Thermo King 920000, Manual

Page: 84 / 190

Engine Maintenance
84
Bleeding Cooling System
After filling the radiator, run the unit up to
operating temperature to check for overheating
and coolant level and allow the air to be purged
for a few minutes.
After the engine has cooled, check coolant level
and add as necessary.
Engine Thermostat
For the best engine operation, use a 180 F (82 C)
thermostat year around.
Engine Fuel System
The fuel system used on the TK 3.95 diesel engine
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 9.4 to 11.5 psi (66 to 79 kPa) electric fuel pump
pulls fuel from the fuel tank and then pushes it
through the fuel filter to the injection pump.
The injection pump plungers are activated by a
gear driven injection pump camshaft. The
governor sleeve and weight assembly is mounted
on the end of the injection pump camshaft. The
governor’s speed requirements are relayed to the
injection pump through a linkage arrangement
located in the rear 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.
CAUTION: Do not remove the radiator
cap while the engine is hot.
1. Thermostat Housing
2. Gasket
3. Thermostat
4. Water Pump
Figure 37: Thermostat
AEA627