Yes they are direct inject, one is a john deer/Lull fork lift, the other is an Iveco/Duitz which has one glow plug in the intake manifold that shoots raw fuel through it. The fuel ignites and is drawn into the cylinders burning it is controlled by a toggle switch on the dash. It really works great.
I do what ever I can not to use any glow plugs at all. The compression in these engine must not be very high because my other diesels don't even have glow plugs.
The little voltage drop that it takes to hold the solinod on is negligible . If you plug in the block heater, you never have to use the glow plugs plus you have instant heat in the cab.
I have a 92 IDI and I installed an isolator solinod
the GP controller with a lighted switch on the dash. That way I only use the glow plugs when the engine is cold.
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