Westerbeke 4.0Kw BCDB 50Hz Instrukcja Instalacji Pobierz pdf (Strona 20)

ENGINE

COOLING

CIRCUIT

Fresh

Water

Circuit

Fresh water coolant is pumped through the engine by a beIt-

driven circulating pump, absorbing heat from the engine. The

fresh water coolant circulates through the engine's block

absorbing heat, then passes through the thermostat into the

exhaust manifold, to the heat exchanger where it

cooled,

and then is returned to the engine block through the suction

side

the fresh water circulating pump. When the engine is

started cold, external coolant flow is prevented by the closed

thermostat (although some coolant flow is bypassed around

the thermostat to prevent the exhaust manifold from over-

heating). As the engine warms up, the thermostat gradually

opens, allowing full flow

the engine's coolant to flow

unrestricted

the external portion

the cooling system.

Coolant

Recovery

Tank

A coolant recovery tank allows for engine coolant expansion

and contraction during engine operation, without any signifi-

cant loss

coolant and without introducing air into the cool-

ing system. This

tank

should be located at or above the

engine manifold level and should be easily accessible.

CHANGING

COOLANT

The engine's coolant must

changed according to the

MAINTENANCE SCHEDULE.

the coolant

allowed to

become contaminated, it can lead to overheating problems.

CAUTION:

Proper

cooling

system

maintenance

critical;

substantial

number

engine

failures

can

traced

back

cooling

system

corrosion.

Drain the engine

cool~t

by removing the drain plug under

the manifold and opening the manifold pressure cap. Flush

the system with fresh water, then start the refill process.

NOTE:

The

drain plug

the heat exchanger

can

also

be used

drain

engine

coolant.

WARNING:

Beware

the

hot

engine

coolant.

Wear

protective

gloves.

Refill

With

Coolant

After replacing the manifold drain plug, run the engine at

idle and slowly pour clean, premixed coolant into the mani-

fold.

NOTE:

When

a steady flow

coolant appears at

the

heat

exchanger

drain

plug opening, close

the

drain

plug

and

jill

the

system until

the

manifold remains

full.

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

the manifold to the filler neck and install the manifold pres-

sure cap.

Remove the cap on 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 if

needed. Clean up any spilled coolant.

NOTE:

Periodically check

the

condition

the

manifold pres-

sure

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.

Use

a pipe

cleaner

keep

the

passageway clear

from

the

jiller

cap

the

recovery

tank

hose.

THERMOSTAT

A thermostat, located near the manifold

the front

the

engine, controls the coolant temperature, as it continuously

flows through the closed cooling circuit. When the engine

first started the closed thermostat prevents coolant from

flowing (some coolant is by-passed through a hole in the

thermostat to prevent the exhaust manifold from overheat-

ing), as the engine warms up the thermostat gradually opens.

The thermostat is accessible and can be checked, cleaned, or

replaced easily. Carry a spare thermostat and gasket.

RepJace

the

Thermostat

Remove the two cap screws and disassemble the thermostat

housing

shown. When installing the new thennostat and

gasket apply a

thin coat

sealant on both sides of the gasket

before pressing it into place. Do

NOT over-tighten the cap

screws.

Run the engine and check for nonnal temperatures and that

there are

leaks at the thermostat housing.

WATER

TEMPERATURE

SWITCH

CHANGING

THE

THERMOSTAT

WATER

TEMPERATURE·

SENDER

Engines

Generators

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 50 51

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