Lexus SC300 / Lexus SC400. Service manual — part 563

16. INSTALL TIMING BELT TENSIONER

(a) Temporarily install the tensioner with the two bolts.
(b) Alternately tighten the two bolts.

Torque: 26 N

⋅

m (270 kgf

⋅

cm, 20 ft

⋅

lbf)

(c) Using

pliers, remove the 1.27 mm hexagon wrench from

the tensioner.

17. CHECK

VALVE

TIMING

(a) Turn the crankshaft pulley two revolutions from TDC to

TDC.

NOTICE: Always turn the crankshaft clockwise.

(b) Check that each pulley aligns with the timing marks as

shown in the figure.

If the marks do not align, remove the timing belt and reinstall
it.

18. INSTALL

SPARK PLUGS

Using a 16 mm plug wrench, install the eight spark plugs.

Torque: 18 N

⋅

m (180 kgf

⋅

cm, 13 ft

⋅

lbf)

–

ENGINE MECHANICAL

Timing Belt

EM–51

19. INSTALL DRIVE BELT TENSIONER

Install the tensioner with the bolt and two nuts.

Torque: 16 N

⋅

m (160 kgf

⋅

cm, 12 ft

⋅

lbf)

HINT: Use bolt 106 mm (4.17 in.) in length.

20. INSTALL

ALTERNATOR

(a) Install the alternator and A/T oil cooler pipe bracket with

the bolt and nut.

Torque: 37 N

⋅

m (380 kgf

⋅

cm, 27 ft

⋅

lbf)

(b) Connect the alternator connector.
(c) Connect the alternator wire with the nut and cap.

21. INSTALL RH DISTRIBUTOR HOUSING

(a) Install the distributor housing with the three bolts.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

HINT:

•

The RH distributor housing is marked with ”R”.

•

Each bolt length is indicated in the illustration.

Bolt length: A 38 mm (1.50 in.)

B 96 mm (3.78 in.)

(b) Connect the cam position sensor connector.

22. INSTALL LH DISTRIBUTOR HOUSING

(a) Install the distributor housing with the three bolts.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

HINT:

•

The LH distributor housing is marked with ”L”.

•

Each bolt length is indicated in the illustration.

Bolt length: A 38 mm (1.50 in.)

B 80 mm (3.15 in.)

23. INSTALL

DISTRIBUTOR

ROTORS

(a) Align the protrusion of the distributor rotor with the

groove of the camshaft timing pulley.

(b) Install the distributor rotor with the two bolts. Install the

two distributor rotors.

Torque: 3.8 N

⋅

m (39 kgf

⋅

cm, 34 in.

⋅

lbf)

EM–52

–

ENGINE MECHANICAL

Timing Belt

24. INSTALL

DISTRIBUTOR CAPS

Install the distributor cap with the three bolts. Install the two
distributor caps.

Torque: 3.8 N

⋅

m (39 kgf

⋅

cm, 34 in.

⋅

lbf)

25. INSTALL RH NO.2 TIMING BELT COVER

(a) Install the four gaskets to the timing belt cover.
(b) Install the connector grommet to the timing belt cover.
(c) Install the timing belt cover with the five bolts.

Torque (12 mm head bolt):

16 N

⋅

m (160 kgf

⋅

cm, 12 ft

⋅

lbf)

HINT (12 mm head bolt): Use bolts 106 mm (4.17 in.) in
length.
(d) Install the wire clamp to the timing belt cover.
(e) Install the cam position sensor connector to the ignition

coil bracket.

26. INSTALL LH NO.2 TIMING BELT COVER

(a) Install the two gaskets to the timing belt cover.
(b) Run the cam position sensor wire through the timing belt

cover hole.

(c) Install the timing belt cover and connector bracket with

the three bolts.

(d) Connect the cam position sensor connector.
(e) Install

cam

position

sensor

connector to connector

bracket.

(f) Install the connector grommet to the timing belt cover

hole.

27. INSTALL DRIVE BELT IDLER PULLEY

Install the idler pulley and cover plate with the pulley bolt.

Torque: 37 N

⋅

m (380 kgf

⋅

cm, 27 ft

⋅

lbf)

–

ENGINE MECHANICAL

Timing Belt

EM–53

28. INSTALL HIGH–TENSION CORDS, HIGH–TENSION

CORD CLAMP AND LOWER HIGH–TENSION CORD
COVER ASSEMBLY
(a) Install the lower high–tension cord cover with the bolt.
(b) Connect the high–tension cord to RH ignition coil.

(c) Connect the four high–tension cord to the RH spark

plugs.

(d) Install the RH rear and front high–tension cord clamps

with the two bolts.

HINT: Place the front and rear ends of the front hightension
cord clamp on the rear high–tension cord clamp and lower
high–tension cord cover.

(e) Connect the four high–tension cord to the LH spark

plugs.

(f) Install the LH rear and front high–tension cord clamps

with the two bolts.

HINT: Place the front and rear ends of the front hightension
cord clamp on the rear high–tension cord clamp and lower
high–tension cord cover.
(g) Fit the high–tension cords to the high–tension cord

clamp. (See page

IG–16

)

29. INSTALL RH NO.3 TIMING BELT COVER

(a) Install the three gaskets to the timing belt cover.
(b) Fit portion A of the timing belt cover, matching it with the

lower high–tension cord cover.

(c) Install the timing belt cover with the three bolts.

30. INSTALL VSV FOR EVAP SYSTEM

Install the VSV with the two bolts.

EM–54

–

ENGINE MECHANICAL

Timing Belt