2. Product explanation 2.4 Major Servicing Parts 16 Name of part Decompression lever Fuel filter Function Opens thee xhaust valve and releases the pressure for manual starting. Removes d ust and water from fuel. Drain the filter periodically. The internal elem ent (filter) should be changed periodically. - Fuel feed pump, Feed fuel to the fuel injection pump. Moving the priming Priming lever lever up and down feeds the fuel. When there is no fuel, the priming lever is used to b leed air from the fuel system. - - - - Filler port (engine) Filler port fo r eng1ne lube oil. Filler port (marine gear) Filler port fo r marine gear lube oil.
Lube oil filter Filters fine m etal fragments and carbon from the lube oil. Filtered lube oil is distributed to the engine's moving parts. ---1-- Cooling Water System There are t wo types of cooling systems: direct seawater cooling and fresh water cooling. Seawater cooling The seawat er pump feeds seawater. The flow is controlled automatically by a thermos tat which measures the temperature during operation. Anticorrosion zinc The metal area of the seawater cooling system is prone to electrical corrosion. T he anticorrosion zinc is Installed in the cylinder block and/or cylinder hea d to prevent this.
The anticorrosion zinc is Itself reduced over time by ele ctrical corrosion, so It must be replaced at fixed intervals before It is c ompletely consumed In order to ensure that the metal area of the seawate r cooling system remains fully protected. Fresh water cooling Fresh water pump There are tw o cooling systems: fresh water and seawater. The fresh wa ter pump is run by the alternator and the V-belt. Fresh water coolmg The fresh w ater in the fresh water cooler is fed to the engine by the fresh water pump. The cooling fresh water returns to the eng1ne after it is cooled with seawater in the fresh water cooler.
Filler cap The filler cap on the cooling water tank covers the water supply port. The cap has a p ressure regulating valve. When the cooling water temp. rises, the pressure rises inside the fresh water cooler. ______ : __ __ Subtank The pressure regulating valve releases vapor and hot water overflow to the subtank The hose c onnects the filler cap and subtank. Vapor and hot water discharged to the subtank return there to the cooling water. When the engine stop s and cooling water cools, the pressure In the cooling water tank also dro ps very low. The filler cap valve then opens to send water back from th e subtank. This min1mizes cooling water consumption.
Fresh water pump The centrifu gal water pump circulates fresh cooling water inside the engine. The pump and alternator are dnven by the V-belt. The fresh water pump is on engines using fresh water cooling. Intake air silencer This is the al r Intake silencer. The silencer guards against dirt in the air and reduces the noise of air intake. ----1-- Name plate Name plate s are provided on the engine and the marine gear and have ---l-th-e -model, se rial number and other data. Starter Starter motor for the engine. Powered by the battery. Alternator Rotates by b elt drive, generates electricity and charges the battery.