When Required - Mitsubishi SL-Series Operation Manual

6. Re-install the by-pass and cabin heater hoses,
if coolant reaches the top level and tighten the
clamps.
7. Bleed the air at the cabin heater system.
8. Run the engine for a few minutes at low idle
with the radiator cap open.
9. Stop the engine and check the coolant level;
fill-up if necessary, re-install the radiator cap.
10. Start and operate the engine until the coolant
temperature is between 70°C and 80°C
(158°F to 176°F). Check for any leaks. Then
stop the engine. Repair any leakage if
necessary.
11. Check the coolant level in the reservoir tank
and add water if the coolant level is low.
Maintain the coolant level to FULL line on the
tank when the engine is cold.
6.7

When required

6.7.1 Prime fuel system
Air in the lines may cause the fuel system to
become air bound, resulting in an inability to start
the engine or the misfiring of one or more
cylinders. Prime the fuel system:
1. After the engine has been fueled for the first
time after installation.
2. After the engine has been refueled after
running out of fuel.
Operation Manual Mitsubishi SL-Series diesel engines
Version 08/2004
3. After the fuel filter element has been cleaned
or replaced.
6.7.2 Procedure
Fuel filter with air valve
1. Turn the valve lever to the AIR position and
feed the fuel.
2. If the fuel flows free of bubbles through the
fuel return pipe, turn the valve lever to the ON
position.
Fuel filter with air vent screws
1. Loosen the air vent screw (1). Tighten the
screw when the fuel flows free of bubbles.
2. Loosen the air vent screw (2). Tighten the
screw once the fuel flows free of bubbles.
NOTE
The injection pipes and nozzles can be primed
by cranking the engine. The fuel system of the
engine equipped with an electric fuel pump can
be primed by turning the starter switch key to the
ON position.
Fuel filter with
air valve
AIR
VENT
6.7.3 Clean/change air cleaner element
Service the air cleaner only when it is necessary,
or when the dust indicator indicates RED.
6.7.4 Cleaning
1. Direct air — 7 kgf/cm
maximum — inside the element along the
length of pleats.
2. Insert a light inside the clean element and
check. Replace the element if rips or tears are
found.
ENGLISH
MAINTENANCE
Fuel filter with
air vent screws
1 2
OFF
1 2
ON
2
(100 psi) [686 kPa]
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