Thermo King SGCO 3000, Manual

Page: 95 / 144

Engine Maintenance
95
Engine Thermostat
TK486V engines use a 71 C (160 F) thermostat.
Engine Fuel System
TK486V engines use a mono-plunger and
distributor injection pump.
The components of a typical fuel system include:
1. Fuel tank
2. Fuel strainer (inlet to transfer pump)
3. Fuel filter
4. Water separator
5. Hand fuel pump
6. Transfer pump
7. Injection pump
8. Injection nozzles
The hand fuel pump is used to manually draw fuel
from the tank up to the transfer pump if the unit
should run out of fuel.
The transfer pump draws fuel from the fuel tank
through a fuel inlet strainer at the inlet to the
transfer pump. The transfer pump then delivers
fuel through the fuel heater to the fuel filter/water
separator. Filtered fuel passes through a line from
the outlet fitting on the filter base to the injection
pump.
The injection pump forces the fuel, at a very high
pressure, through the injection nozzles. The
injection nozzles atomize the fuel as it is injected
directly into the combustion chambers.
Injection pump leakage, injection nozzle overflow
and excess fuel from the fuel filter assembly
return to the fuel tank through the return lines.
Maintenance
The fuel system is relatively trouble-free and if
correctly maintained will usually not require
major service repairs between engine overhauls.
Contamination is the most common cause of fuel
system problems. Therefore, to ensure best
operating results, the fuel must be clean and fuel
tanks must be free of contaminants. The single
element fuel filter/water separator must be
changed according to the Service Guide in the
Introduction of this manual or the Maintenance
Inspection Schedule on the unit.
NOTE: The injection nozzles must be tested (and
repaired if necessary) at least every 3,000 hours
in accordance with EPA 40 CFR Part 89.
Normal conditions are considered to be the use
of clean high quality fuel, no used oil blending,
and regular maintenance of the fuel system
according to the Maintenance Inspection
Schedule. Refer to the TK482 and TK486
Overhaul Manual TK 50136 for injection nozzle
testing and repair procedures.
Whenever the fuel system is opened, take the
following precautions to prevent dirt from
entering the system:
• Cap all fuel lines.
• Work in as clean of an area as possible.
1. Thermostat
2. Jiggle Pin
3. Install This End Toward Engine
Figure 56: Engine Thermostat
AJA2067
AJA2061
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