Daewoo DTA-1420P Manual de usuario descargar pdf (Pagina 7)

How to tell if a water pump is defective

1. Check for shaft seal failure by carefully

inspecting the water pump weep hole. When a

water pump is new, some seepage is normal in

the initial hours of operation as the seal seats.

Other than that, any leakage that occurs is due

to seal failure and the pump needs replacement.

There may be tell tale trails of rust, calcium and

coolant deposits on the water pump housing with

the weep hole as the origin.

2. Detect a worn water pump bearing by

checking for side-to-side play at the shaft.

There should be no perceptible play as you

apply hand pressure to the shaft. Accelerated

bearing wear is characterized by screeching or

rumbling noises coming from the water pump

housing. If any of these conditions exist, the

bearing is worn out and the pump should be

replaced.

How to tell if a fan clutch is defective

1. Check for oil streaks (or dust collected on oil

streaks) on the fan clutch. It’s a sure sign that

the internal fluid that provides the clutch action

is leaking.

2. To check for a worn bearing, grasp the fan

blade on either end, with the engine off, and

check for lateral movement. If there is more than

1/4” of side-to-side movement, the bearing is

worn and the unit needs replacement.

3. In checking for proper fan clutch operation,

first run the engine until operating temperature is

reached. Next, with the engine off, give the fan

blade a gentle spin. If it rotates more than twice

the clutch is worn and needs replacing. If fan

rotation is rough or noisy, or the fan fails to turn,

the unit is worn out and needs replacement.

Coolant

Coolant, flowing through the hot engine,

transfers the heat to itself for dissipation in

the radiator. In addition to providing

improved performance over plain tap

water, most leading anti-freeze products

contain anti-rust and corrosion additives

that prevent sediment build-up and pre-

mature cooling system component failure.

Coolant Recovery Tank

The coolant recovery tank serves as a

reservoir. It receives coolant expelled from

the cooling system through the pressure

valve in the radiator cap. It holds the

expelled coolant for reintroduction into the

cooling system when needed. When addi-

tional coolant is needed in the system, it

should be added to the recovery tank, not

directly to the radiator.

Fan

The fan pulls cool air through the radiator

to aid heat-transfer from the coolant.

Fan Clutch

The fan clutch is designed to keep the

optimum amount of air flowing through the

radiator. At slow vehicle speeds, the fan is

required to move enough air through the

radiator to insure proper cooling. At high-

way speeds the airflow through the radia-

tor is sufficient to provide proper cooling

without the aid of the fan. The clutch lets

the fan free wheel at highway speeds,

reducing horsepower loss.

Belts

The belts are responsible for driving the

water pump, as well as other accessories.

Be sure they are in good shape and

adjustment, not worn, cracked or slipping.

Never over tighten belts. Over tightened

belts put unnecessary side-load pressures

on the water pump impeller shaft and

bearings. Premature water pump failure is

inevitable.

Hoses

Radiator hoses are responsible for carry-

ing coolant to and from the engine from

the radiator. They should be regularly

checked for signs of advanced deteriora-

tion, such as bulging and cracking.

Healthy hoses should be pliable. Not soft

and spongy, or hard and brittle. Any sign

of leakage could mean its time for

replacement.

Thermostat

The thermostat is responsible for regulat-

ing the flow of coolant into the engine

block. It keeps the engine block at its

optimum operating temperature. When the

engine is cold, the thermostat closes to

restrict coolant flow and allow the engine

to quickly reach a satisfactory operating

temperature. As the engine heats up, the

thermostat opens and allows more coolant

to circulate. A sticky thermostat can stop

or restrict coolant flow to the engine.

Water Pump

The water pump delivers a continuous

flow of coolant through the radiator and

through the engine. A paddle style

impeller mounted inside the water pump

housing, rotating on a bearing supported

shaft, is responsible for moving the

coolant. The impeller shaft is driven exter-

nally by a pulley/belt combination that’s

connected to the crankshaft pulley.

Keeping the coolant clean and fresh and

the belts properly tensioned is about all

the maintenance the water pump requires.

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Daewoo DTA-1420P Manual de usuario Pagina 7

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