Lexus LS400 (2000 year). Service manual — part 86

A02860

A04475

A03218

No.2 Idler Pulley Bolt

Timing
Mark

Crankshaft
Pulley Bolt

A02852

Rotate (25

°

)

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–37

1219

13.

REMOVE REAR WATER BYPASS JOINT

Remove the 4 nuts, water bypass joint and 2 gaskets.
14.

REMOVE VVT SENSORS

15.

REMOVE ENGINE HANGERS

16.

REMOVE OIL DIPSTICK AND GUIDE FOR A/T
(See page

EM–77

)

17.

REMOVE OIL DIPSTICK AND GUIDE FOR ENGINE
(See page

LU–9

)

18.

REMOVE CYLINDER HEAD COVERS

Remove the 9 bolts, 9 seal washers, cylinder head cover and
gasket. Remove the 2 cylinder head covers.
19.

IF NECESSARY, REMOVE SEMI–CIRCULAR PLUGS
AND CAMSHAFT HOUSING PLUGS

20.

REMOVE CAMSHAFT TIMING OIL CONTROL VALVE
(See page

SF–51

)

21.

REMOVE CAMSHAFTS

NOTICE:
Since the thrust clearance of the camshaft is small, the
camshaft must be kept level while it is being removed. If the
camshaft is not kept level, the portion of the cylinder head
receiving the shaft thrust may crack or be damaged, caus-
ing the camshaft to seize or break. To avoid this, the follow-
ing steps should be carried out.

(a)

Check the crankshaft pulley position.
Check that the timing mark of the crankshaft pulley is in
aligned with the centers of the crankshaft pulley bolt and
idler pulley bolt.

NOTICE:
Having the crankshaft pulley at the wrong angle can cause
the piston head and valve head to come into contact with
each other when you remove the camshaft, causing dam-
age. So always set the crankshaft pulley at the correct
angle.
(b)

Rotate the VVT–i pulley from left to right 2 to 3 times within
its range of movement (25

°

<50

°

CA> ) and use a waste

cloth to collect the oil from the camshaft timing oil control
valve installation hole.

NOTICE:
Approximately 20 cc (1.2 cu in.) of oil will be ejected, so
take care not to spill it.

A02853

Service Bolt

A02854

10

°

A02855

6

14

4

8

1

10

16

18

12

2

19

20

21

22

9

15

17

11

5

13

3

7

A02856

EM–38

–

ENGINE MECHANICAL

CYLINDER HEAD

1220

(c)

Remove the RH camshafts.
(1)

Boring the service bolt hole of the sub–gear upward
by turning the hexagon wrench head portion of the
exhaust camshaft with a wrench.

(2)

Secure the sub–gear to the main gear with a service
bolt.

Recommended service bolt:

Thread diameter

6 mm

Thread pitch

1.0 mm

Bolt length

16 – 20 mm

HINT:
When removing the camshafts, make sure that the torsional
spring force of the sub–gear has been eliminated by the above
operation.

(3)

Set the timing mark (1 dot mark) of the camshaft
main gear at approx. 10

°

angle by turning the hexa-

gon wrench head portion of the exhaust camshaft
with a wrench.

(4)

Uniformly loosen and remove the 22 bearing cap
bolts in several passes, in the sequence shown.

(5)

Remove the oil feed pipe, 9 bearing caps, cam shaft
timing oil control valve and camshafts.

(d)

Remove the LH camshafts.
(1)

Boring the service bolt hole of the sub–gear upward
by turning the hexagon wrench head portion of the
exhaust camshaft with a wrench.

(2)

Secure the sub–gear to the main gear with a service
bolt.

A02857

Align

A02858

6

14

4

8

1

10

16

18

2

19

20

21

22

9

5

13

3

7

12

17

11

15

A02859

A02850

SST

Service Bolt

Turn

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–39

1221

Recommended service bolt:

Thread diameter

6 mm

Thread pitch

1.0 mm

Bolt length

16 – 20 mm

HINT:
When removing the camshaft, make sure that the torsional
spring force of the sub–gear has been eliminated by the above
operation.

(3)

Align the timing mark (2 dot marks) of the camshaft
drive gear by turning the hexagon wrench head por-
tion of the exhaust camshaft with a wrench.

(4)

Uniformly loosen and remove the 22 bearing cap
bolts in several passes, in the sequence shown.

(5)

Remove the oil feed pipe, 9 bearing caps, cam shaft
timing oil control valve filter and camshafts.

HINT:
Arrange the bearing caps in correct order.

22.

DISASSEMBLE EXHAUST CAMSHAFTS

(a)

Mount the hexagon wrench head portion of the camshaft
in a vise.

NOTICE:
Be careful not to damage the camshaft.

(b)

Using SST, turn the sub–gear clockwise, and remove the
service bolt.
SST

09960–10010 (09962–01000, 09963–00500)

A02861

A02862

Do not Remove

A02863

A02865

A02867

Ground Cable

EM–40

–

ENGINE MECHANICAL

CYLINDER HEAD

1222

(c)

Using snap ring pliers, remove the snap ring.

(d)

Remove the wave washer.

(e)

Remove the camshaft sub–gear.

(f)

Remove the camshaft gear spring.

HINT:
Arrange the camshaft sub–gears and gear spring (RH and LH
sides).

23.

REMOVE CAM SHAFT TIMING TUBES

(a)

Mount the hexagon wrench head portion of the intake
camshaft in a vise.

NOTICE:

Be careful not to damage the camshaft.

The 4 bolts shown in the illust ration determine the
backlash of the gear in the timing tube, so do not re-
move them. If any of the 4 bolts are removed, install
a new camshaft timing tube assembly.

(b)

Remove the straight screw plug and seal washer.

(c)

Using a 10 mm hexagon wrench, and remove the set bolt
and camshaft timing tube.

(d)

Using a 5 mm hexagon wrench, and remove the 4 bolts,
camshaft drive gear and oil seal.

NOTICE:
Be careful not to damage the camshaft timing tube.
24.

REMOVE SPARK PLUGS

25.

REMOVE CYLINDER HEAD AND EXHAUST MAN-
IFOLD ASSEMBLIES

(a)

Disconnect the 2 heated oxygen sensor connectors.

(b)

Remove the bolt, and disconnect the ground cable from
the RH cylinder head.