Engine Maintenance
64
Engine Thermostat
For the best engine operation, use a 180 F (82 C)
thermostat year round.
Engine Fuel System
The fuel system used on the Thermo King
TK 3.74 diesel is a high pressure system used in
conjunction with a prechamber.
The components of the fuel system are:
•
Fuel tank (may be the truck fuel tank)
•
Electric Fuel pump
•
Fuel filter
•
Injection pump
•
Injection nozzles
A 10 psig (69 kPa) electric fuel pump pulls fuel
from the fuel tank through a prefilter, then pushes
it to the fuel filter, and to the injection pump. The
prefilter is designed for diesel fuel and is the only
type that should be used.
The injection pump plungers are activated by an
extension on the engine camshaft. The governor
sleeve and weight assembly is mounted on the end
of the crankshaft with governor’s speed
requirements being relayed to the injection pump
through a linkage arrangement located in the front
timing cover. The injection pump raises the
pressure of the fuel and meters the correct amount
of fuel to the nozzle at the correct time. The
increased fuel pressure will lift the spring loaded
nozzle to admit fuel into the combustion chamber.
The fuel system is relatively trouble free, and if
properly maintained will usually not require major
service repairs between engine overhauls.
1.
Thermostat Housing
2.
Gasket
3.
Thermostat
4.
Water Pump
Figure 36: Water Pump Assembly and Thermostat
Summary of Contents for 919180
Page 4: ...4...
Page 10: ...Table of Contents 10...
Page 32: ...Unit Description 32 Unit Photographs Figure 3 Front View Figure 4 Back View AJA584 AJA585...
Page 33: ...Unit Description 33 Figure 5 Left Side View Figure 6 Right Side View AJA586 AJA58...
Page 35: ...Unit Description 35 Figure 8 North American Power Receptacle Box AJA58...
Page 38: ...Unit Description 38...
Page 58: ...Electrical Maintenance 58...
Page 66: ...Engine Maintenance 66 Figure 37 Fuel and Oil System Components...
Page 84: ...Engine Maintenance 84...
Page 96: ...Refrigeration Maintenance 96...
Page 118: ...Hilliard Clutch Maintenance 118...
Page 136: ...Cycle Diagrams 136...
Page 140: ...Wiring and Schematic Diagrams Index 140...
Page 141: ...141 Truck S Model SR 30 Schematic Diagram Page 1 of 2...
Page 142: ...142 Truck S Model SR 30 Schematic Diagram Page 2 of 2...
Page 143: ...143 Truck S Model 30 Units with P T Wiring Diagram Page 1 of 2...
Page 144: ...144 Truck S Model 30 Units with P T Wiring Diagram Page 2 of 2...
Page 145: ...145 Truck S Model 50 Schematic Diagram Page 1 of 2...
Page 146: ...146 Truck S Model 50 Schematic Diagram Page 2 of 2...
Page 147: ...147 Truck S Model 50 Units with P T Wiring Diagram Page 1 of 2...
Page 148: ...148 Truck S Model 50 Units with P T Wiring Diagram Page 2 of 2...