Lexus SC300 / Lexus SC400. Manual - part 431

(d)  Using SST, align the timing marks of the LH camshaft

pulley and timing belt rear plate.

SST 09278–54012
(e)  Check that the timing belt has tension between the

crankshaft timing pulley and LH camshaft timing pulley.

14. INSTALL TIMING BELT TO RH CAMSHAFT TIMING

PULLEY
(a)  Remove any oil or water on the RH camshaft timing and

water pump pulley, and keep them clean.

(b)  Using SST, slightly turn the RH camshaft timing pulley

clockwise. Align the installation mark on the timing belt
with the timing mark of the camshaft timing pulley, and
hang the timing belt on the RH camshaft timing pulley.

SST 09278–54012

(c)  Using SST, align the timing marks of the RH camshaft

pulley and timing belt rear plate.

SST 09278–54012
(d)  Check that the timing belt has tension between the RH

camshaft timing pulley and LH camshaft pulley.

15.  SET TIMING BELT TENSIONER

(a)  Using a press, slowly press in the push rod using

981–9,807 N (100–1,000  kgf, 220–2,205 lbf) of
pressure.

(b) Align 

the holes of the push rod and housing, pass a 1.27

mm hexagon wrench through the holes to keep the
setting position of the push rod.

(c)  Release the press.

(d)  Install the dust boot to the tensioner.

EM–50

–

ENGINE MECHANICAL

Timing Belt

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