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46
TM 9-2320-312-24-2
Systems Operation Section
Air Inlet Heater
Valve System Components
The engines are equipped with an electric heater
that is located behind the air inlet elbow. The
electric heater has two functions:
Aid in starting
Aid in white smoke cleanup during start-up
Under the proper conditions, the ECM turns on
the electric heater. The following conditions are
evaluated prior to activating the electric heater:
Jacket water coolant temperature
Inlet manifold air temperature
Ignition switch position
Duration of time
The system is capable of delivering heat for 30
seconds prior to start-up and during cranking of the
engine. After the engine has started, the system is
capable of delivering heat constantly for 7 minutes,
or the system can cycle the heat for 13 minutes.
During the heating cycle, the heat is on for ten
seconds and the heat is off for ten seconds.
g00294195
Illustration 27
If the air inlet heater malfunctions, the engine will
Valve System Components
still start and the engine will still run. There may be
(1) Rocker arms. (2) Bridge. (3) Spring. (4) Pushrods. (5) Exhaust
a concern regarding the amount of white smoke that
valve. (6) Inlet valves. (7) Lifter. (8) Camshaft lobe.
is present. Also, there may be a concern regarding
the need for an alternative starting aid.
The valve system components control the flow of
inlet air into the cylinders during engine operation.
System Components
The valve system components also control the flow
of exhaust gases out of the cylinders during engine
The system of the air inlet heater consists of the
operation.
following basic components:
The crankshaft gear drives the camshaft gear
Relay of the air inlet heater
through an idler gear. The camshaft must be
timed to the crankshaft in order to get the correct
Heater element
relation between the piston movement and the valve
movement.
Coolant temperature sensor
The camshaft has two camshaft lobes for each
Inlet air temperature sensor
cylinder. The lobes operate the inlet and exhaust
valves. As the camshaft turns, lobes on the camshaft
ECM
cause lifters (7) to move pushrods (4) up and down.
Upward movement of the pushrods against rocker
Indicator lamp
arms (1) results in downward movement (opening)
of valves (5) and (6).
Each cylinder has two inlet valves and one exhaust
valve. Valve springs (3) close the valves when the
lifters move down.

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