[Mech]

When I first got the tractor I did talk to my salesman (he said use the intake heater), tried to call their service dept twice, left an message and they never called me back. I talked about it on this forum. When I found out the block heater made it start easily I had other priorities and didn't pursue it further. My Bad.

Your right I believe my engine is a 3TNV82A. This is from my Technical Manual: Manifold Heater Circuit Operation
Function: To provide pre-heated air in the air intake manifold for
improved combustion during cold weather starts.
Operating Conditions: Key switch must be in the Start or Preheat position.
Theory of Operation: The ignition system is designed to inject diesel fuel into the piston cylinder where heat from compression ignites the
fuel and air mixture. When starting a cold engine, compression may not provide enough heat to ignite the fuel. A manifold heater is installed
to preheat the incoming air and provide added heat to the
combustion chamber. The heater is energized (heated) when the key switch is
placed in the start or preheat position.

My Yanmar 1610 had a system where it ignited some fuel in the intake and this one has a heating coil in the intake, both activated by turning the key counter clockwise. Neither had glow plugs. The fuel igniter worked better than the heating coil but I don't think either are intended to be used for every start.