Westerbeke 12.0KW - 50Hz EDT Installation Manual download pdf (Page 22)

COOLING

SYSTEM

Refilling

the

Coolant

After replacing the engine block drain plug, close the heat

exchanger's coolant petcock. Then pour clean, premixed

coolant into the manifold and when the coolant is visable in

NOTE:

Open

the

air-bleed petcock

the

thennostat

housing.

Fill

the

system and watch for antifreeze coolant

flow

from

the

petcock then close

the

petcock.

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

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

the

recovery

tank

needed. Clean up any spilled coolant.

COOLANT

RECOVERY

TANK

MAKE

CERTAIN

THESE

PASSAGES

ARE

KEPT

CLEAR

COOLANT

RETRACTfON

NOTE:

Periodically

check

the

condition

the

rrulnifold

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

spare

cap.

THERMOSTAT

A thermostat, located near the manifold at the front

the

engine, controls the coolant temperature

as the coolant contin-

uously 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

prevent the exhaust manifold from overheating).

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.

Replacing

the

Thermostat

Remove the cap screws and disassemble the thermostat hous-

ing

as shown. When installing the new thermostat and gas-

ket, apply a thin coat

sealant on both sides

the gasket

before

pressing it into place.

not over-tighten the cap

screws:

Run the engine and check for normal temperatures and that

there are no leaks at the thermostat housing.

COOLANT

TEMPERATURE

SWITCH

THERMOSTAT

ASSEMBLY

RAW

WATER

COOLING

CIRCUIT

BLEED

PETCOCK

THERMOSTAT

~COOlANT

TEMPERATURE

SENDOR

The

raw water flow is created by a positive displacement

impeller pump. This

pump

draws water directly from the raw

water source (ocean, lake,

river) through a hose to the

water strainer. The raw water passes from the strainer

through the raw water pump to the heat exchanger (through

the heat exchanger tubes) where

it cools the engine circulat-

ing fresh water coolant. The raw water is then discharged

into the water-injected exhaust elbow, mixing with and cool-

ing the exhaust gasses.

This mixture

exhaust gas and raw

water is discharged overboard by the engine's exhaust

gas

discharge pressure.

Raw

Water

Pump

The

raw water pump is a self-priming, rotary pump with a

non-ferrous housing and a neoprene impeller.

The

impeller

has flexible vanes which wipe against a curved cam plate

within the impeller housing, producing the pumping action.

no account should this pump be run dry as water acts as a

lubricant for the impeller. There should always be a spare

impeller and impeller cover gasket (an impeller kit) aboard.

Raw water pump impeller failures occur when lubricant (raw

water) is not present during engine operation. Such failures

are not warrantable, and operators are cautioned to make sure

raw water flow is present at start-up.

NOTE:

Should

failure

occur

with

the

pump

internal

parts

(seals

and

bearings),

it may

cost efficient

pur-

chase a

new

pump

and rebuild

the

original pump

spare.

Engines & Generators

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Westerbeke 12.0KW - 50Hz EDT Installation Manual Page 22

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