Engine Maintenance
98
Engine Thermostat
For the best engine operation, use a 180 F (82 C)
thermostat year round.
Engine Fuel System
The fuel system used on these diesel engines 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 fuel pump filter, 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 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.
1. Thermostat Housing
2. Gasket
3. Thermostat
4. Gasket
5. Water Pump
Figure 127: Water Pump Assembly and Thermostat
1
2
3
4
5
To Next Page
Loading...
Need help?
General
