Lexus RX300 (MCU15). Service manual — part 445

A05195

Intake:

Service Bolt

A05208

Exhaust:

90

°

P12805

Exhaust:

Front

A02008

Exhaust:

Seal

Packing

A05209

Exhaust:

EM–64

–

ENGINE MECHANICAL

CYLINDER HEAD

LEXUS RX300 (RM785E)

(7)

Remove the service bolt.

6.

INSTALL CAMSHAFTS OF LH 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 (1 dot mark) 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

(7)

Install the 5 bearing caps in their proper locations.

A05210

Exhaust:

8

7

6

5

4

3

2

1

9

10

A05211

Intake:

Align

A05214

Intake:

A05213

Intake:

6

5

4

3

2

1

9

10

7

8

A05198

Intake:

Service Bolt

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–65

LEXUS RX300 (RM785E)

(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 (1 dot mark) 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 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)

(7)

Remove the service bolt.

7.

CHECK AND ADJUST VALVE CLEARANCE (See page
EM–4)

Turn the camshaft and position the cam lobe upward, and
check and adjust the valve clearance.

A05215

Seal Packing

A05217

Front

Semi–Circular Plug

A05216

: Seal Packing

Front

RH side:

LH side:

EM–66

–

ENGINE MECHANICAL

CYLINDER HEAD

LEXUS RX300 (RM785E)

8.

INSTALL SEMI–CIRCULAR PLUGS

(a)

Remove any old packing (FIPG) material.

(b)

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

(c)

Install the 2 semi–circular plugs to the cylinder heads.

9.

INSTALL CYLINDER HEAD COVERS

(a)

Apply seal packing to the cylinder heads as shown in the
illustration.
Seal packing: Part No. 08826–00080 or equivalent

(b)

Install the gasket to the cylinder head cover.

(c)

Install the cylinder head cover with the 9 bolts. Uniformly
tighten the bolts in several passes. Install the 2 cylinder
head covers.
Torque: 8.0 N·m (80 kgf·cm, 69 in.·lbf)

A05190

A05192

New O–Ring

A05191

A05188

Inlet Pipe

Rear
Plate

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–67

LEXUS RX300 (RM785E)

10.

INSTALL RH EXHAUST MANIFOLD

(a)

Install a new gasket and the exhaust manifold with the 6
nuts. Uniformly tighten the nuts in several passes.
Torque: 49 N·m (500 kgf·cm, 36 ft·lbf)

(b)

Install the exhaust manifold stay with the bolt and nut. Al-
ternately tighten the bolt and nut.
Torque: 34 N·m (350 kgf·cm, 25 ft·lbf)

(c)

Connect the A/F sensor (bank 1 sensor 1) connector.

11.

INSTALL PS PUMP BRACKET
Torque: 43 N·m (440 kgf·cm, 32 ft·lbf)

12.

INSTALL OIL DIPSTICK AND GUIDE

(a)

Install a new O–ring to the dipstick guide.

(b)

Apply soapy water to the O–ring.

(c)

Push in the dipstick guide end into the guide hole of the
No. 1 oil pan.

(d)

Install the dipstick guide with the bolt.
Torque: 8.0 N·m (80 kgf·cm, 69 in.·lbf)

(e)

Install the dipstick.

13.

INSTALL LH EXHAUST MANIFOLD

(a)

Install a new gasket and the exhaust manifold with the 6
nuts. Uniformly tighten the nuts in several passes.
Torque: 49 N·m (500 kgf·cm, 36 ft·lbf)

(b)

Install the exhaust manifold stay with the bolt and nut. Al-
ternately tighten the bolt and nut.
Torque: 20 N·m (200 kgf·cm, 14 ft·lbf)

(c)

Connect the A/F sensor (bank 2 sensor 1) connector.

14.

INSTALL WU–TWC

Install a new gasket and the WU–TWC with the 2 nuts.

Torque: 62 N·m (630 kgf·cm, 46 ft·lbf)

15.

INSTALL WATER INLET PIPE

(a)

Install a new O–ring to the water inlet pipe.

(b)

Apply soapy water to the O–ring.

(c)

Connect the water inlet pipe to the water inlet.

(d)

Install the bolt holding the water inlet pipe to the cylinder
head.
Torque: 19.5 N·m (200 kgf·cm, 14 ft·lbf)

16.

INSTALL CYLINDER HEAD REAR PLATE
Torque: 8.0 N·m (80 kgf·cm, 69 in.·lbf)

17.

INSTALL ENGINE WIRE PROTECTOR