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Bob M Haas, M with gas/kerosene/diesel

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230,H,M

07-20-2001 17:17:47




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Thanks for the info. I am a little slow here. Need clarification. Is there some way to relieve / bypass the Diesel mode when using the Gas mode to start the engine? I am a little thick I guess, but it seems to me that unless there is some way to disable diesel mode during start the engine should crank with the starter in any event. Maybe what I need is an explanation of how the system works.
Thanks and bear with me.

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230,H,M BINGO the light is on

07-21-2001 17:49:36




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 Re: Bob M Haas, M with gas/kerosene/diesel in reply to 230,H,M, 07-20-2001 17:17:47  
Beautiful explanation! You lit the light of understanding. Thank you all so much.



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Haas

07-21-2001 04:37:33




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 Re: Bob M Haas, M with gas/kerosene/diesel in reply to 230,H,M, 07-20-2001 17:17:47  
On my MD and every other one I have seen, when the starting (switchover) lever is forward, it is in gas mode. Pulled back to the rear is diesel mode. The others have given you an adequate explanation of all that happens when you move that lever. All the linkages that are worked by that lever have to be in proper adjustment or the starting system may not work.



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Bob M

07-20-2001 17:52:01




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 Re: Bob M Haas, M with gas/kerosene/diesel in reply to 230,H,M, 07-20-2001 17:17:47  
You are correct - that's what the decompression (starting) lever does. When you pull the lever back it opens an 3rd valve in each cylinder. This opens a passage to an auxiliary (starting) chamber in each cylinder. This reduces the compression ratio from about 14:1 to about 5(?):1, making the motor much easier to crank. Each starting chamber also contains a spark plug. The starting lever also does several other things: It switches a pair of butterfly valves in the manifold so incoming air passes thru the carburetor, releases the carb float so the carb can fill with gas, and closes the circuit to the ignition coil primary. Thus pulling the starting converts a high compression, fuel injected diesel engine into a low compression, spark ignition gasoline engine. Once the motor is started and warmed a minute or two on the gasoline cycle, pushing the lever back in reverses all of the above, and enables the diesel cycle. The motor then runs like any other diesel.

It's a rather complex solution to the problem of starting a diesel engine with a low-powered electric starter. Some other mfr's - Deere and Caterpillar - solved the problem by utilizing a separate 2 or 4 cylinder gas starting (pony) motor to crank up their early diesels.

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John C

07-20-2001 17:37:13




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 Re: Bob M Haas, M with gas/kerosene/diesel in reply to 230,H,M, 07-20-2001 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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