Westerbeke 20B TWO Manual de Instalação descarregar pdf (Página 22)

COOLING

SYSTEM

FRESH

WATER

COOLING

CIRCUIT

Fresh water coolant is pumped through the engine

circulating pump, absorbing heat from the engine.

The

coolant then passes through the thermostat into the manifold,

to the heat exchanger where it is cooled and returned to the

engine block via the suction side

the circulating pump.

When the engine is started cold, extemal coolant flow is

prevented

the closed thermostat (although some coolant

flow is bypassed around the thermostat to prevent

th~

exhaust

manifold from overheating).

the engine warms up, the

thermostat gradually opens, allowing full flow

the engine's

coolant to flow unrestricted to the external portion

the

cooling system.

ENGINE

COOLANT

WESTERBEKE

recommends a mixture

50% antifreeze

and

50% distilled water. Distilled water is free from the

chemicals that can corrode internal engine surfaces.

The antifreeze performs a double duty. It allows the engine

to run at proper temperatures

transferring heat away from

the engine to the coolant and lubricates and protects

the

cooling circuit from rust and corrosion. Look for a good

quality antifreeze that contains Supplemental Cooling

Additives (SCAs) that keep the antifreeze chemically bal-

anced, crucial to long term protection.

NOTE:

Look for the new environmentally friendly long lasting

antifreeze that is now available.

The recommended 50/50 mixture will protect the engine

against the most extreme temperature.

The

antifreeze mixture

will also retard rust within the engine and add to the life

the circulating pump impeller and seals.

A proper

50/50 mixture as recommended will protect the

engine coolant to temperatures

of-

40°F.

Coolant

Recovery

Tank

The coolant recovery tank allows for the expansion and con-

traction

the engines coolant during engine operation with-

out introducing air into the system. This recovery tank is

provided with fresh water cooled models and with the fresh

water coolant conversion kit

and

must

installed before

operating the engine.

NOTE:

This tank, with its short

plastic hose,

best

located at

above the level

the engines manifold.

NOTE:

Periodically check the condition

the pressure cap.

Ensure that the upper

and

lower rubber seals are

good

condition and check that the vacuum valve opens and closes

tightly. Carry a spare cap.

CHANGING

COOLANT

The engine's coolant must

changed according to the

MAINTENANCE SCHEDULE.

the coolant is allowed to

become contaminated, it can lead to overheating problems.

Drain the engine coolant

removing the block drain adja-

cent to the oil filter, remove the in-board drain plug on the

heat exchanger and remove the pressure cap from the water

jacketed exhaust manifold.

Refilling

the

Coolant

After closing the engine drains, pour clean, premixed coolant

into the manifold, start the engine and run it at a slow idle.

Monitor the coolant in the manifold and add as needed. Fill

the manifold to the filler neck

and

when the coolant is

flowing, install the pressure cap.

Remove the cap

the coolant recovery tank and

fill

with

coolant mix to halfway between

LOW

and

MAX

and replace

the cap.

Run

the engine and observe the coolant expansion

flow into the recovery tank.

After checking for leaks, stop the engine and allow it to cool.

Coolant should draw

back

into the cooling system as the

engine cools down.

Add

coolant to the recovery tank

needed. Clean up any spilled coolant

CAUTION:

The

engine

must

allowed

cool

down

before

attempting

these

procedures.

Not

only

the

surface

the

engine

hot

but

coolant

temperatures

can

19lf

CAUTION:

Proper

cooling

system

maintenance

critical;

substantial

number

engine

failures

can

traced

back·to

cooling

system

corrosion.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 71 72

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