Lexus SC300 / Lexus SC400. Manual — part 374

D.

Install exhaust camshaft to LH cylinder head

(a) Set the timing mark (2 dot marks) of the camshaft drive gear

at 15

angle by turning the hexagon wrench head portion of

the intake camshaft with a wrench.

(b) Apply MP grease to the thrust portion of the exhaust

camshaft.

(c) Align the timing marks (2 dot marks) of the camshaft drive and

driven gears.

(d) Place the exhaust camshaft on the cylinder head.

(e) Check that the exhaust camshaft moves smoothly in the

thrust direction.

(f)

Install the front bearing cap (mark “E1”) with the arrow mark
facing forward.
HINT:

•

Installing the front bearing cap will determine the thrust
portion of the camshaft.

•

Align the allow marks at the front and rear of the cylinder
head with the mark on the bearing cap.

(g) Install the other 3 bearing caps in the sequence shown with

the arrow marks facing forward.
HINT: Align the arrow marks at the front and rear of the cylin-
der head with the mark on the bearing cap.

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ENGINE MECHANICAL

EG–119

(h) Apply a light coat of engine oil on the threads and under the

heads of the bearing cap bolts.

(i)

Install the oil feed pipe and 10 bolts.
HINT: Use bearing cap bolts 38 mm (1.50 in.) and 52 mm
(2.05 in.) in length. Use black colored 38 mm (1.50 in.) bolts.
Install the two 52 mm (2.05 in.) bolts in outside positions of
the oil feed pipe. Install the eight 38 mm (1.50 in.) bolts in the
other positions.

(j) Uniformly tighten the 8 bolts on the bearing caps of the

exhaust camshaft in several passes, in the sequence shown.

Torque: 16 N

⋅

m (160 kgf

⋅

cm, 12 ft

⋅

lbf)

(k) Alternately

tighten the 2 bolts on the bearing cap of the intake

camshaft 2nd from the front in several passes.

Torque: 16 N

⋅

m (160 kgf

⋅

cm, 12 ft

⋅

lbf)

(l) Boring

the

service bolt installed in the driven subgear upward

by turning the hexagon wrench head portion of the camshaft
with a wrench.

(m) Remove the service bolt.

8.

CHECK AND ADJUST VALVE CLEARANCE
(See steps 19 to 22 on pages

EG–19

to 21)

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

Valve clearance (Cold):

Intake

0.15 – 0.25 mm (0.006 – 0.010 in.)

Exhaust

0.25 – 0.35 mm (0.010 – 0.014 in.)

EG–120

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ENGINE MECHANICAL

EG22W–02

9.

INSTALL CAMSHAFT OIL SEALS

(a) Apply MP grease to a new oil seal lip.

(b) Using SST and a hammer, tap in the 2 oil seals

SST 09223–46011

10. 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 4 semi–circular plugs to the cylinder heads.

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EG–121

11. INSTALL CYLINDER HEAD COVER
(a) Remove any old packing (FIPG) material.
(b) Apply seal packing to the cylinder heads as shown in the

illustration.

Seal packing:

Part No. 08826–00080 or equivalent

(c) Install the gasket to the cylinder head cover.
(d) Install the seal washer to the bolt.
(e) Install the cylinder head cover with the 8 bolts. Uniformly

tighten the bolts in several passes. Install the 2 cylinder head
covers.

Torque: 5.9 N

⋅

m (60 kgf

⋅

cm, 52 in.

⋅

lbf)

12. INSTALL ENGINE HANGERS

Install the engine hanger with the 2 bolts. Install the 2 engine
hangers.

Torque: 37 N

⋅

m (380 kgf

⋅

cm, 27 ft

⋅

lbf)

13. INSTALL ENGINE WIRE TO CYLINDER HEADS
(a) Install the engine wire protector to the RH cylinder head with

the 2 bolts.

(b) Install the ground strap to RH cylinder head with the bolt.

EG–122

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ENGINE MECHANICAL