Lexus LS400 (2000 year). Manual — part 93

A02872

RH Cylinder Head

LH Cylinder Head

A

A

Z15621

90

°

Painted Mark

90

°

A02867

A02868

EM–60

–

ENGINE MECHANICAL

CYLINDER HEAD

1242

NOTICE:
Do not drop the plate washer for cylinder head bolt into por-
tion A of the cylinder head. If dropped into portion A, the
plate washer will pass through the cylinder head and cylin-
der block into the oil pan.

(d)

Mark the front of the cylinder head bolt head with paint.

(e)

Retighten the cylinder head bolts by 90

°

in the numerical

order shown.

(f)

Check that the painted mark is now at a 90

°

angle to front.

5.

INSTALL ENGINE WIRE

(a)

Install the ground cable to RH cylinder head with the bolt.

(b)

Install the engine wire protector to the LH cylinder head
with the bolt.

(c)

Install the ground cable to LH cylinder head with the bolt.

(d)

Connect the 2 heated oxygen sensor connectors.

6.

INSTALL SPARK PLUGS

A02888

A02861

A02859

A02889

Service Bolt

SST

Sub Gear

Main Gear

Turn

A03172

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–61

1243

7.

ASSEMBLE EXHAUST CAMSHAFT

(a)

Install the camshaft gear spring.

(b)

Install the camshaft sub–gear.

HINT:
Attach the pins on the gears to the gear spring ends.
(c)

Install the wave washer.

(d)

Using snap ring pliers, install the snap ring.

(e)

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

NOTICE:
Be careful not to damage the camshaft.

(f)

Using SST, align the holes of the camshaft main gear and
sub–gear by turning camshaft sub–gear counterclock-
wise, and temporarily install a service bolt.
SST

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

(g)

Align the gear teeth of the main gear and sub–gear, and
tighten the service bolt.

8.

INSTALL CAMSHAFT TIMING TUBES

(a)

Place a new oil seal to the timing tube.

NOTICE:
Be careful installation direction.

A03223

Align

1

2

3

4

A03173

A03174

Align

A02863

A02890

Seal Packing

EM–62

–

ENGINE MECHANICAL

CYLINDER HEAD

1244

(b)

Align the timing tube knock pin with the knock pin groove
of the camshaft drive gear, and temporarily install the
camshaft drive gear with the 4 bolts.

(c)

Using a 5 mm hexagon wrench, uniformly tighten the 4
bolts.
Torque: 7.5 N·m (80 kgf·cm, 66 in.·lbf)

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

(d)

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

NOTICE:
Be careful not to damage the camshaft.

(e)

Align the camshaft knock pin with the camshaft timing
tube, and push the camshaft timing tube by hand until you
feel it touch the bottom.

(f)

Using a 10 mm hexagon wrench, install the set bolt.
Torque: 78 N·m (790 kgf·cm, 58 ft·lbf)

(g)

Install the seal washer and straight screw plug.
Torque: 15 N·m (150 kgf·cm, 11 ft·lbf)

9.

INSTALL CAMSHAFT HOUSING PLUGS

(a)

Remove any old packing (FIPG) material.

(b)

Apply seal packing to the camshaft housing plug grooves.
Seal packing:
Part No. 08826–00080 or equivalent

A03185

RH Cylinder Head

LH Cylinder Head

Front

A01874

Timing
Mark

No.2 Idler Pulley Bolt

Turn

A03178

Approx. 10

°

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–63

1245

(c)

Install the 2 camshaft housing plugs to the cylinder heads.

10.

INSTALL CAMSHAFTS

NOTICE:
Since the thrust clearance of the camshaft is small, the
camshaft must be kept level while it is being installed. 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)

Set the crankshaft pulley position.
Turn the crankshaft pulley clockwise or counterclockwise,
and put the timing mark of the crankshaft pulley in line 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 install the camshaft, causing dam-
age. So always set the crankshaft pulley at the correct
angle.

(b)

Install the RH camshafts.
(1)

Apply MP grease to the thrust portion of the intake
and exhaust camshafts.

(2)

Place the intake and exhaust camshafts.

(3)

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

°

angle.