PRODUCT OVERVIEW

16 JH Series Operation Manual

FUNCTION OF MAJOR COMPONENTS

Name of Component Function

Fuel Filter The fuel filter removes contaminants and sediments from the diesel fuel. Periodic replacement

of the fuel filter is necessary. See Periodic Maintenance Schedule on page 60 for the

replacement frequency.

Fuel pre-filter

(Water separator)

The water separator removes contaminants, sediment and water from diesel fuel going to the

fuel filter. This is a required component of the fuel system and is standard equipment with

every engine. The water separator is installed between the fuel tank and the fuel feed pump.

Periodically drain the water from the water separator using the drain cock at the bottom of the

separator and replace the filter element.

Fuel Priming Pump This is a manual fuel pump. Pushing the knob on the top of the fuel pre-filter feeds the fuel.

This pump is also used to bleed air from the fuel system.

Engine Oil Filler Port Filler port for engine oil.

Engine Oil Filter Filters fine metal fragments and carbon from the engine oil. Filtered engine oil is distributed to

the engine’s moving parts. The filter is a cartridge type and the element should be replaced

periodically. See Changing the Engine Oil and Replacing the Engine Oil Filter Element on

page 73.

Marine Gear Filler Port Filler port for marine gear lube oil. Located on top of the marine gear case.

Cooling System There are two cooling systems: closed cooling with coolant and seawater. The engine is

cooled by the closed cooling circuit. The closed circuit is cooled by seawater using a heat

exchanger. The seawater also cools the engine/marine gear oil and intake air (depending on

model) through the cooler(s) in an open circuit.

Coolant pump The centrifugal water pump circulates coolant inside the engine. The circulating pump is

driven by a V-ribbed belt.

Seawater Pump Pumps seawater from outside vessel to the engine. The seawater pump is gear-driven and

has a replaceable rubber impeller. Do not operate it without seawater, as this will damage the

impeller.

Reservoir The pressure valve in the filler cap releases vapor and hot water overflow to the reservoir.

When the engine stops and the coolant cools, the pressure in coolant tank drops. The filler

cap vacuum valve then opens to send water back from the reservoir. This minimizes coolant

consumption. The closed cooling system coolant level can easily be checked and refilled in

this tank.

Oil Cooler - Engine A heat exchanger that cools high temperature engine oil using coolant.

Oil Cooler - Marine Gear

(Optional)

This heat exchanger cools the marine gear (KMH4A) oil using seawater.

Turbocharger (if equipped) The turbocharger pressurizes the air coming into the engine. It is driven by a turbine that is

energized by exhaust gases.

Air cooler (if equipped) This heat exchanger cools the pressurized charging air from the turbocharger with seawater

to increase the charging air quantity.

Intake Silencer (Air Cleaner) The intake silencer guards against dirt in the air and reduces the noise of air intake.

Nameplates Nameplates are provided on the engine and the marine gear and have the model, serial

number and other data.

Starter Starter motor for the engine. Powered by the battery.

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

Engine Oil Dipstick Gauge stick for checking the engine oil level.

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