Yanmar 4LHA-STZP Specifikace stáhnout pdf (Strana 18)

2.4 Major Servicing Parts

Name of Part Function

●Fuel filter

Removes dust and water from fuel.

The filter is a cartridge type, and the fuel element

should be replaced before clogging occurs.

A water separator is on the bottom of the filter and should be drained periodically

(for 4LHA-HTP/HTZP). For 4LHA-DTP/-DTZP/-STP/-STZP, drain the dust and water

periodicaly removing the drain plug at the bottom of filter.

●Fuel feed pump

Feeds fuel to the fuel injection pump builting-in the fuel injection pump (4LHA-HTP/-

HTZP).

For 4LHA-DTP/-DTZP/-STP/STZP, it is attached with the fuel injection pump.

●Fuel priming pump

This is a manual fuel pump. Moving the knob on the top of fuel filter feeds the fuel.

The pump is also used to bleed air from the fuel system (4LHA-HTP/-HTZP).

For 4LHA-DTP/-DTZP/-STP/-STZP, moving the knob on the fuel feed pump attached

with the fuel injection pump feeds the fuel to bleed air.

●Lube oil filter

Filters fine metal fragments and carbon from the lube oil.

The filter is a cartridge type and the filter element should be replaced before clogging

occurs.

［Cooling Water

System]

●Fresh water cooler

○Filler cap

○Sub tank

○Rubber hose

●Fresh water pump

●Seawater pump

This engine has two cooling water systems (for fresh water & for seawater). Fresh

water flows from the fresh water tank into the fresh water cooler, where the fresh

water is cooled by sea water.

The fresh water then flows into the cylinder block through the fresh water pump.

It further cools the turbocharger and goes back to the fresh water tank.

The fresh water cooler is a heat exchanger using sea water.

The filler cap mounted on the fresh water tank has a pressure regulating valve.

When the cooling water temp. rises and the pressure rises inside the fresh water

cooler, the pressure regulating valve releases vapor and hot water overflows to the sub tank.

The hose connects the filler cap and sub tank. Vapor and hot water discharged to the

sub tank.

When the engine stops and cooling water cools, the pressure in the cooling water

tank also drops to negative pressure. The filler cap valve then opens to suck water

back from the sub tank. This minimizes cooling water consumption.

The centrifugal water pump circulates fresh cooling water inside the engine.

The pump driven by the V-belt.

The rubber impeller-type pump is driven by gears. Do not operate it without seawater,

due to damage the impeller.

●Oil cooler

This heat exchanger cools high temp. engine oil by seawater.

●

Turbocharger

The pressurized intake air feeding device: the exhaust gas turbine is rotated by

the exhaust gas, and the power is used to rotate the blower.

This pressurises the intake air for sending to the cylinder.

●

Inter-cooler

This heat exchanger cools the pressurized intake air from the turbocharger with

seawater.

●Anticorrosive zinc

The metal area of the seawater cooling system is prone to electrical corrosion.

The anti-corrosive zinc is installed in the oil cooler, inter-cooler, etc. to prevent this.

The anti-corrosive zinc is itself reduced over time by electrical corrosion, so it must be

replaced at fixed intervals before it is completely consumed in order to ensure that the

metal area of the seawater cooling system remains fully protected.

●Name plate

Name plates are provided on the engine and have the model, serial number and other

data.

●Starter motor

Starts the engine powered by the battery.

●Alternator

Driven by belt, and generates electricity and charges the battery.

●Lube oil filler cap

Filler port for engine lube oil.

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