Thread: Questions Questions Questions

It sort of depends a bit nowdays, as modern diesel injectors are electronically fired, but basically as you said, there is a soelnoid / relay that stops the fuel supply when the ignition is switched off.

Rgds
Pete

It can be mechanical or electronic. Mercedes has a mechanical lever that is vacuum actuated when the ignition is turned off. Our Kubota has a lever that you pull to shut it down. It's also got a knob that forces the exhaust valves open to release compression, handy if the engine ever ran away. You can buy shutdown valves to put in the air intake in case of runaway too.

Diesel Engine Safety Products | Chalwyn

Actually this got me thinking, I really ought to install one of those emergency air shutoffs as I have an auto now and have NFI how I'd shut it down if it did run away.

Petrol motor stops because you have turned off the electricity to the sparkplugs

Diesel motor stops because you have turned off the fuel supply

Mike

And if its a Land Rover,it probably wont start,so you wont have to worry about stopping it

or if it does start,it may stop all by itself just because it wants to

hahahahaha Scarry. v funny!

petrol engines stop straight away because you turn off the spark but you are also turning off the fuel on the injected engines and in some of the carbie engines.


in most diesels all your doing is stopping the fuel from coming out of the injectors tho some also flap the air intake and exhaust closed as well (but not in landies)

in the series the shut down is just turning off the spark and in the diesels its just winding the fuel collar to a position that relates to no fuel by means of a pull stop cable

in the carby v8s its turning off the spark and in the EFI its the spark and the fuel, in the tdi diesels your turning off a solenoid that needs to be engergised to allow the injector pump to push fuel to the injectors

in the TD5 your turning off the fuel injectors by killing the power to the ECU that controls them and at the same time you are turning off the fuel pump that feeds the injectors fuel.

havent gotten round to nutting it out on the rebadged transit diesel yet.

You missed one - in the Isuzu diesel it works like the Series with a stop cable, but this is operated by a small electric motor and gearbox that resides in a plastic bag to the right side of the brake pedal mount in the engine compartment.

John