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Tractor Talk Discussion Board |
Re: Why does diesel run with key off?
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Posted by frankiee on May 23, 2006 at 09:32:37 from (70.24.75.25):
In Reply to: Why does diesel run with key off? posted by Quebec Bob on May 23, 2006 at 09:01:52:
On a diesel the key is more of a "electrical master switch"
It does not cause "ignition" of the fuel like a spark plug in a car.
The fuel ignites by heating, by the compression of the piston going up. So all you need is the starter to crank the engine a speed fast enough.
Being it has a mechanical fuel pump as long as the engine is revolving then the pump is pumping fuel.
Why even put the ignition switch there???????????
I don't really know. Someone else will know.
I work with large 16 cylinder 150 liter engines and we don't have ignition switches.
On ship we start with compressed air so we dont need an electic starter or generator.
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