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Re: Why gas to start the diesel engine?
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Posted by Wayne Swenson on December 21, 2004 at 16:58:20 from (66.191.70.4):
In Reply to: Re: Why gas to start the diesel engine? posted by farmallkid From ONT. on December 21, 2004 at 16:34:19:
IH didn"t use a "pup" for starting.
The cylinder head on the main engine has a secondary or "extra" combustion chamber that was accessed up for starting on gasoline at a lower compression ratio.
When the decompression lever was pulled the small third valve in the cylinder head opened, the gasoline carburetor was began to function, and the distributor began to make sparks. The engine ran at a set speed on gasoline until the cooling system was warm enough to allow operation on diesel fuel.
Closing the decompression lever and opening the throttle allowed the small third valve to close thereby shutting off the secondary combustion chamber resulting in increased compression, the carburetor was shut off, and the distributor quit making sparks. The engine would now run on diesel.
The somewhat complicated cylinder head was prone to cracking unless the engine was cooled down carefully before shutting down.
What you had was a gasoline engine "hiding" inside a diesel engine.
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