radiator LEXUS GS400 2000 Service Owner's Guide

CO0AI±03
B02071
CO±30
± COOLING (2JZ±GE)ELECTRIC COOLING FAN
1568 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
INSTALLATION
1. INSTALL ELECTRIC COOLING FAN
(a) Install the electric cooling fan with the 6 bolts.
Torque: 5.0 N´m (50 kgf´cm, 44 in.´lbf)
(b) Connect the upper radiator hose to the radiator.
(c) Connect the ECM outlet duct to the ECM box.
(d) Connect the wire for electric cooling fan to clamp on the
electric cooling fan.
(e) Connect the 2 electric cooling fan connectors.
(f) Connect the radiator reservoir hose to the radiator.
2. INSTALL AIR CLEANER AND MAF METER AS-
SEMBLY
3. INSTALL AIR CLEANER INLET
4. FILL WITH ENGINE COOLANT
5. START ENGINE AND CHECK FOR COOLANT LEAKS

B01376
Radiator
Fan Main
RelayCO0AK±01
B00019
Ohmmeter
Continuity
OhmmeterOhmmeter
No Continuity
Continuity21
5
43
B00020
Ohmmeter Ohmmeter
No Continuity
Continuity 2
1
5
43
Battery
CO±32
± COOLING (2JZ±GE)RADIATOR FAN MAIN RELAY
1570 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
RADIATOR FAN MAIN RELAY
INSPECTION
1. REMOVE RELAY BOX COVER
2. REMOVE RADIATOR FAN MAIN RELAY (Marking:
RAD FAN MAIN)
3. INSPECT RADIATOR FAN MAIN RELAY
(a) Inspect the relay continuity.
(1) Using an ohmmeter, check that there is continuity
between terminals 3 and 5.
If there is no continuity, replace the relay.
(2) Check that there is continuity between terminals 2
and 4.
If there is no continuity, replace the relay.
(3) Check that there is no continuity between terminals
1 and 2.
If there is continuity, replace the relay.
(b) Inspect the relay operation.
(1) Apply battery positive voltage across terminals 3
and 5.
(2) Using an ohmmeter, check that there is no continu-
ity between terminals 2 and 4.
If there is continuity, replace the relay.
(3) Check that there is continuity between terminals 1
and 2.
If there is no continuity, replace the relay.
4. REINSTALL RADIATOR FAN MAIN RELAY
5. REINSTALL RELAY BOX COVER

CO09Z±03
A02725Turn
Loosen
B01614
Water Bypass Outlet
No.1 Water Bypass Hose
B01638
Clamp Bracket
Connector Bracket
B01572No.2 Water Bypass Pipe
± COOLING (2JZ±GE)WATER PUMP
CO±5
1543 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
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.

± COOLING (2JZ±GE)WATER PUMP
CO±9
1547 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
6. INSTALL RADIATOR ASSEMBLY
(See page CO±23)

EM0D5±03
A09758
Air Cleaner Inlet
Air Cleaner, MAF Meter and Intake
Air Resonator Assembly
PCV Hose
MAF Meter
Connector
PS Air Hose
Engine Wire
Clamp
EVAP HoseRadiator Assembly
Lower Radiator Hose
Upper Radiator Support
ECM
Outlet Duct
Wire Clamp
ECT Switch
Connector
Electric
Cooling Fan
Connector
Oil Cooler Hose
for A/T Accelerator Cable
PS Vane Pump
PS Pump
Front Bracket
Drive Belt
Engine Under Cover
N´m (kgf´cm, ft´lbf) : Specified torque
 Non±reusable Part
Lower Radiator
Support
Upper Radiator Hose
58 (590, 43)
52 (530, 38)
x 18
Engine Cover EM±14
± ENGINE MECHANICAL (2JZ±GE)TIMING BELT
1368 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
TIMING BELT
COMPONENTS

EM0D6±04
A01482
A02663
5 mm Hexagon Wrench
A02649
A02690
SST
EM±16
± ENGINE MECHANICAL (2JZ±GE)TIMING BELT
1370 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. REMOVE ENGINE UNDER COVER
2. DRAIN ENGINE COOLANT
3. REMOVE RADIATOR ASSEMBLY (See page CO±18)
4. REMOVE DRIVE BELT (See page CH±1)
5. REMOVE PS PUMP AND FRONT BRACKET
(a) Remove the 3 bolts, plate washer and pump front bracket.
(b) Disconnect the vane pump from the bracket.
6. REMOVE NO.3 TIMING BELT COVER
Using a 5 mm hexagon wrench, remove the 4 bolts, oil filler cap,
timing belt cover and gasket.
7. REMOVE NO.2 TIMING BELT COVER
Using a 5 mm hexagon wrench, remove the 3 bolts, timing belt
cover and gasket.
8. REMOVE DRIVE BELT TENSIONER
Remove the 3 bolts and tensioner.
NOTICE:
Be careful not to drop the bolts inside the timing belt cover.
9. LOOSEN CRANKSHAFT PULLEY BOLT
Using SST, loosen the pulley bolt.
SST 09213 ± 70010, 09330 ± 00021

A02803Plate Washer
A
B
A EM±28
± ENGINE MECHANICAL (2JZ±GE)TIMING BELT
1382 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
20. INSTALL NO.2 TIMING BELT COVER
(a) Install the gasket on the timing belt cover.
(b) Using a 5 mm hexagon wrench, install the timing belt cov-
er with the 3 bolts.
Torque: 8.0 N´m (80 kgf´cm, 71 in.´lbf)
21. INSTALL NO.3 TIMING BELT COVER
(a) Install the gasket on the timing belt cover.
(b) Using a 5 mm hexagon wrench, install the timing belt cov-
er with the 4 bolts.
Torque: 8.0 N´m (80 kgf´cm, 71 in.´lbf)
(c) Install the oil filler cap.
22. INSTALL PS PUMP AND FRONT BRACKET
(a) Temporarily install the vane pump to the bracket.
(b) Install the plate washer and front bracket with the 3 bolts.
Torque: 58 N´m (590 kgf´cm, 43 ft´lbf) for A bolts
52 N´m (530 kgf´cm, 38 ft´lbf) for B bolt
23. INSTALL DRIVE BELT (See page CH±1)
24. INSTALL RADIATOR ASSEMBLY (See page CO±23)
25. FILL ENGINE WITH COOLANT
26. START ENGINE CHECK FOR LEAKS
27. INSTALL ENGINE UNDER COVER
28. ROAD TEST
Check for abnormal noise, shock, slippage, correct shift points
and smooth operation.
29. RECHECK ENGINE COOLANT LEVEL

EM0D9±04
A09751
Air Cleaner,
MAF Meter
and Intake Air
Resonator
Assembly
PCV HoseExhaust Manifold
Case Clamp
PS Air
Hose
EVAP Hose
Air Cleaner InletMAF Meter
Connector
Heated Oxygen Sensor
Connector
 Clamp
40 (408, 32)
x 8
 Gasket
44 (440, 32)
44 (440, 32)
Pipe Support Bracket
Accelerator Cable
 Gasket
Upper Radiator
Hose
Front Exhaust Pipe
Drive Belt
Engine Under Cover
x 18
N´m (kgf´cm, ft´lbf) : Specified torque
 Non±reusable Part
Engine Cover
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
EM±29
1383 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
CYLINDER HEAD
COMPONENTS

EM0DA±03
A02823
A02802
B01935
Wire
Grommet
Clamp
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
EM±33
1387 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. REMOVE ENGINE UNDER COVER
2. DRAIN ENGINE COOLANT
3. DISCONNECT UPPER RADIATOR HOSE FROM WA-
TER OUTLET
4. REMOVE ENGINE COVER
Remove the 4 nuts and engine cover.
5. REMOVE AIR CLEANER INLET
6. REMOVE AIR CLEANER, MAF METER AND INTAKE
AIR RESONATOR ASSEMBLY (See page EM±62)
7. REMOVE DRIVE BELT (See page CH±1)
8. DISCONNECT PS PUMP WITHOUT DISCONNECTING
HOSES
(a) Disconnect the PS air hose from the No.4 timing belt cov-
er.
(b) Disconnect the PS air hose from the air intake chamber.
(c) Remove the 2 bolts and pump rear stay.
(d) Remove the 2 bolts, and disconnect the vane pump from
the pump bracket.
HINT:
Put aside the vane pump, and suspend it.
9. DISCONNECT FRONT EXHAUST PIPE FROM EX-
HAUST MANIFOLD
(a) Disconnect the wire grommet and sensor wire of the
heated oxygen sensor (bank 2 sensor 2) from the hole
and clamp on the floor.

B01935
Wire
Grommet
Clamp
A02802
EM±58
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
1412 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
Torque: 44 N´m (440 kgf´cm, 32 ft´lbf)
(d) Connect the wire grommet and sensor wire of the the
heated oxygen sensor (bank 2 sensor 2) to the hole and
clamp on the floor.
23. INSTALL PS PUMP
(a) Install the vane pump with the 2 bolts.
Torque: 58 N´m (590 kgf´cm, 43 ft´lbf)
(b) Install the pump rear stay with the 2 bolts.
Torque: 39.2 N´m (400 kgf´cm, 29 ft´lbf)
(c) Connect the PS air hose to the No.4 timing belt cover.
(d) Connect the PS air hose to the air intake chamber.
24. INSTALL DRIVE BELT (See page CH±1)
25. INSTALL AIR CLEANER, MAF METER AND INTAKE
AIR RESONATOR ASSEMBLY (See page EM±68)
26. INSTALL AIR CLEANER INLET
27. CONNECT UPPER RADIATOR HOSE TO WATER OUT-
LET
28. INSTALL ENGINE COVER
Install the engine cover with the 4 nuts.
29. FILL WITH ENGINE COOLANT
30. START ENGINE AND CHECK FOR LEAKS
31. INSTALL ENGINE UNDER COVER
32. ROAD TEST
Check for abnormal noise, shock, slippage, correct shift points
and smooth operation.
33. RECHECK ENGINE COOLANT LEVEL