Major Servicing Parts - Yanmar 4LHA-HTP Operation Manual

2.4 Major Servicing Parts

Name of Part Function
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 .
Fuel filter
(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.
Feeds fuel to the fuel injection pump builting-in the fuel injection pump (4LHA-HTP/-
Fuel feed pump HTZP).
For 4LHA-DTP/-DTZP/-STP/STZP, it is attached with the fuel injection 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).
Fuel priming pump
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 filler cap
Filler port for engine lube oil.
Filters fine metal fragments and carbon from the lube oil.
Lube oil filter The filter is a cartridge type and the filter element should be replaced before clogging
occurs.
This engine has two cooling water systems (for fresh water & for seawater). Fresh
Cooling Water
water flows from the fresh water tank into the fresh water cooler, where the fresh
System]
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.
Fresh water cooler
The fresh water cooler is a heat exchanger using sea water.
Filler cap
The filler cap mounted on the fresh water tank has a pressure regulating valve.
Sub tank
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.
Rubber hose 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.
Fresh water pump
The centrifugal water pump circulates fresh cooling water inside the engine.
The pump driven by the V-belt.
Seawater pump
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.
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.
Turbocharger
This pressurises the intake air for sending to the cylinder.
This heat exchanger cools the pressurized intake air from the turbocharger with
Inter-cooler
seawater.
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
Anticorrosive zinc
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 plates are provided on the engine and have the model, serial number and other
Name plate
data.
Starts the engine powered by the battery.
Starter motor
Driven by belt, and generates electricity and charges the battery.
Alternator
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