Lexus GS300/400 (2000 year). Service manual - part 124

CO09Z–03

A02725

Turn

Loosen

B01614

Water Bypass Outlet

No.1 Water Bypass Hose

B01638

Clamp Bracket

Connector Bracket

B01572

No.2 Water Bypass Pipe

–

COOLING (2JZ–GE)

WATER PUMP

CO–5

1543

REMOVAL

1.

REMOVE RADIATOR ASSEMBLY
(See page 

CO–18

)

2.

REMOVE DRIVE BELT AND WATER PUMP PULLEY

(a)

Loosen the 4 nuts holding the water pump pulley to the
water pump.

(b)

Loosen the drive belt tension by turning the drive belt ten-
sioner clockwise, and remove the drive belt.

(c)

Remove the 4 nuts and water pump pulley.

3.

REMOVE TIMING BELT AND IDLER PULLEY
(See page 

EM–16

)

4.

REMOVE WATER BYPASS OUTLET AND NO.1
WATER BYPASS PIPE

(a)

Remove the 2 bolts, water bypass outlet and No.1 water
bypass pipe.

(b)

Remove the 3 O–rings from the water bypass outlet and
No.1 water bypass pipe.

5.

REMOVE WATER INLET AND THERMOSTAT
(See page 

CO–11

)

6.

REMOVE WATER PUMP

(a)

Loosen the nut and remove the bolt, slide the generator
away from the water pump.

(b)

Remove the bolt, and disconnect the clamp bracket (for
engine wire).

(c)

Remove the bolt, and disconnect the connector bracket
(for crankshaft position sensor connector).

(d)

Remove the 2 nuts, and disconnect the No.2 water by-
pass pipe from the water pump.

B01941

Drain Hose

CO–6

–

COOLING (2JZ–GE)

WATER PUMP

1544

(e)

Remove the 6 bolts, water pump and gasket.

(f)

Remove the drain hose.

(g)

Remove the O–ring from the cylinder block.

CO0A0–01

B01574

–

COOLING (2JZ–GE)

WATER PUMP

CO–7

1545

INSPECTION

INSPECT WATER PUMP
Turn the pulley seat, and check that the water pump bearing is
not rough or noisy.
If necessary, replace the water pump.

CO0A1–03

P03945

New
O–Ring

P02574

New Gasket

A02801

A

B

A

B

A

B

B

B

B01614

New O–Ring

CO–8

–

COOLING (2JZ–GE)

WATER PUMP

1546

INSTALLATION

1.

INSTALL WATER PUMP

(a)

Install a new O–ring to the cylinder block.

(b)

Install the drain hose.

(c)

Install a new gasket to the water pump.

(d)

Connect the water pump to the water bypass pipe. Do not
install the nut yet.

(e)

Install the water pump with the 2 bolts (A) and 4 bolts (B).
Torque: 21 N·m (210 kgf·cm, 15 ft·lbf)

HINT:
Hand tighten the (A) bolts first.
(f)

Install the 2 nuts holding the No.2 water bypass pipe to
the water pump.
Torque: 21 N·m (210 kgf·cm, 15 ft·lbf)

(g)

Install the connector bracket (for crankshaft position sen-
sor connector) with the bolt.

(h)

Install the clamp bracket (for engine wire) with the bolt.

(i)

Install the generator with the bolt and nut.
Torque: 40 N·m (400 kgf·cm, 30 ft·lbf)

2.

INSTALL THERMOSTAT AND WATER INLET
(See page 

CO–13

)

3.

INSTALL NO.1 WATER BYPASS PIPE AND WATER
BYPASS OUTLET

(a)

Install 2 new O–rings to the No.1 water bypass pipe.

(b)

Install a new O–ring and the water bypass outlet with the
2 bolts.
Torque: 9.0 N·m (90 kgf·cm, 80 in.·lbf)

4.

INSTALL IDLER PULLEY AND TIMING BELT
(See page 

EM–23

)

5.

INSTALL WATER PUMP PULLEY AND DRIVE BELT
Torque: 14 N·m (140 kgf·cm, 10 ft·lbf)