol fuel and when we ran the Farmall M on alcohol carb would ice up. I am burning 87 octane that can have 10% ethanol and otherwise it runs fine.

J. Schwiebert · Jan 2, 2016

Well when the 1600 model were new there were complaints on carburetor icing. If you had problems Oliver had a kit that warmed the air from the exhaust to eliminate the problem. You have an e-mail address or a phone number? You could probably make up a kit. J.

Bob M · Jan 2, 2016

Carb icing is a common problem with the 16xx series gassers (I have one each 1600 and 1650, both of which ice up easily). It's most troublesome worst in cool weather (freezing to about 55 deg) when the humidity is high.

Quickest/cheapest solution: When cold starting first get the choke open as quick as possible. Now let the engine idle at about half throttle (1,200 RPM) for several minutes, then shut it down. Let it sit for about the time it takes to drink a cup of coffee. Heat will soak down from the exhaust manifold and melt ice in the carb. (If there's any wind, park the tractor so the carburetor is on the lee side). Finally restart the engine and PUT IT TO WORK right away (no idling!) It should run fine the rest of the day.

A more complex - but effective - solution is make a sheet metal "stove" surrounding the muffler to collect warm air and feed it to the air cleaner stack.

kevinecwi · Jan 3, 2016

Made this a few years ago, seems to help. I only use it from about gun deer season to the end of the sap flow in spring.

1655 carburator issue

pd143

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greg oliver

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J. Schwiebert

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Bob M

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kevinecwi

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