LEXUS GS400 2000 Service Repair Manual

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

A11125
Throttle Body and Intake Air Connector AssemblyWater Bypass Hose
PCV Hose
EVAP Hose
 Gasket
Air Assist Hose
Vacuum
Hose
PS Air Hose
Air Intake Chamber
Engine Wire
Clamp
Drive Belt
TensionerClamp Bracket
Ground StrapFuel Pressure
Pulsation Damper Clamp Bracket
Water Bypass
Outlet
No.1 Water Bypass Pipe
No.3 Timing Belt Cover O±Ring
Oil Filler CapFuel Inlet Pipe
PS Air Hose
Hose
Clamp
Timing Belt
Tensioner
PS Pump Stay
Oil Dipstick
and Guide
for A/T
PS Vane Pump Water Bypass Hose
28 (280, 21)
Engine Wire
 O±Ring
No.2 Timing Belt Cover
GasketGasket
21 (210, 15)
32.5 (325, 24)
 Gasket
 Gasket
Engine Wire
Clamp
 O±Ring  O±RingOil Dipstick and
Guide for Engine
27 (270, 20)
58 (590, 43)39.2 (400, 29)N´m (kgf´cm, ft´lbf) : Specified torque
 Non±reusable Part
Dust BootEngine Wire
Clamp
No.2 Vacuum Pipe
Hose Clamp
Vacuum Control
Valve Set
EM±30
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
1384 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

A11124
Ignition Coils and
High±Tension Cord
Assembly
GasketNo.2 Cylinder Head Cover
Camshaft Timing Oil Control ValveExhaust Camshaft
No.1 Camshaft Bearing Cap
Gasket
No.1 Cylinder Head Cover
No.2 Camshaft Bearing Cap x 6
x 24 x 6
20 (200, 15)
20 (200, 15)
Intake Camshaft
 O±Ring
 GasketOil Control Valve Filter
x 14 No.3 Camshaft Bearing Cap
No.1 Oil Pipe
See page EM±52
1st 35 (350, 25)
2nd Turn 90°
3rd Turn 90°
Heater Hose
55 (550, 41)
Union Bolt
18 (180, 13)Spark Plug
 Oil Seal
No.4 Timing Belt Cover
Camshaft Timing Pulley
Cylinder Head Assembly
Intake Manifold Assembly
Manifold Stay
 Cylinder Head Gasket
 Gasket
x 7
81 (810, 60)
15 (150, 11)
8.0 (80, 71 in.´lbf)
N´m (kgf´cm, ft´lbf) : Specified torque
 Non±reusable partx 12
28 (280, 21)
Starter Wire
Straight
Screw Plug
Timing Belt
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
EM±31
1385 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

A02822
 Oil Seal
 Non±reusable part

Precoated part


 Gasket Gasket
ECT Sensor
 Valve Guide Bushing
Valve
Water Outlet with Water Bypass Hose
Camshaft Position SensorEngine Hanger Heater Union
Cylinder HeadSpring Seat Valve Spring Spring RetainerKeeper
Adjusting Shim
Valve Lifter
EM±32
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
1386 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)

EM0D1±05
A11132
Compression Tester
± ENGINE MECHANICAL (2JZ±GE)COMPRESSION
EM±3
1357 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COMPRESSION
INSPECTION
HINT:
If there is lack of power, excessive oil consumption or poor fuel
economy, measure the compression pressure.
1. WARM UP AND STOP ENGINE
Allow the engine to warm up to normal operating temperature.
2. REMOVE ENGINE COVER
Remove the 4 nuts and engine cover.
3. DISCONNECT IGNITION COILS AND HIGH±TENSION
CORD SET ASSEMBLY (See page IG±7)
4. REMOVE SPARK PLUGS
5. DISCONNECT INJECTOR CONNECTORS
6. CHECK CYLINDER COMPRESSION
(a) Insert a compression tester into the spark plug hole.
(b) While cranking the engine, measure the compression
pressure.
HINT:
Always use a fully charged battery to obtain engine revolutions
of 250 rpm or more.
(c) Repeat steps (a) through (b) for each cylinder.
NOTICE:
This measurement must be done in as short a time as pos-
sible.
Compression:
1,324 kPa (13.5 kgf/cm
2, 192 psi) or more
Minimum pressure:
1,079 kPa (11.0 kgf/cm
2, 156 psi)
Difference between each cylinder:
98 kPa (1.0 kgf/cm
2, 14 psi) or less
(d) If the cylinder compression in 1 or more cylinders is low,
pour a small amount of engine oil into the cylinder through
the spark plug hole and repeat steps (a) through (b) for
the cylinder with low compression.

If adding oil helps the compression, it is likely that
the piston rings and/or cylinder bore are probably
worn or damaged.

If pressure stays low, a valve may be sticking or
seating improper, or there may be leakage past the
gasket.

EM±4
± ENGINE MECHANICAL (2JZ±GE)COMPRESSION
1358 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
7. RECONNECT INJECTOR CONNECTORS
HINT:
The Nos.1, 3, 5 injector connectors and dark gray, and the
Nos.2, 4, 6 injector connectors are brown.
8. REINSTALL SPARK PLUGS
9. RECONNECT IGNITION COILS AND HIGH±TENSION
CORD SET ASSEMBLY (See page IG±9)
10. INSTALL ENGINE COVER
Install the engine cover with the 4 nuts.

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.

A02819
A09752
A02735
EM±34
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
1388 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Remove the 3 bolts and nuts holding the front exhaust
pipe to the exhaust manifold.
(c) Remove the 2 bolts and pipe support bracket.
(d) Disconnect the front exhaust pipe from the exhaust man-
ifold, and remove the 2 gaskets.
10. REMOVE EXHAUST MANIFOLD
(a) Disconnect the 3 heated oxygen sensor connectors and
clamp.
(b) Remove the clamp and case clamp.
(c) Using a 14 mm deep socket wrench, remove the 8 nuts,
exhaust manifold and 2 gaskets.
11. REMOVE WATER BYPASS OUTLET AND NO.1
WATER BYPASS PIPE (See page CO±11)
12. REMOVE THROTTLE BODY AND INTAKE AIR
CONNECTOR ASSEMBLY (See page EM±5)
13. REMOVE OIL DIPSTICK AND GUIDE FOR ENGINE
(See page LU±6)
14. REMOVE OIL DIPSTICK AND GUIDE FOR A/T
(See page EM±62)
15. REMOVE AIR INTAKE CHAMBER (See page SF±46)
16. REMOVE VACUUM CONTROL VALVE SET AND NO.2
VACUUM PIPE
(a) Disconnect the VSV connector for the ACIS.
(b) Remove the 3 nuts, vacuum control valve set and No.2
vacuum pipe.
(c) Disconnect the engine wire clamp from the clamp bracket
of the No.2 vacuum pipe.
17. REMOVE NO.3 TIMING BELT COVER
18. REMOVE IGNITION COILS AND HIGH±TENSION
CORD SET ASSEMBLY (See page IG±7)
19. REMOVE SPARK PLUGS

A02732
(a)
(b) (c)
(d)(d)
(c) (b)
A02811
A02733
Clamp Bracket
A11123
5 mm
Hexagon
Wrench
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
EM±35
1389 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
20. DISCONNECT ENGINE WIRE FROM CYLINDER HEAD
(a) Disconnect the ground strap from the cylinder head.
(b) Disconnect the 2 water bypass hoses from the hose
clamps on the cylinder head and oil filter bracket.
(c) Remove the 2 bolts and hose clamps.
(d) Disconnect the heated oxygen sensor (bank 2 sensor 1)
connector and engine wire clamp from the hose clamps.
(e) Disconnect the heated oxygen sensor (bank 1 sensor 1)
connector.
(f) Disconnect the crankshaft position sensor connector.
(g) Disconnect the generator connector.
(h) Remove the bolt and clamp bracket, and disconnect the
engine wire from the water pump.
(i) Disconnect the 2 ground terminals from the intake man-
ifold.
(j) Disconnect the 2 engine wire clamps from the No.1 oil
pipe and clamp bracket on the intake manifold.
(k) Remove the bolt and clamp bracket.
(l) Disconnect the ECT sensor connector.
(m) Remove the 2 knock sensor connectors.
(n) Remove the oil pressure switch connector.
(o) Remove the oil level sensor connector.
(p) Remove the starter connector.
(q) Remove the 6 injector connectors.
(r) Remove the camshaft timing oil control valve connector.
(s) Remove the camshaft position sensor connector.
(t) Using a 5 mm hexagon wrench, remove the bolt holding
the engine wire protector to the No.2 cylinder head cover.
(u) Remove the 3 nuts, and disconnect the engine wire pro-
tector from the intake manifold.
21. REMOVE FUEL PRESSURE PULSATION DAMPER
(See page SF±26)