timing LEXUS GS400 2000 Service Owner's Manual

A02726
Seal WasherSet BoltHold
Straight
Screw
Plug
A02722
Mesh Part
Frame Part
A11126
5 mm
Hexagon
Wrench
A02661
Front MarkSST
± ENGINE MECHANICAL (2JZ±GE)TIMING BELT
EM±25
1379 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(c) Holding the hexagon portion of the camshaft with a
wrench.
(d) Using a 10 mm hexagon wrench, and the set bolt.
Torque: 81 N´m (810 kgf´cm, 60 ft´lbf)
(e) Using a 14 mm hexagon wrench, install the straight screw
plug with the seal washer to the set bolt.
Torque: 15 N´m (150 kgf´cm, 11 ft´lbf)
(f) Align the dot mark on the camshaft timing pulley with the
timing mark of the No.4 timing belt cover.
(g) Remove the wrench.
8. CONNECT NO.1 OIL PIPE
(a) Install the union bolt to the oil control valve filter.
NOTICE:
In case of touching the filter, avoid holding the mesh part
and holding the frame part.
(b) Install the oil pipe with 2 new gasket and the union bolt to
the No.3 camshaft bearing cap.
Torque: 55 N´m (550 kgf´cm, 41 ft´lbf)
9. INSTALL CAMSHAFT TIMING OIL CONTROL VALVE
(See page SF±43)
10. INSTALL NO.1 CYLINDER HEAD COVER
(a) Install the cylinder head and gasket with the 6 bolts and
2 nuts.
Torque: 8.5 N´m (85 kgf´cm, 75 in.´lbf)
(b) Install the high±tension cords and clamps with the 2 bolts.
Torque: 8.0 N´m (80 kgf´cm, 71 in.´lbf)
(c) Using a 5 mm hexagon wrench, install the engine wire
protector with the bolt and nut.
11. INSTALL THROTTLE BODY AND INTAKE AIR
CONNECTOR ASSEMBLY (See page EM±5)
12. INSTALL ENGINE COVER
Install the engine cover with the 4 nuts.
13. INSTALL EXHAUST CAMSHAFT TIMING PULLEY
(a) Align the camshaft knock pin with the groove on the
pulley, and slide on the timing pulley.
(b) Slide the timing pulley on the camshaft, facing the front
mark forward.
(c) Using SST, install the pulley bolt.
SST 09960±10010 (09962±01000, 09963±01000)
Torque: 81 N´m (810 kgf´cm, 60 ft´lbf)

A02821
AlignSST
Turn
A02653
A02654
Z02446
1.5 mm
Hexagon
Wrench
P04459
EM±26
± ENGINE MECHANICAL (2JZ±GE)TIMING BELT
1380 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(d) Using SST, align the dot mark on the camshaft timing tim-
ing pulley with the timing mark of the No.4 timing belt cov-
er.
SST 09960±10010 (09962±01000, 09963±01000)
14. CONNECT TIMING BELT TO CAMSHAFT TIMING
PULLEYS
HINT:
When re±using timing belt:

Check that the matchmark on the timing belt matches the
end of the No.1 timing belt cover.
If the matchmark does not align, shift the meshing of the
timing belt and crankshaft timing pulley until they align.

Align the matchmarks of the timing belt and camshaft tim-
ing pulleys.
(a) Remove any oil or water on the camshaft timing pulley,
and keep it clean.
(b) Install the timing belt, checking the tension between the
crankshaft timing pulley and intake camshaft timing
pulley.
15. SET TIMING BELT TENSIONER
(a) Using a press, slowly press in the push rod using 981 ±
9,807 N (100 ± 1,000 kgf, 220 ± 2,205 lbf) of force.
(b) Align the holes of the push rod and housing, pass a 1.5
mm hexagon wrench through the holes to keep the push
rod retracted.
(c) Release the press.
(d) Install the dust boot onto the tensioner.

P10918
A02646
A02645
Turn
A02656
A02691
SST
± ENGINE MECHANICAL (2JZ±GE)TIMING BELT
EM±27
1381 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
16. INSTALL TIMING BELT TENSIONER
(a) Temporarily install the tensioner with the 2 bolts.
(b) Alternately tighten the 2 bolts.
Torque: 27 N´m (270 kgf´cm, 20 ft´lbf)
(c) Remove the 1.5 mm hexagon wrench from the tensioner
with pliers.
17. CHECK VALVE TIMING
(a) Slowly turn the crankshaft pulley 2 revolutions from TDC
to TDC.
NOTICE:
Always turn the crankshaft clockwise.
(b) Check that each pulley aligns with the timing marks as
shown in the illustration.
If the marks do not align, remove the timing belt and reinstall it.
18. TIGHTEN CRANKSHAFT PULLEY BOLT
Using SST, install the pulley bolt.
SST 09213±70010, 09330±00021
Torque: 330 N´m (3,300 kgf´cm, 243 ft´lbf)
19. INSTALL DRIVE BELT TENSIONER
Install the tensioner with the 3 bolts.
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)
NOTICE:
Be careful not to drop the bolts inside the timing belt cover.

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

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)

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)

A11122
A02713
A02836
S03013
A02647
EM±36
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
1390 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
22. REMOVE INTAKE MANIFOLD ASSEMBLY
(a) Disconnect the starter wire from the manifold stay.
(b) Remove the 2 bolts and manifold stay.
(c) Remove the 7 bolts, 2 nuts, intake manifold and delivery
pipe assembly and gasket.
23. REMOVE NO.1 AND NO.2 CYLINDER HEAD COVERS
(a) Remove the 12 bolts and 4 nuts.
(b) Remove the cylinder head covers and gaskets.
24. DISCONNECT TIMING BELT FROM CAMSHAFT TIM-
ING PULLEYS (See page EM±16)
NOTICE:

Support the timing belt, so that the measuring of the
crankshaft timing pulley and timing belt does not
shift.

Be careful not to drop anything inside the timing belt
cover.

Do not allow the timing belt to come into contact with
oil, water or dust.
25. REMOVE CAMSHAFT TIMING PULLEYS
(a) Remove the exhaust camshaft timing pulley.
Hold the hexagon portion of the camshaft with a wrench, and
remove the pulley bolt and camshaft pulley.
(b) Remove the VVT±i (intake camshaft timing) pulley.
(See page EM±16)
26. REMOVE NO.4 TIMING BELT COVER
Remove the 4 bolts and timing belt cover.