ENGINE OPERATION
GM Series Operation Manual 41
12/05
Air Bleeding from the Fuel System
After Starting Failure
If the engine does not start after several
attempts, there may be air in the fuel
system. If air is in the fuel system, fuel
cannot reach the fuel injection pump.
Bleed the air from the fuel system
according to the following steps:
1. Check the fuel tank level.
2. Loosen the air vent bolt at the top of the
fuel / water separator. When fuel is free
of bubbles, retighten the air vent bolt.
3. Loosen the air vent bolts of the fuel
filter and fuel injection pump.
4. Pump fuel with the fuel feed pump by
moving the lever on the left side of the
fuel feed pump up and down.
5. Allow the fuel containing air bubbles to
flow out of the air vent bolt holes.
6. When the fuel no longer contains air
bubbles, tighten the air vent bolts.
7. Try starting the engine again.
Starting at Low Temperatures
Comply with local environmental
requirements. Do not use starting aids.
Using a starting aid may void the warranty.
Never use an engine starting aid such as
ether. Engine damage will result.
To limit white smoke, run the engine at low
speed and under moderate load until the
engine reaches normal operating
temperature. A light load on a cold engine
provides better combustion and faster
engine warm-up than no-load.
Avoid running the engine at idling speed
any longer than necessary.
After the Engine Has Started
After the engine has started, check the
following items at a low engine speed.
1. Check that the gauges, indicators and
alarm are normal.
2. Check for any water, fuel or engine oil
leaks. If any leaks are found, shut down
the engine and perform the necessary
repairs.
Never check for a fuel leak with your
hands. Always use a piece of wood or
cardboard. Have your authorized
Yanmar Marine dealer or distributor
repair the damage. Avoid skin contact
with the high-pressure diesel fuel
spray caused by a fuel system leak
such as a broken fuel injection line.
High-pressure fuel can penetrate
your skin and result in serious injury.
If you are exposed to high-pressure
fuel spray, obtain prompt medical
treatment.
3. Check that the smoke color, engine
vibration and sound are normal.
4. When there are no problems, keep the
engine at low speed with the boat still
stopped to distribute engine oil to all
parts of the engine.
5. Check that water is being discharged
from the seawater outlet pipe.
Operation with inadequate seawater
discharge will damage the impeller of
the seawater pump. If seawater
discharge is too low, stop the engine
immediately. Identify the cause and
repair.
GM_OM.book 41 ページ ２０１３年６月１０日 月曜日 午後２時２６分
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