Engine Maintenance (Rev. 04/03)
58
TK 3.95 ENGINE
Operation of the TK 3.95 engine is controlled by the opera-
tion of the fuel solenoid and the throttle (high speed) sole-
noid. The fuel solenoid consists of a spring loaded plunger
and electro-magnetic coil. When the engine is OFF, spring
tension on the plunger maintains the plunger’s “out” posi-
tion. When pushed out, this causes the governor linkage to
move the injection pump rack to the “Fuel Off” position.
When the fuel solenoid is energized, current is applied to
the coil creating an electro-magnetic field, which pulls the
plunger in. When the solenoid is in the “pulled-in” position,
the plunger releases tension on the governor linkage. The
governor linkage then moves the fuel injector rack, thus
controlling the fuel flow and placing it in the “Fuel On”
position.
Adjustments made to the throttle (high) speed solenoid
change governor spring tension which in turn adjust speed
settings.
Fuel Solenoid Diagnostic and
Replacement
• Refer to the Interface Board diagnostic procedures in
the Thermoguard µp-T Controller Operation and Diag-
nosis Manual TK 41087 sections 3 and 4.
Fuel Solenoid Components
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