diesel 'ign. timer switch'- explain please!

[Dez]

ive been sorting out wiring up the 2.8 iveco turbo diesel in the pickup tonight.

with the help of the factory manual (cheers ben!) ive tracked and traced all the wiring, eliminated what i don't need and labelled what i do, ready to wire up.

this engine is different to what I'm used to in my limited playing with diesels, in that is doesnt have glow plugs but a 'thermostarter'.
ive kinda figured out this is like one big glow plug in the inlet that glows with the starter motor turning over and has diesel squirted at it that is then sucked into the engine and ignited.

but what is also has is a 'ignition timer switch'. the wiring code is labelled as-
'supply(+15)of variable resistor to ign. timer switch'.

the wire comes in with the main engine loom, and goes to a water temp sensor on the thermostat housing. a second wire then runs from the other side of this sensor to this thing that is mechanically attached to the side of the diesel pump by means of a short cable-




ive never encountered anything like this before, but i am basically right to assume its kind of an automatic 'choke', or temperature controlled diesel pump-timing adjuster? so as the engine warms up, it slowly changes the pump timing for better/more economical running?

if so, what do i do with the feed in wire? just connect it to a ignition switch controlled live feed?

[Deleted]

think that thing with teh short cable is a solenoid that advances the timing when shes cold to let her start easier.. then when its warm it drops back out putting the timing back t normal.the water temp sender is to let it know how much power to recieve (hence variable on the loom label) if your unsure I would personally get a choke knob off one of the merc trucks and connect it with that.. give yourself manual control over it...

[Dez]

nah, i know not to wire the thermostarter to a permanent.
it goes to the same terminal as the starter motor impulse wire- so its only on when the starter is cranking- as soon as you let go of the switch once its fired it turns off.
it does have a separate diesel feed off the pump as you say, with a separate cutoff solenoid for it too, although it seems it does get fuel to it permanently whilst the engine is running, and doesnt cut off til its turned off as the wires for both shutoffs go to the same terminal.

[Rev. Dick Deluxe]

Anything labled as circuit 15 or terminal 15 is an ignition live. 30 is permanent live and 31 is earth.
Basicly the temp sensor will increase in resistance as the engine warms up and the current going to the actuator will decrease letting the plunger out and retarding the pump timing.

[Dez]

Dec 30, 2011 10:28:36 GMT Rev. Dick Deluxe said:

Anything labled as circuit 15 or terminal 15 is an ignition live. 30 is permanent live and 31 is earth.
Basicly the temp sensor will increase in resistance as the engine warms up and the current going to the actuator will decrease letting the plunger out and retarding the pump timing.

thanks very much rev, youve confirmed exactly what i thought