Yanmar 6LY3 series Service Manual page 43

Periodic Maintenance Procedures
12/05
Bleeding Air from Fuel System
1. Check the fuel level in the tank and fill if
necessary.
2. Loosen the air bleed bolt at the top of the
fuel / water separator by turning it 2 to 3 turns.
Pump fuel with the fuel feed pump by moving
the knob on the top of the feed pump up and
down. When no air bubbles come out of the bolt
hole, tighten the air bleed bolt.
3. Because the automatic air-bleed system is
used on the fuel filter, there is no air bleed bolt
on the fuel filter. Continue to pump fuel with the
fuel feed pump by moving the knob on top of
the feed pump up and down. Stop pumping
when the knob becomes stiff. This completes
the air bleeding of the fuel system. Try starting
the engine again.
4. After start-up, the automatic air-bleeding device
will purge the air from the fuel system. No
manual air bleeding is required for normal
engine operation.
6LY3 Service Manual
Check the Battery Electrolyte Level
WARNING! ALWAYS turn off the battery switch
or disconnect the negative (-) cable before
inspecting the electrical system. Failure to do
so could cause short-circuiting and fires.
Always disconnect the negative (-) battery cable
first. An accidental short circuit may cause
damage, fire and / or personal injury. ALWAYS
connect the negative (-) battery cable (back
onto the battery) LAST.
WARNING! Keep the area around the battery
well-ventilated, paying attention to keep the
battery away from any fire source. During
operation or charging, hydrogen gas is
generated from the battery and can be easily
ignited.
WARNING! Make sure your eyes and skin do
not come in contact with the fluid. The battery
electrolyte is dilute sulfuric acid and causes
severe acid burns. If you come in contact with
electrolyte, wash and rinse it off immediately
with a large amount of fresh water and baking
soda.
Battery Parts
Figure 4-7
(8)
1 – Terminal
2 – Cap
3 – Cover
4 – Cathode Plate
5 – Separator
6 – Glass Mat
7 – Zinc Anode Plate
8 – Battery Case
© 2007 Yanmar Marine International
PERIODIC MAINTENANCE
(2)
(1)
Figure 4-7
(3)
(4)
(5)
(6)
(7)
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