JOHN DEERE MODL A SERIAL 627047

TIM BOLLINGER · Aug 18, 2009

I AM RESTOREING A JOHN DEERE MODEL A SERIAL 627047. THE NUMBER TWO CYLINDER DOES NOT SEEM TO BE FIREING LIKE NUMBER ONE. I NOTICE THAT THE BLOW BACK FROM THE CYLINDER RELIEF VALVE ON #2 IS NOT REGULAR OR AT ALL EXPLOSIVE COMPAIRED TO #1. THE ENGINE RUNS WITH RAMPING RPMS. AM I HAVING FUEL OR IGNITION OR TIMEING ISSUES.

Christopher S. · Aug 18, 2009

If this is all occuring at low idle then, it is quite common for #2 cylinder not to fire as hard at idle. On the letter series the incoming fuel air mixture is usually all used up by #1 cylinder at idle, it leaves very little for #2 to use. This was taken care of on the number series with the advent of the Duplex carb. The ramping RPM may be from the idle needle not being open far enough or a blocked passage in the carb. As the engine starts to die the governer opens the butterfly valve to send more fuel/air to the engine, when the rpms pick up the butterfly closes and the rpms slow down starting the cycle all over again. I'm no expert but this maybe a place to start looking.

Vito · Aug 18, 2009

Why are you shouting at us?

Vito

JOHN DEERE MODL A SERIAL 627047

TIM BOLLINGER

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Christopher S.

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Vito

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