Lexus SC300 / Lexus SC400. Service manual — part 450

(k) Alternately tighten the two bearing cap bolts on the rear

bearing cap of the intake camshaft in several passes.

Torque: 16 N

⋅

m (160 kgf

⋅

cm, 12 ft

⋅

lbf)

(l) Bring 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.

C.

Install intake camshaft to LH cylinder head
(a) Apply MP grease to the thrust portion of the camshaft.
(b) Place the intake camshaft at 60

°

angle of the timing

mark (one dot mark) on the cylinder head.

(c) Remove any old packing (FIPG) material.
(d) Apply seal packing to the bearing cap (mark ”I1”) as

shown.

Seal packing: Part No. 08826–00080 or equivalent

(e) Install the front bearing cap (mark ”I1”) with the arrow

mark facing forward.

HINT:

•

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

•

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

EM–98

–

ENGINE MECHANICAL

Cylinder Heads

(f) Install the other bearing caps in the sequence shown

with the arrow mark facing forward.

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

(g) Apply

a

light coat of engine oil on the threads and under

the heads (A only) of the bearing cap bolts.

HINT: Do not apply engine oil under the heads of the bearing
cap bolts (B).
(h) Install a new seal washer to the bearing cap bolt (B).

Install the eight bearing cap bolts as shown.

HINT:

•

Use bearing cap bolts 38 mm (1.50 in.) in length. The
bolts are black (A) or silver (B) in color. Install the two
silver bolts to the front bearing cap. Install the six black
bolts to the other positions.

•

After installing the oil feed pipe, install the two bolts to
the bearing cap second from the front as directed in step
D (i).

(i)

Uniformly tighten the eight bearing cap bolts in several
passes in the sequence shown.

Torque: 16 N

⋅

m (160 kgf

⋅

cm, 12 ft

⋅

lbf)

D.

Install exhaust camshaft to LH cylinder head
(a) Set the timing mark (two 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 (two dot marks) of the camshaft

drive and driven gears.

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

–

ENGINE MECHANICAL

Cylinder Heads

EM–99

(e) Check

that the exhaust camshaft moves smoothly in the

thrust direction.

(f) Install the front bearing cap with the arrow mark facing

forward.

HINT:

•

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

•

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

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

with the arrow mark facing forward.

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

(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 ten 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 pipe. Install the eight 38 mm (1.50 in.) bolts in the other
positions.

(j) Uniformly tighten the eight bearing cap 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)

EM–100

–

ENGINE MECHANICAL

Cylinder Heads

(k) Alternately tighten the two bearing cap bolts on the

bearing cap of the intake camshaft second from the front
in several passes.

Torque: 16 N

⋅

m (160 kgf

⋅

cm, 12 ft

⋅

lbf)

(l) Bring 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 23 on pages

EM–15

to 22)

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

Valve clearance:

Intake 0.15–0.25 mm (0.006–0.010 in.)

Exhaust 0.25–0.35 mm (0.010–0.014 in.)

9.

INSTALL CAMSHAFT OIL SEALS
(a) Apply MP grease to a new oil seal lip.

(b) Using SST and a hammer, tap in the two oil seals.
SST 09223–46011

10. INSTALL SEMI–CIRCULAR PLUGS

(a) Remove any oil packing (FIPG) material.
(b) Apply seal packing to the semi–circular plug groove.

Seal packing: Part No. 08826–00080 or equivalent

–

ENGINE MECHANICAL

Cylinder Heads

EM–101