Operation and Maintenance Manual for WP2.1C/WP3.9C Series Marine Diesel
6
Section
Ⅱ
Operation
of
the
Engine
2.1 Fuel, Lubricating Oil and Cooling Water
Fuel The fuel for the engines is the light diesel oil (grades10, 0, -10, -20 and -35)
specified in the China National Standard GB 252. The fuel for different working
conditions should be chosen according to the fuel specifications below:
Fuel Specifications
Grade of fuel 10 0 -10 -20 -35
Cetane value 50 50 50 48 43
Pour point( )℃
10 0 -10 -20 -35
Lowest ambient temperature(℃)
+18 +8 -2 -12 -23
Before using, diesel oil should be stored for at least 48 hours to settle down
impurities and then filtered with a silk cloth.
Lub.oil : The lubricating oil for the engine should be chosen from the products
specified in the China National Standard GB11122 according to ambient temperatures.
Proper grades of lubricating oil for different ambient temperatures are shown in the
table below.
Lub.oil Specifications
CF grade 10W 5W/30 10W/30 15W/30 15W/40 20W/40 20W/20 30 40
Ambient
-20-5
-25-25 -20-20 -10-25 -10-35 -10-30 -10-10 5-30
＞25
Check the oil level with the dipstick at least 5 mins after refilling or stopping the
engine.
Coolant : Coolant for diesel engines should be clean soft water, such as water
from rain, snow or clean rivers. In case of hard water, such as water from wells and
fountains,
it should be softened beforehand. There are two methods of doing it.
(1) To boil up the hard water.
(2) To add caustic soda into hard water (20 grams of caustic soda for 30 liters
of hard water).
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