Daewoo Nubira. Manual - part 139

1D – 10

I

ENGINE COOLING

DAEWOO V–121 BL4

COOLANT PUMP

Removal Procedure

1.  Drain the engine cooling system to a level below

the thermostat housing. Refer to ”Draining and Re-
filling the Cooling System” in this section.

2.  Remove the timing belt. Refer toSection 1C, DOHC

Engine Mechanical.

3.  Remove the timing belt tension roller retaining bolt.
4.  Remove the timing belt tension roller.

5.  Remove the coolant pump mounting bolts.
6.  Remove the coolant pump from the engine block.
7.  Remove the ring seal from the coolant pump.

Inspection Cleaning Procedure

1.  Inspect the coolant pump body for cracks and

leaks.

2.  Inspect the coolant pump bearing for play or abnor-

mal noise.

3.  Inspect the coolant pump pulley for excessive wear.

If the coolant pump is defective, replace the coolant
pump as a unit.

4.  Clean the mating surfaces of the coolant pump and

the engine block.

ENGINE COOLING  1D – 11

DAEWOO V–121 BL4

Installation Procedure

1.  Install a new ring seal to the coolant pump.
2.  Coat the sealing surface of the ring seal with Lubri–

plate

±

.

3.  Install the coolant pump to the engine block with

the flange aligned with the recess of the rear timing
belt cover.

4.  Secure the coolant pump to the engine block with

the mounting bolts.

Tighten

Tighten the coolant pump mounting bolts (DOHC) to
20 N

S

m (15 lb–ft).

5.  Install the timing belt tension roller to the oil pump

with the flange inserted into the recess of the oil
pump.

6.  Install the timing belt tension roller bolt. Do not

tighten the bolt at this time.

7.  Install the timing belt. Refer toSection 1C, DOHC

En–gine Mechanical.

8.  Refill the engine cooling system. Refer to ”Draining

and Refilling the Cooling System”  in this section.

ELECTRIC COOLING FAN– MAIN OR
AUXILIARY

Removal Procedure

1.  Disconnect the negative battery cable.
2.  Disconnect the cooling fan electrical connector.
3.  Remove the fan shroud mounting bolts.
4.  Lift the fan shroud assembly upward, and remove

the fan shroud assembly from the vehicle.

1D – 12

I

ENGINE COOLING

DAEWOO V–121 BL4

5.  Remove the fan blade from the fan shroud assem-

bly by removing the nut at the center of the fan hub.

6.  Turn over the fan shroud assembly.

7.  Remove the fan motor retaining screws.
8.  Remove the fan motor from the shroud.

Installation Procedure

CAUTION : If a fan blade is bent or damaged in any
way, no attempt should be made to repair or reuse the
damaged part. A bent or damaged fan assembly must
be replaced with a new fan assembly. It is essential
that fan assemblies remain in proper balance. A fan
assembly that is not in proper balance can fail and fly
apart during use, creating extreme danger. Proper
balance cannot be assured on a fan assembly that
has been bent or damaged.

1.  Install the fan motor to the shroud.
2.  Secure the motor to the shroud with the retaining

screws.

Tighten

Tighten the fan motor retaining screws to 4 N

S

m (35

lb–in).

3.  Turn over the fan shroud assembly.

ENGINE COOLING  1D – 13

DAEWOO V–121 BL4

4.  Install the fan to the fan shroud assembly with the

single nut in the center of the fan hub.

Tighten

Tighten the fan motor nut to 3.2 N

S

m (28 lb–in).

5.  Install the fan shroud assembly to the radiator.

Important : Be careful to seat the mounting post on the
fan shroud into the socket at the radiator left tank. Be sure
to slip the tab at the bottom edge of the shroud into the re-
taining clip near the center of the radiator.

6.  Secure the shroud to the top of the radiator with the

mounting bolts.

Tighten

Tighten the fan assembly mounting bolts to 4 N

S

m (35

lb–in).

7.  Connect the cooling fan electrical connector.
8.  Connect the negative battery cable.

SURGE TANK

Removal Procedure

CAUTION : To prevent personal injury, do not remove
the surge tank cap while the engine and the radiator
are hot, because the heat causes the system to re-
main under pressure. Scalding fluid and steam may
be blown out under pressure.

1.  Drain the engine coolant to below the level of the

surge tank.

2.  Loosen the return hose clamp and disconnect the

return hose from the top of the surge tank.

3.  Loosen the throttle body hose clamp and discon-

nect the throttle body hose from the top of the
surge tank.

4.  Loosen the feed hose clamp and disconnect the

feed hose from the bottom of the surge tank.