Lexus SC300 / Lexus SC400. Service manual — part 366

(d) Alternately loosen and remove the 2 bearing cap bolts

holding the intake camshaft side of the oil feed pipe to the
cylinder head.

(e) Uniformly loosen and remove the 8 bearing cap bolts in

several passes, in the sequence shown.

(f) Remove the oil feed pipe, 4 bearing caps and exhaust

camshaft.

B. Remove intake camshaft from RH cylinder head
(a) Remove the rear bearing cap.
(b) Set the timing mark (1 dot mark) of the camshaft drive gear

at approx. 45

angle by turning the hexagon wrench head

portion of the intake camshaft with a wrench.

(c) Uniformly loosen and remove the 8 bearing cap bolts in

several passes, in the sequence shown.

(d) Remove the 4 bearing caps, oil seal and intake camshaft.

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1UZ–FE ENGINE

ENGINE MECHANICAL

EG–87

C. Remove exhaust camshaft from LH cylinder head
(a) Boring the service bolt hole of the driven sub–gear upward

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

(b) Secure the exhaust camshaft sub–gear to drive gear with a

service bolt.
Recommended service bolt:

6 mm for thread diameter
1.0 mm for thread pitch
16 – 20 mm (0.63 – 0.79 in.) for bolt length

HINT: When removing the camshaft, make sure that the tor-
sional spring force of the sub–gear has been eliminated by
the above operation.

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

at approx. 15

angle by turning the hexagon wrench head

portion of the exhaust camshaft with a wrench.

(d) Alternately loosen and remove the 2 bearing cap bolts

holding the intake camshaft side of the oil feed pipe to the
cylinder head.

(e) Uniformly loosen and remove the 8 bearing cap bolts in

several passes, in the sequence shown.

(f) Remove the oil feed pipe, 4 bearing caps and exhaust

camshaft.

EG–88

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1UZ–FE ENGINE

ENGINE MECHANICAL

D. Remove intake camshaft from LH cylinder head
(a) Remove the bearing cap second from the front.
(b) Set the timing mark (1 dot mark) of the camshaft drive gear

at approx. 60

angle by turning the hexagon wrench head

portion of the intake camshaft with a wrench.

(c) Uniformly loosen and remove the 8 bearing cap bolts in

several passes, in the sequence shown.

(d) Remove the 4 bearing caps, oil seal and intake camshaft.

HINT: Arrange the bearing caps in correct order.

38. DISASSEMBLE EXHAUST CAMSHAFTS
(a) Mount the hexagon wrench head portion of the camshaft in

a vise.
NOTICE: Be careful not to damage the camshaft.

(b) Insert service bolt A into the service hole of the camshaft

sub–gear.

(c) Using a screwdriver, turn the sub–gear clockwise, and

remove service bolt B.
NOTICE: Be careful not to damage the camshaft.

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EG–89

(d) Using snap ring pliers, remove the snap ring.

(e) Remove the following parts:

(1) Wave

washer

(2) Camshaft

sub–gear

(3) Camshaft gear spring

HINT: Arrange the camshaft sub–gears and gear spring (RH
and LH sides).

39. REMOVE CIRCULAR PLUGS

Remove the 2 bolts, seal washers, bearing cap and circular
plug. Remove the 2 circular plugs.

HINT: Arrange the bearing caps (RH and LH sides).

EG–90

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ENGINE MECHANICAL