Volvo Penta TAMD71B Instruction Manual page 45

9.7.4 Venting the fuel system
The fuel system must be vented after the fuel fil-
ters have been replaced or after refilling the fuel
tank after it has been run dry.
1. Place a container beneath the fuel filters.
Open vent screw (1) on the filter mounting.
2. Pump fuel using the feed pump's hand pump
(2) until no air bubbles are visible in the fuel.
Tighten the screw while fuel is flowing.
3. Pump a further 10–20 strokes with the vent
screw closed so that sufficient feed pressure
is obtained. Further venting is not normal-
ly required.
If the injection pump needs to be vented any-
way, undo the overflow valve (3) connection
at the pump and continue to pump by hand
until no air bubbles are visible in the fuel.
Tighten the connection while fuel is flowing.
Pump a further 10–20 strokes so that suffi-
cient feed pressure is obtained.
4. Check for leaks.
9.7.5 Injectors. Checking
1. Clean around the injectors.
2. Remove the pressure line and the return fuel
line. Remove the mouting yoke on the injec-
tors.
3. Turn the injector carefully backwards and for-
wards using a wrench (size 15 mm), pulling it
up at the same time.
Note: If the injector is stuck, you must use a
special tool to remove it. The copper sleeve
around the injector may otherwise be pulled
out as well, with water in the engine as a
consequence.
The coolant in the freshwater system can be
drained as an extra safety measure before
removing the injectors.
4. Hand in the injectors to a an authorized ser-
vice workshop for checking.
5. Fit the injectors with a protective ring (1).
Tightening torque 50 Nm (5 kpm/36 ft.lb.).
6. Reinstall the fuel leak-off line. Reinstall the
pressure pipes. Check that these are not
crooked, then tighten the nuts. Tightening
torque 15–25 Nm (1.5–2.5 kpm/11–18 ft.lb.).
7. Fill the engine with coolant if this has been
drained. Start the engine and check for
leaks.
AB Volvo Penta / Diesel Engine TAMD71B
Fig. 9.13 Venting the fuel system
1. Venting screw on filter mounting
2. Hand pump
3. Overflow valve
4. Pressure equalizer
Fig. 9.14 Injectors
1. Protective ring (rubber)
2. Leak-off fuel line
3. Pressure line connection
4. Mounting yoke
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