Nissan Quest E52. Manual - part 287

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COOLING FAN

CAUTION:

Be careful not to damage or scratch on radiator core.

INSTALLATION

Note the following, and install in the reverse order of removal.

CAUTION:

Only use genuine parts for cooling fan mounting bolt and observe the specified torque (to prevent
radiator from being damaged).
NOTE:
Cooling fans are controlled by ECM. For details, refer to 

EC-45, "COOLING FAN CONTROL : System

Description"

.

Disassembly and Assembly

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DISASSEMBLY

1.

Remove cooling fan mounting nuts, and then remove the cooling fans (RH and LH).

2.

Remove fan motors (RH and LH).

ASSEMBLY

Note the following, and assemble in the reverse order of disassembly.

CAUTION:

RH and LH cooling fans are different. Be careful not to misassemble them.
• Install each fan in the following position.

• Secure the harness tightly to the fan shroud to prevent the fan rotation area from being loose.

Inspection

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INSPECTION AFTER DISASSEMBLY

Cooling Fan

Inspect cooling fan for crack or unusual bend.
• If anything is found, replace cooling fan.

Right side

: 11 blades

Left side

: 9 blades

WATER PUMP

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WATER PUMP

Exploded View

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Removal and Installation

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CAUTION:

• When removing water pump assembly, be careful not to get engine coolant on drive belt.
• Water pump cannot be disassembled and should be replaced as a unit.
• After installing water pump, connect hose and clamp securely, then check for leakage using the radi-

ator cap tester (commercial service tool) and the radiator cap tester adapter (commercial service
tool).

REMOVAL

1.

Remove the following parts.
• Cowl top extension.
• Engine under cover
• Front road wheel and tire
• Splash guard (RH): Refer to 

EXT-23, "Exploded View"

.

2.

Drain engine coolant from radiator. Refer to 

CO-8, "Draining"

.

CAUTION:

• Perform this step when the engine is cold.
• Never spill engine coolant on drive belt.

3.

Remove drive belt. Refer to 

EM-25, "Removal and Installation"

.

4.

Remove idler pulleys and harness bracket. Refer to 

EM-25, "Removal and Installation"

.

1.

Timing chain tensioner (primary)

2.

Valve timing control cover gasket 
(bank 1)

3.

Valve timing control cover (bank 1)

4.

Water drain plug (front)

5.

Water pump cover

6.

O-ring

7.

O-ring

8.

Water pump

A.

Apply engine coolant

B.

Identify with white mark

 : Always replace after every disassembly.

 : N·m (kg-m, ft-lb)

 : N·m (kg-m, in-lb)

 : Should be lubricated with oil.

 : Sealing point

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WATER PUMP

5.

Remove torque rod (upper). Refer to 

EM-56, "Removal and Installation"

.

6.

Remove water drain plug (front) on water pump side of cylinder block to drain engine coolant from engine
inside.

7.

Remove valve timing control cover (bank 1) and water pump cover from front timing chain case.
• Use the seal cutter [SST: KV10111100 (J-37228)] to cut liquid gasket for removal.

8.

Remove timing chain tensioner (primary) (1) as follows:

a.

Remove lower mounting bolt (A).

CAUTION:

Be careful not to drop mounting bolt inside timing chain
case.

b.

Loosen upper mounting bolt (B) slowly, and then turn chain ten-
sioner (primary) on the mounting bolt so that plunger (C) is fully
expanded.
NOTE:
Even if plunger is fully expanded, it is not dropped from the body
of timing chain tensioner (primary).

c.

Remove timing chain tensioner (primary). Refer to 

EM-67, "Removal and Installation"

.

d.

Turn crankshaft pulley clockwise so that timing chain on the tim-
ing chain tensioner (primary) side is loose.

9.

Remove water pump as follows:
NOTE:
The use of the following item simplifies the procedure.
• Thin plastic sheet cut as shown in the figure.

a.

Remove three water pump mounting bolts.

b.

Turn the crankshaft pulley counterclockwise to slack the water pump side timing chain for allowance.
• With the timing chain around water pump sprocket held with fingers, turn crank pulley counterclockwise

to the position where the timing chain cannot be pulled in cylinder head direction.

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: Crankshaft pulley

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a

:60 mm (2.36 in)

b

:140 mm (5.51 in)

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WATER PUMP

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c.

Insert sheet (A) between timing chain and water pump sprocket
(1) of water pump housing.

d.

Screw bolts (B) of size M8 x 1.25 (threads length: approx. 50
mm) into the upper and lower bolt holes used for mounting water
pump and tighten the bolts alternately by half turn all the way to
pull out water pump (1).

• Pull out water pump straight to protect the mounting part from

damage caused by vane.

• Do not allow sprocket to interfere with timing chain.

10. Remove M8 bolt and two O-rings from water pump.

INSTALLATION

CAUTION:

Do not reuse O-rings.

1.

Install new O-rings to water pump.

CAUTION:

Do not reuse O-rings.
• Clean mounting grooves of O-ring to remove foreign matter.
• Install O-ring with a white identification mark to the engine front side (sprocket side) and O-ring with no

identification mark to the engine rear side (vane side).

CAUTION:

Each O-ring is made of different material. Always install appropriate O-ring to the correct posi-
tion.

2.

Install water pump.

a.

Insert water pump by widening timing chain (1) with sheet (A) so
as not to allow O-ring to interfere with timing chain and the cor-
ner of cylinder block.
• Apply engine oil around the O-ring with a white identification

mark.

• Apply LLC around the O-ring with no identification mark.
• Insert water pump direct to cylinder block.
• Do not allow O-ring to be displaced.
• Press into water pump by tightening the mounting bolts alter-

nately and evenly.

• Check timing chain and water pump sprocket for proper

engagement.

3.

Install timing chain tensioner (primary) as follows:

a.

Completely remove dust and foreign matter from the back of chain tensioner (primary) and the mounting
surface on the rear timing chain case.

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:Sheet

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