Re: Why does diesel run with key off?

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.

Replies:

• Re: Why does diesel run with key off? Mike (WA) 12:17:26 05/23/06 (0)
• Re: Why does diesel run with key off? Bob M 10:39:39 05/23/06 (0)

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