timing belt LEXUS GS400 2000 Service Owner's Manual

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

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.

A02638
A02651
A02664
EX
IN135
24
135
24 1 1
EM±6
± ENGINE MECHANICAL (2JZ±GE)VALVE CLEARANCE
1360 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
5. REMOVE NO.3 TIMING BELT COVER
Using a 5 mm hexagon wrench, remove the 4 bolts, oil filler cap,
timing belt cover and gasket.
6. REMOVE IGNITION COILS AND HIGH±TENSION
CORD SET ASSEMBLY (See page IG±7)
7. REMOVE SPARK PLUGS
8. DISCONNECT ENGINE WIRE FROM CYLINDER HEAD
COVERS
9. REMOVE CYLINDER HEAD COVERS
(See page EM±33)
10. SET NO.1 CYLINDER TO TDC/COMPRESSION
(a) Turn the crankshaft pulley and align its groove with the
timing mark º0º of the No.1 timing belt cover.
NOTICE:
Always turn the crankshaft clockwise.
(b) Check that the timing marks of the camshaft timing pul-
leys are aligned with the timing marks of the No.4 timing
belt cover.
If not, turn the crankshaft 1 revolution (360°).
11. INSPECT VALVE CLEARANCE
(a) Check only those valves indicated in the illustration.

Using a feeler gauge, measure the clearance be-
tween the valve lifter and camshaft.

Record the valve clearance measurements of those
that are out of specification. They will be used later
to determine the required replacement adjusting
shim.
Valve clearance (Cold):
Intake0.15 ± 0.25 mm(0.006 ± 0.010 in.)
Exhaust0.25 ± 0.35 mm (0.010 ± 0.014 in.)
(b) Turn the crankshaft pulley 1 revolution (360°), and align
the groove with the timing mark º0º of the No.1 timing belt
cover.

± ENGINE MECHANICAL (2JZ±GE)VALVE CLEARANCE
EM±9
1363 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
15. REINSTALL SPARK PLUGS
16. REINSTALL IGNITION COILS AND HIGH±TENSION
CORD SET ASSEMBLY (See page IG±9)
17. REINSTALL NO.3 TIMING BELT COVER
(a) Install the gasket to 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.
18. REINSTALL THROTTLE BODY AND INTAKE AIR CON-
NECTOR ASSEMBLY
(a) Install a new gasket to the air intake chamber.
(b) Place the throttle body together with the intake air con-
nector on the cylinder head.
(c) Connect the vacuum hose (from actuator for ACIS) to the
No.1 vacuum pipe.
(d) Connect the 2 water bypass hoses to the throttle body.
(e) Install the 4 bolts and 2 nuts holding the intake air connec-
tor to the air intake chamber.
Torque: 28 N´m (280 kgf´cm, 21 ft´lbf)
(f) Install the 2 nuts holding the throttle body bracket to the
cylinder head.
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)
(g) Connect the air assist hose to the intake air connector.
(h) Install the PCV hose to the intake air connector.
(i) Install the EVAP hose (from charcoal canister) to the VSV
for EVAP.
(j) Install the vacuum hose (from No.2 vacuum pipe) to the
No.1 vacuum pipe.
(k) Install the throttle position sensor connector.
(l) Install the accelerator pedal position sensor connector.
(m) Install the throttle control motor connector.
(n) Install the VSV connector for EVAP.
(o) Secure the engine wire with the clamp on the throttle body
bracket.
(p) Install the engine wire clamp with the clamp bracket of the
throttle body.
(q) Connect the accelerator cable to the throttle body.
19. REINSTALL INTAKE AIR RESONATOR
20. REINSTALL ENGINE COVER
Install the engine cover with the 4 nuts.
21. REFILL WITH ENGINE COOLANT
22. START ENGINE AND CHECK FOR LEAKS

S02644SST
B02434
B02435
120°120°
B02436
120°120°
A02727
Front Mark
EM±54
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
1408 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(n) Using SST, push the 2 oil seals in as far as they can go.
SST 09316±60011 (09316±00011, 09316±00051)
(o) Rotate the camshaft with a wrench at the hexagon posi-
tion, bring the forward straight pin up.
(p) Loosen the 12 bearing cap bolts as shown, until they can
be turned by hand; retighten in several passes.
Torque: 20 N´m (200 kgf´cm, 15 ft´lbf)
(q) Turn the camshaft 1/3 of a revolution.
(r) Loosen the 8 bearing cap bolts as shown, until they can
be turned by hand; retighten in several passes.
Torque: 20 N´m (200 kgf´cm, 15 ft´lbf)
(s) Turn the camshaft a further 1/3 of a revolution.
(t) Loosen the 8 bearing cap bolts as shown, until they can
be turned by hand; retighten in several passes.
Torque: 20 N´m (200 kgf´cm, 15 ft´lbf)
4. CHECK AND ADJUST VALVE CLEARANCE
(See page EM±5)
5. INSTALL NO.4 TIMING BELT COVER
Install the timing belt cover with 4 bolts.
Torque: 8.0 N´m (80 kgf´cm, 71 in.´lbf)
6. INSTALL CAMSHAFT TIMING PULLEYS
(a) Install the exhaust camshaft timing pulley.
(1) Align the camshaft knock pin with the groove in the
pulley, and slide on the pulley.
(2) Slide the timing pulley on the camshaft, facing the
front mark forward.
(3) Hold the hexagon portion of the camshaft with a
wrench, and tighten the timing pulley bolt.
Torque: 81 N´m (810 kgf´cm, 60 ft´lbf)

A02698
Seal Packing
A11122
A11123
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
EM±55
1409 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Install the VV±i (intake camshaft timing) pulley.
(See page EM±23)
7. CONNECT TIMING BELT TO CAMSHAFT TIMING
PULLEYS (See page EM±23)
8. INSTALL NO.1 AND NO.2 CYLINDER HEAD COVERS
(a) Remove the any old packing (FIPG) material.
(b) Apply seal packing to the cylinder head as shown in the
illustration.
Seal packing: Part No. 08826±00080 or equivalent
(c) Install the gaskets to the cylinder head covers.
(d) Install the cylinder head covers with the 12 bolts and 4
nuts.
Torque: 8.5 N´m (85 kgf´cm, 75 in.´lbf)
9. INSTALL INTAKE MANIFOLD ASSEMBLY
(a) Install a new gasket and the intake manifold and delivery
pipe assembly with the 7 bolts and 2 nuts.
Torque: 28 N´m (280 kgf´cm, 21 ft´lbf)
(b) Pass the water bypass hose between the No.2, No.3 in-
take ports of the manifold and delivery pipe.
(c) Install the manifold stay with the 2 bolts.
Torque: 40 N´m (400 kgf´cm, 30 ft´lbf)
(d) Install the starter wire to the manifold stay.
10. INSTALL FUEL PRESSURE PULSATION DAMPER
(See page SF±27)
11. CONNECT ENGINE WIRE TO CYLINDER HEAD
(a) Install the engine wire protector with the 3 nuts.
(b) Using a 5 mm hexagon wrench, install the bolt holding the
engine wire protector to the No.2 cylinder head cover.
(c) Connect the 6 injector connectors.
HINT:
The Nos.1, 3, 5 injector connectors and dark gray, and the
Nos.2, 4, 6 injector connectors are brown.
(d) Connect the camshaft timing oil control valve connector.
(e) Connect the camshaft position sensor connector.
(f) Connect the ECT sensor connector.

A02733
Clamp Bracket
A02811
A02732
(v)(s)(t)
(u)(u)
(t)
(s) EM±56
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
1410 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(g) Connect the 2 knock sensor connector.
(h) Connect the starter connector.
(i) Connect the oil pressure switch connector.
(j) Connect the oil level sensor connector.
(k) Install the clamp bracket to the intake manifold.
(l) Connect the 2 wire clamps to the No.1 oil pipe and clamp
bracket on the intake manifold.
(m) Install the 2 ground terminals to the intake manifold.
Tighten so that each calking part should face inside.
(n) Install the clamp bracket to the water pump.
(o) Connect the generator connector.
(p) Connect the crankshaft position sensor connector.
(q) Connect the heated oxygen sensor (bank 1 sensor 1)
connector.
(r) Secure the engine wire with the clamp.
(s) Install the 2 hose clamps to the cylinder head and oil filter
bracket.
(t) Install the heated oxygen sensor (bank 2 sensor 1) con-
nector and engine wire clamp to the hose clamps.
(u) Install the 2 water bypass hoses to the hose clamps on
the cylinder head and oil filter bracket.
(v) Install the ground strap to the cylinder head.
12. INSTALL SPARK PLUGS
13. INSTALL IGNITION COILS AND HIGH±TENSION
CORD SET ASSEMBLY (See page IG±9)
14. INSTALL NO.3 TIMING BELT COVER
Torque: 8.0 N´m (80 kgf´cm, 71 in.´lbf)

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

EM0DH±05
A02753
EVAP
Hose
Clamp
MAF Meter
Connector
A02751
EM±62
± ENGINE MECHANICAL (2JZ±GE)ENGINE UNIT
1416 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
REMOVAL
1. REMOVE HOOD
NOTICE:
Be careful not to damage the body or glass with the hood
end.
2. REMOVE ENGINE UNDER COVER
3. DRAIN ENGINE COOLANT
4. DRAIN ENGINE OIL
5. REMOVE ENGINE COVER
Remove the 4 nuts and engine cover.
6. REMOVE AIR CLEANER INLET
7. REMOVE AIR CLEANER, MAF METER AND INTAKE
AIR RESONATOR ASSEMBLY
(a) Disconnect the MAF meter connector.
(b) Disconnect the engine wire clamp from the air cleaner
case.
(c) Disconnect the EVAP hose from the air cleaner case.
(d) Disconnect the PS air hose from the No.4 timing belt cov-
er.
(e) Disconnect the PCV hose from the No.2 cylinder head
cover.
(f) Loosen the hose clamp bolt holding the intake air resona-
tor to the throttle body.
(g) Remove the 3 bolts, the air cleaner, MAF meter and intake
air resonator assembly.
8. DISCONNECT ACCELERATOR CABLE FROM EN-
GINE
9. REMOVE RADIATOR ASSEMBLY (See page CO±18)
10. REMOVE DRIVE BELT (See page CH±1)
11. REMOVE FRONT SUSPENSION MEMBER BRACE
Remove the 6 bolts and brace.