Lexus GS300/400 (2000 year). Manual - part 134

A11125

Throttle Body and Intake Air Connector Assembly

Water Bypass Hose

PCV Hose

EVAP Hose



 Gasket

Air Assist Hose

Vacuum
Hose

PS Air Hose

Air Intake Chamber

Engine Wire
Clamp

Drive Belt
Tensioner

Clamp Bracket

Ground Strap

Fuel Pressure
Pulsation Damper

Clamp Bracket

Water Bypass 
Outlet

No.1 Water Bypass Pipe

No.3 Timing Belt Cover



 O–Ring

Oil Filler Cap

Fuel 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

Gasket

Gasket

21 (210, 15)

32.5 (325, 24)



 Gasket



 Gasket

Engine Wire
Clamp



 O–Ring



 O–Ring

Oil 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 Boot

Engine Wire
Clamp

No.2 Vacuum Pipe

Hose Clamp

Vacuum Control
Valve Set

EM–30

–

ENGINE MECHANICAL (2JZ–GE)

CYLINDER HEAD

1384

A11124

Ignition Coils and
High–Tension Cord
Assembly

Gasket

No.2 Cylinder Head Cover

Camshaft Timing Oil Control Valve

Exhaust 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



 Gasket

Oil 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 part

x 12

28 (280, 21)

Starter Wire

Straight
Screw Plug

Timing Belt

–

ENGINE MECHANICAL (2JZ–GE)

CYLINDER HEAD

EM–31

1385

A02822



 Oil Seal



 Non–reusable part

 Precoated part



 Gasket



 Gasket

ECT Sensor



 Valve Guide Bushing

Valve

Water Outlet with Water Bypass Hose

Camshaft Position Sensor

Engine Hanger

Heater Union

Cylinder Head

Spring Seat

Valve Spring

Spring Retainer

Keeper

Adjusting Shim

Valve Lifter

EM–32

–

ENGINE MECHANICAL (2JZ–GE)

CYLINDER HEAD

1386

EM0D1–05

A11132

Compression Tester

–

ENGINE MECHANICAL (2JZ–GE)

COMPRESSION

EM–3

1357

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.