Lexus RX300 (MCU15). Manual — part 444

A05220

EM0BC–03

A05218

12 Pointed Head Bolt

Front

7

2

4

6

5

3

1

8

7

2

4

6

5

3

1

8

A05223

Painted Mark

Front

90

°

EM–60

–

ENGINE MECHANICAL

CYLINDER HEAD

LEXUS RX300 (RM785E)

INSTALLATION

1.

PLACE CYLINDER HEAD ON CYLINDER BLOCK

(a)

Place 2 new cylinder head gaskets in position on the cylin-
der block.

NOTICE:
Be careful of the installation direction.
(b)

Place the 2 cylinder heads in position on the cylinder head
gaskets.

2.

INSTALL 12 POINTED HEAD CYLINDER HEAD BOLTS

HINT:

S

The cylinder head bolts are tightened in 2 progressive
steps (steps (c) and (e)).

S

If any bolt is broken or deformed, replace it.

(a)

Apply a light coat of engine oil on the threads and under
the heads of the cylinder head bolts.

(b)

Install the plate washer to the cylinder head bolt.

(c)

Install and uniformly tighten the cylinder head bolts on
each cylinder head, in several passes, in the sequence
shown, then repeat for the other side, as shown.
Torque: 54 N·m (550 kgf·cm, 40 ft·lbf)

If any of the cylinder head bolts does not meet the torque speci-
fication, replace the cylinder head bolt.

(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 the

front.

A05221

Recessed Head Bolt

Front

8 mm Hexagon Wrench

P12595

Z09320

(1)

(2)

(3)

P12590

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–61

LEXUS RX300 (RM785E)

3.

INSTALL RECESSED HEAD CYLINDER HEAD BOLTS

(a)

Apply a light coat of engine oil on the threads and under
the heads of the cylinder head bolts.

(b)

Using an 8 mm hexagon wrench, install the cylinder head
bolt on each cylinder head, then repeat for the other side,
as shown.
Torque: 18.5 N·m (185 kgf·cm, 13 ft·lbf)

4.

ASSEMBLE EXHAUST CAMSHAFTS

(a)

Mount the hexagonal wrench head portion of the cam-
shaft in a vise.

NOTICE:
Be careful not to damage the camshaft.

(b)

Install the camshaft gear spring.

(c)

Install the camshaft sub–gear.

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

Install the wave washer.

(e)

Using snap ring pliers, install the snap ring.

P12974

SST

Main Gear

Sub Gear

A05201

90

°

Exhaust:

P12804

Exhaust:

Front

A02008

Exhaust:

Seal

Packing

EM–62

–

ENGINE MECHANICAL

CYLINDER HEAD

LEXUS RX300 (RM785E)

(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.

5.

INSTALL CAMSHAFTS OF RH CYLINDER HEAD

NOTICE:
Since the thrust clearance of the camshaft is small, the
camshaft must be held level while it is being installed. If the
camshaft is not level, the portion of the cylinder head re-
ceiving the shaft thrust may crack or be damaged, causing
the camshaft to seize or break. To avoid this, the following
steps should be carried out.

(a)

Install the exhaust camshaft.
(1)

Apply new engine oil to the thrust portion and jour-
nal of the camshaft.

(2)

Place the exhaust camshaft at 90

° angle of timing

mark (2 dot marks) on the cylinder head.

(3)

Apply MP grease to a new oil seal lip.

(4)

Install the oil seal to the camshaft.

(5)

Remove any old packing (FIPG) material.

(6)

Apply seal packing to the No. 1 bearing cap as
shown.

Seal packing: Part No. 08826–00080 or equivalent

A05283

Exhaust:

A05202

Exhaust:

7

A05203

Intake:

Align

A05204

Intake:

A05196

Intake:

8

7

6

5

4

3

2

1

9

10

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–63

LEXUS RX300 (RM785E)

(7)

Install the 5 bearing caps in their proper locations.

(8)

Apply a light coat of engine oil on the threads and
under the heads of the bearing cap bolts.

(9)

Install and uniformly tighten the 10 bearing cap
bolts, in several passes, in the sequence shown.

Torque: 16 N·m (160 kgf·cm, 12 ft·lbf)

(b)

Install the intake camshaft.
(1)

Apply new engine oil to the thrust portion and jour-
nal of the camshaft.

(2)

Align the timing marks (2 dot marks) of the camshaft
drive and driven gears.

(3)

Place the intake camshaft on the cylinder head.

(4)

Install the 5 bearing caps in their proper locations.

(5)

Apply a light coat of engine oil on the threads and
under the heads of the bearing cap bolts.

(6)

Install and uniformly tighten the 10 bearing cap
bolts, in several passes, in the sequence shown.

Torque: 16 N·m (160 kgf·cm, 12 ft·lbf)