Volvo Penta AQ205 Operator's Manual page 12

CHECKS AND SERVICE
CARBURATOR
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Correct carburator adjustment is a "must" if the
engine is to operate correctly and at optimum fuel
economy. For this reason you should allow an au-
thorised workshop to check the adjustment some
time during the season.
Adjust the idling setting as follows:
1 Run the engine until it has reached its working
temperature and the choke has opened fully.
2 Adjust the idling speed (see under "Technical
Data") with the slow running screw (1).
3 Check that there is no air leakage between the
carburetor and the induction pipe (a leakage in-
creases the engine speed).
Adjust the fuel/air mixture with the bleed screw
(2) so that the best and most regular idling is
achieved. Begin by screwing in the bleed screw
until the engine starts to run rough, then screw
out the screw until the best idling conditions are
reached. Finely adjust the engine speed with the
slow running screw if necessary.
The carburetor's fuel filter
The carburator is fitted with a fuel filter in the fuel
line connection next to the carburator.
Check the filter at least once a season or as re-
quired
Check: Undo the fuel line and remove the nipple
in the filter housing (be careful not to spill fuel).
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The filter can now be removed for checking.
(Wash in solvent.) Be careful of the spring inside
the filter. Refit in the reverse order. The filter's
closed end must face into the carburator. Check
the seal between the nipple and the filter housing.
Start the engine and check that all connections
are tight.
Fuel filter by the fuel pump
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The fuel filter must be replaced once per season
or after every 100 hours of operation. Remove the
filter, discard it and install a new one. Watch out
not to spill fuel!
CHECKING THE COOLING SYSTEM
The temperature gauge for the coolant has a
green area – this indicates the normal coolant
temperature in the engine.
Check the cooling system immediately in the
event of abnormal temperatures.
Excessive temperature may be caused by a
blocked water inlet, defective pump impeller in
the sea water pump, blockages in the cooling gal-
leries or an unserviceable thermostat or instru-
ment.
WARNING! Be careful of water penetra-
tion when working on the cooling sys-
tem.
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