580 Diesel Manifold Heater

Hello, Three days into owning a Case 580 with a diesel engine, I am wondering two things. One, can anyone narrow down from the picture what year this is? The S/N tag is missing from the cowling on the right hand side. The tractor has the three position hydraulic shuttle shift with 4 speeds. The second question has to do with the intake manifold heater. In the Case factory service manual, the heater solenoid is activated by a white wire (#30) that comes from the ignition switch. I am not sure if the ignition switch in my tractor is the correct one, as the heater solenoid is only activated while the engine is being cranked. It seems to make more sense that the heater solenoid could be activated for a short period prior to the engine starter being engaged. Is this the way it should be?

Thank you,
Greg

In my opinion, it is an un-needed feature, at least here in SE Michigan. It only heats the small amount of air initially inside the manifold which is sucked into the cylinders within one-round of the engine. Then the heat is gone and the engine didn't start yet anyway. I perfer to crank the engine for a few seconds anyway to build oil pressure before it fires. Our 580CK starts well without the heater, if the battery is OK. We've disabled the heater so it cannot be used to drain the battery during cold weater. We've done this on our other Case tractors also.

Manifold heaters just don't work as well as injector heaters which warm the fuel.

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Thanks,
Greg