In article , Engineman1 wrote:

A friend just bought a yacth with twin Hino diesels. They are started by a key
switch but when they you want to shut them off you have to press a stop button
until the engines quit, then turn the keys off. I don't have much experience
with diesels but years ago when I had a job repairing forklifts I ran into a
similar situation.
This seems to me to be unecesaralary complicated. After all, most diesel
powered cars turn on and off with a key switch. I have asked many people this
question but have gotten answers that didn,t seem plausible. So now I'm asking
the experts.
Thoughts?

Modern diesel automobiles that I have encountered (and, indeed, modern
tractors and whatnot) have fuel solenoids that shut off the flow of diesel
to stop the vehicle when you shut the key off.
A mechanical diesel (as opposed to an electronic-injection diesel) will
run as long as it has fuel, unless something makes it stop. Every diesel
will have a kill-switch under the hood in case you lose electrical power -
without power you can't move the solenoid to shut off the fuel. If the
solenoid is sprung then you might have a situation where without power the
spring returns the solenoid and the fuel shuts off. That, to me, is not a
good thing. I've made it home in my old diesel truck with a frozen battery
and without enough power to run the turning indicators or anything else, but
the engine ran fine to get me home. If it had have stopped dead somewhere I
would have not been amused.
A diesel of an older design may not have a solenoid but rather a
spring-return lever that acts both as the emergency kill switch and the
usual method of stopping the engine via a cable-pull from the operator's
position.
In the case of these Hinos, if they're similar to the Hinos that I have
dealt with, they will be mechanically injected and definitely of the 'run
until they're out of fuel' variety, so they have to be stopped manually. I
haven't yet seen a Hino with a compression release, so I would strongly
suspect that the button you're pushing is attached to a solenoid that pushes
against a spring-return lever on the injector pump to kill the engine.

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Mike Graham | Metalworker, rustic, part-time zealot.
mike 'at' @metalmangler.com |
http://www.metalmangler.com| Caledon, Ontario, Canada