Operation and Maintenance Manual for WP2.1C/WP3.9C Series Marine Diesel
15
The lubricating oil filter cartridge is a spin-on canister. In case the cartridge is
seriously clogged, the bypass valve will open, allowing unfiltered oil to flow directly
to the main oil gallery in the cylinder block. Be sure to follow the instructions
described in Chapter V during maintenance operation of the oil filter. Replace the
filter cartridge if necessary. The pressure adjusting valve serves to adjust the oil
pressure in the main oil gallery and keep it within the range from 200kPa to 500kPa.
3.7 Cooling System
The engine has a pressure type cooling system. It consists of the radiator, fan,
water pump and thermostat.
When the engine cooling water temperature is below 73 , the thermostat is ℃
closed and
the cooling water is stopped from going to the radiator. It goes from the
thermostat housing back to the water pump. So the engine will be warmed up in a
short while. As the water temperature gets higher above 80 ,the thermostat opens ℃
gradually and lets the cooling water into the radiator. The cooling water from the
radiator goes through the tube and back into the water pump.
The water pump is of the centrifugal type. Its maintenance-free bearings need no
greasing. When water continuously leaks out from the weep hole in the bottom of the
pump housing due to excessive wear of the water seal, dismount the impeller from the
shaft and replace the water seal.（see Fig.8）
1. Radiator 2.
Thermostat
3.Fan 4. Water
pump
Fig. 8
3.8 Electrical System
The electrical system consists of the starting motor and a generator with a silicon
rectifier. Be sure to have the negative pole of the generator connected to the ground.
The electrical system voltage is 12V and the generator power output is 350W.
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