Ingersoll-Rand Thermo King SGCM 4000, Maintenance Manual, Page: 133 / 181

Engine Maintenance
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4. Flip the expansion tank upside down and right side up to see if the float moves inside the expansion
tank. Replace the expansion tank with a new one if the float is stuck or does not move with the coolant
level.
Replacing the Coolant Level Switch
1. Disconnect the wire harness connector from the coolant level switch.
2. Turn the coolant level switch 1/4 turn to loosen it and remove it from the tank.
3. Place the new coolant level switch in the tank. Align the tabs on the switch with the slots in the tank
and turn the switch 1/4 turn to tighten it.
4. Connect the wire harness connector to the coolant level switch.
NOTE: For checking the remaining components of the PCM Engine - i.e. RPM sensor, oil sensor, air
flow meter, etc. Refer to the EXXOTOOL tool or check continuity of the harness.
Engine Fuel System
DV6NR engine uses a common rail fuel injection system.
The components of the fuel system are:
• Fuel tank
• Electric fuel pump
• Fuel filter/water separator
• High pressure fuel pump
• Common (high pressure fuel) rail
• Electronic injection nozzles
Figure 55: Fuel System