SMD won't start on gas

Marv · Jan 4, 2009

My SMD will not start on gas or run on gas after it is running on diesel. This all started after I decided to degrease it with a hot pressure washer. (never again) Anyway after reading numerous post on this web site, I've come to the conclusion that the butterfly valves in the intake manifold are not closing properly. I've got good spark to the spark plugs and plenty of gas. However, very little vacuum when turning the engine over.
How do I adjust the butterfly valves on this engine? I know there are adjustments to the switchover linkage. Also there are set screws on top of the intake manifold. Any suggestions? Marv

Janicholson · Jan 4, 2009

There is a stop in the linkage. at the shaft for the butterflys. See if the tab is touching it (gas mode) if not it probably has a piece of deposit in the valve. Snap the valves open and shut several times to see if it changes. Adjustment must be done by the book, which I sold with My MD 8 years ago. JimN

SMD won't start on gas

Marv

Member

Janicholson

Well-known Member

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