Isuzu 25 Manual page 6

of large diesel engines allow this; however for your diesel engine, do not use
diesel fuel, which has been contaminated with engine oil.
• Do not use any fuel additive (other than as recommended under "Biocide"
in this section). At the time this manual was printed, no other fuel additive
was recommended. (See your authorisation dealer to find out if this has
changed).
Fuel system air bleeding
The entry of air into the fuel system will cause difficult engine starting or engine
malfunction. When servicing such as emptying the fuel tank, draining the water
sedimentor, and the fuel filter element change is done, be sure to bleed air. Because
of the "automatic air-bleeding system" being employed, turn the starter switch to
the "" position and activate the "electromagnetic pump" to bleed the air.
Air Bleeding Procedure:
. When the "starter switch" is set to "" (ON) position to activate the
electromagnetic pump, fuel is forcibly sent to the fuel valve of each injection
pump and further to the leak-off pipe of each nozzle holder, where air in the
fuel leaks off automatically to the fuel tank.
2. Start the engine and check the fuel system for fuel leak.
CAUTION: the water/diesel fuel mixture is flammable and could be hot. To
help avoid personal injury and/or property damage do not touch the fuel coming
from the drain valve and do not expose the fuel to open flames or sparks. Be
sure you do not overfill the container. Heat (such as from the engine) can cause
the fuel to expand. If the container is too full, fuel could be forced out of the
container. This could lead to a fire and the risk of personal injury and/or vehicle
or equipment damage.
Biocides
In warm or humid weather, fungus and/or bacteria may form in diesel fuel if
there is water in the fuel.
NOTICE: fungus or bacteria can cause fuel systems damage by plugging the fuel
lines, fuel filters or injector. They can also cause fuel system corrosion.
If fungus or bacteria has caused problems, you should have your authorised
dealer correct these problems. Then, use a diesel fuel biocide to sterilise the fuel
system (follow the biocide manufacturers instructions). Biocides are available
from your dealer, service stations, parts stores and other automotive places.
See your authorised dealer for advice on using biocides in your area and for
recommendations on which biocides you should use.
Smoke suppressants
Because of extensive testing of treated fuel versus untreated fuel, the use of a
smoke suppressant additive is not recommended because of the greater possibility
of stuck rings and valve failure, resulting from extensive ash deposits.
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Lubricant
The quality of engine oil may largely affect engine performance, startibility and
engine life.
Use of unsuitable oil may result in piston ring stick, piston and cylinder seizure and
accelerate the sliding surface wear causing increased oil consumption, lowered
output and finally engine failure. To avoid this, use the specified engine oil.
Engine Oil Selection
Isuzu recommend that an API CC grade oil is used in all of its Isuzu marine
engines. Alternatively an API CD grade can be used if an API CC grade is
unavailable.
The correct grade oil is available from your local Isuzu marine dealer.
•  litres API CC W/40 – HMI part no - 700008-ALS
• 20 litres API CC W/40 – HMI part no - 700009-ALS