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Re: Bob M Haas, M with gas/kerosene/diesel
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Posted by John C on July 20, 2001 at 17:37:13 from (64.89.13.130):
In Reply to: Bob M Haas, M with gas/kerosene/diesel posted by 230,H,M on July 20, 2001 at 17:17:47:
The reasnon that he engine will turn over on gas mode and not diesel is that the engine compression is dropped to run in gas mode. This is accomplished by pulling back the lever on the left side of the tractor and closing the throttle. When you doe this, a set of valves in the head open into a chamber in the head that increases the volume of the head to allow for about 6:1 compression. It also opens a butterly valve in the intake to allow the gasoline fuel air mixture to be drawn into the combustion chamber. When starting on gas, the diesel system is not pumping any fuel into the cylinder. When the engine warms up, it takes about 1 min for a cold engine, you throw the lever on the left forward and open the throtle to start feeding fuel through the injection pump. This also closes the butterfly to the carburator and closes the valve to the low compression chamber taking the compression to about 16:1. I know that mite be terribly confusing. Maybe someone else can explain it better than I did. But the different compression rations between gas and diesel mode is why it will not turn over in diesel mode. John C
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