3400D Glowplug?

Cam50

Member
I have a '72 diesel. At the front inside of the intake there is a fitting with an elec. connection and a tube that seems to be a fuel return. Would this be some sort of a glowplug?
Not real familiar with with Henry's machines. Any help greatly appreciated
 
It's a Thermostart unit for cold starting, some Perkins, David Brown and Continental engines had them also. The key switch should have a heat, and a heat/start position. Use heat for about 15 seconds then turn to heat/start for cold starting. Do not use for more then one minute or the heating coils will be damaged per the Delphi service letter.
 
My key switch has only 3 positions, off, on, and start. Wrong switch?
I take it these are not meant to be used with ether?
 
Right - do NOT use ether in conjunction with the Thermostart.
Your switch will likely work... try turning it past the run position, but not quite far enough to make it crank. That should let the element heat. Give it about 30 seconds. If things are quiet, you can sometimes hear the whooof of the fuel igniting. Crank the engine over then.
 
(quoted from post at 19:34:58 01/30/15) My key switch has only 3 positions, off, on, and start. Wrong switch?
I take it these are not meant to be used with ether?

I have a 74 3000 diesel with the thermostart in the intake. I have a 4 position key switch. Off straight up. turn and hold counter clock for heat. Then turn one click clockwise to run. Then start. I have heard of some coming with a key that has 2 different starting positions. Someone els might have more info on thEm. My thermostart does not heat while cranking. My switch works like a tractor with glow plugs. However it helps a lot for cold starting.
 
Thanx All. Makes more sense now. Have it split for a clutch now. Have somewhere to start now.
 
Follow the wire from the thermostart back to the key switch. If it is connected to its own separate terminal then it is likely as Fordfarmer described, with the heat position halfway between the run and the start positions without its own detent.

If the wire is not connected and the switch does not have a separate unused terminal, then I would test it by jumping the thermostart wire to a 12 volt hot point temporarily to make sure it still actually works, as it's possible that the thermostart stopped working at some point and then the key switch got replaced later with one that didn't have a heat position at all.
 

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