Engine Maintenance
86
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 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.
The most common cause of fuel system problems
is contamination. It cannot be stressed enough that
the fuel must be clean, fuel tanks must be free
from contaminants, and the fuel filter must be
changed regularly. Any time that the fuel system
is opened up, all possible precautions must be
taken to keep dirt from entering the system. This
means all fuel lines should be capped when open.
The work should be done in a relatively clean
area, if possible, and the work should be
completed in the shortest time possible.
Summary of Contents for MD-MT
Page 4: ...4...
Page 10: ...Table of Contents 10...
Page 22: ...Specifications 22...
Page 43: ...Unit Description 43 Figure 15 Engine Side Door Open ARD041...
Page 48: ...Unit Description 48...
Page 128: ...Refrigeration Service Operations 128...
Page 134: ...Hilliard Clutch Maintenance 134...
Page 136: ...Structural Maintenance 136...
Page 148: ...Refrigeration Diagnosis 148...
Page 150: ...Remote Evaporator Specifications 150...
Page 152: ...Remote Evaporator Maintenance Inspection Schedule 152...
Page 156: ...Remote Evaporator Unit Description 156...
Page 160: ...Remote Evaporator Structural Maintenance 160...
Page 162: ...Remote Evaporator System Diagnosis 162...
Page 166: ...Wiring and Schematic Diagrams Index 166...
Page 167: ...167 MD RD MT Model 30 w In Cab Schematic Diagram Page 1 of 2...
Page 168: ...168 MD RD MT Model 30 w In Cab Schematic Diagram Page 2 of 2...
Page 169: ...169 MD RD MT Model 30 w In Cab Wiring Diagram Page 1 of 3...
Page 170: ...170 MD RD MT Model 30 w In Cab Wiring Diagram Page 2 of 3...
Page 171: ...171 MD RD MT Model 30 w In Cab Wiring Diagram Page 3 of 3...
Page 172: ...172 MD RD MT Model 30 w In Cab CYCLE SENTRY Schematic Diagram Page 1 of 2...
Page 173: ...173 MD RD MT Model 30 w In Cab CYCLE SENTRY Schematic Diagram Page 2 of 2...
Page 174: ...174 MD RD MT Model 30 w In Cab CYCLE SENTRY Wiring Diagram Page 1 of 3...
Page 175: ...175 MD RD MT Model 30 w In Cab CYCLE SENTRY Wiring Diagram Page 2 of 3...
Page 176: ...176 MD RD MT Model 30 w In Cab CYCLE SENTRY Wiring Diagram Page 3 of 3...
Page 177: ...177 MD RD MT Model 30 CYCLE SENTRY Wiring Diagram Page 1 of 3...
Page 178: ...178 MD RD MT Model 30 CYCLE SENTRY Wiring Diagram Page 2 of 3...
Page 179: ...179 MD RD MT Model 30 CYCLE SENTRY Wiring Diagram Page 3 of 3...
Page 180: ...180 MD RD MT Model 50 w In Cab Schematic Diagram Page 1 of 2...
Page 181: ...181 MD RD MT Model 50 w In Cab Schematic Diagram Page 2 of 2...
Page 182: ...182 MD RD MT Model 50 w In Cab Wiring Diagram Page 1 of 3...
Page 183: ...183 MD RD MT Model 50 w In Cab Wiring Diagram Page 2 of 3...
Page 184: ...184 MD RD MT Model 50 w In Cab Wiring Diagram Page 3 of 3...
Page 185: ...185 MD RD MT Model 50 w In Cab CYCLE SENTRY Schematic Diagram Page 1 of 2...
Page 186: ...186 MD RD MT Model 50 w In Cab CYCLE SENTRY Schematic Diagram Page 2 of 2...
Page 187: ...187 MD RD MT Model 50 w In Cab CYCLE SENTRY Wiring Diagram Page 1 of 3...
Page 188: ...188 MD RD MT Model 50 w In Cab CYCLE SENTRY Wiring Diagram Page 2 of 3...
Page 189: ...189 MD RD MT Model 50 w In Cab CYCLE SENTRY Wiring Diagram Page 3 of 3...
Page 190: ...190 MD RD MT Model 50 CYCLE SENTRY Wiring Diagram Page 1 of 3...
Page 191: ...191 MD RD MT Model 50 CYCLE SENTRY Wiring Diagram Page 2 of 3...
Page 192: ...192 MD RD MT Model 50 CYCLE SENTRY Wiring Diagram Page 3 of 3...