Venting The Fuel System; Other Checks - Volvo Penta AD31L Instruction Book

Venting the fuel system

Venting must be carried out in the following cases
before the engine can be started:
❑ When a filter is replaced
❑ When the engine runs out of fuel
❑ When the injection pump has been removed
❑ When the fuel system is repaired
❑ Leakages or if the fuel lines are opened
❑ If the engine has not been run for a long time
Vent system as follows:
Open 4 turns. Avoid spilling fuel. Pump manually.
Close when there are no more air bubbles visible in
the fuel. If the pump effect is poor rotate the engine
a little.
If the engine does not start, continue bleeding.
Pump manually for approx. ½ minute for automatic
bleeding of the injection pump.
Undo all pressure pipe nuts. Set the speed control
to full speed. Run using the starter motor until fuel
appears. Avoid spillage. Tighten the nuts.

Other checks

Some checks and tasks require special knowledge
and we therefore recommend that you use an autho-
rised workshop. The following checks fall into this
category:
❑ Checking the Turbo compressor (200 hours)
❑ Adjusting the valves (200 hours)
❑ Checking the starter motor and alternator (200
hours)
❑ Checking the injectors (600 hours)
❑ Checking the electrical system (200 hours)
The cooling system operates normally when the
gauge shows 75–90°C (165-195°F). Overheating can
be caused by the following:
❑ Blocked seawater inlet, seawater filter or oil coo-
ler.
❑ Defective pump impeller and/or carrier in seawa-
ter pump.
❑ Air in freshwater system.
❑ Coolant level low.
❑ Slipping or broken drive belt for circulation pump.
❑ Faulty thermostat, temperature gauge or instru-
ments.
Avoid water penetration when working on the coo-
ling system.
WARNING! If the boat must be left with
parts of the cooling system removed,
make sure that water cannot leak into the
boat in an uncontrolled manner causing
it to sink.
Never top up the cooling system with water alone
since the coolant properties with respect to boiling
point, corrosion protection and frost protection may
be reduced.
Drain and flush the cooling systems once a year.
If the boat is used in water with a high salt content
or in abnormally contaminated water, it is important
for the seawater system to be flushed more often
with freshwater. This avoids the accumulation of de-
posits and salt crystals.
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