Thermo King MD-MT, Operator'S Manual

Page: 88 / 192

Engine Maintenance
88
Thermo King recommends that any major
injection pump or nozzle repairs be done by a
quality diesel injection service specialty shop. The
investment in equipment and facilities to service
these components is quite high. Therefore, this
equipment is not found in most repair shops.
The following procedures can be done under field
conditions:
• Bleeding air from the fuel system
• Maintenance involving the fuel tank and filter
system
• Speed and governor adjustments
• Electric transfer pump replacement or repair
(10 psig [69 kPa] pump with diesel filter)
• Injection line replacement
• Pump timing
• Nozzle spray pattern testing and adjustment
• Minor rebuilding of nozzles.
Bleeding the Fuel System
The fuel system will have to have the air bled out
if the engine runs out of fuel, if repairs are made
to the fuel system, or air gets into the system for
any other reason.
NOTE: MAKE SURE to keep the fuel tank vent
open. If the vent becomes clogged, a partial
vacuum develops in the tank, and this increases
the tendency for air to enter the system.
Bleeding Procedure:
1. Loosen the bleeder screw on the inlet fuel
fitting of the injection pump.
2. Turn on the electric fuel pump. The electric
fuel pump is energized when the On/Off
switch is turned On.
3. Tighten the bleeder screw on the injection
pump when clear flow of fuel appears.
NOTE: At initial start-up, open the bleeder
screw at the injection pump and bleed fuel
until a clear flow is noted.
4. Loosen the injector lines on the injection
nozzles.
5. Crank the engine until fuel appears at the
nozzles. Tighten the injector lines, and start
the engine.
NOTE: Fuel will not appear at the nozzles by
merely running the electric pump. The
engine must be cranked.
Water in the Fuel System
Water in the fuel system can damage the injection
pump, nozzles and prechamber. This damage will
subsequently cause more expensive damage to the
engine. A large accumulation of water in the
bottom of the fuel tank will stop a diesel engine.
Water should be drained off periodically to avoid
breakdowns. This should be done after the tank
has set idle for an hour. Do not steam clean fuel
tank caps.
Fuel Filter Replacement
1. Remove the filter and discard.
2. Lubricate rubber ring of new filter with fuel.
3. Install the filter and tighten until the filter is
slightly loose (rubber ring not making
contact).
4. Bleed the air from the filter by operating the
electric pump until fuel bubbles appear at the
top of filter.
5. Tighten the filter until the rubber ring makes
contact, then tighten 1/2 turn more.