Lexus SC300 / Lexus SC400. Manual - part 430

3. 

INSPECT TIMING BELT TENSIONER
(a)  Visually check tensioner for oil leakage.
HINT: If there is only the faintest trace of oil on the seal on the
push rod side, the tensioner is all right.
If leakage is found, replace the tensioner.

(b)  Hold the tensioner in both hands and push the push rod

strongly against the floor or wall to check that it doesn’t
move.

If the push rod moves, replace the tensioner.

(c)  Measure the protrusion of the push rod from the housing

end.

Protrusion: 10.5–11.5 mm (0.413–0.453 in.)

If the protrusion is not as specified, replace the tensioner.

INSTALLATION OF TIMING BELT

(See Components pages 

EM–33

 and 34)

1. 

INSTALL CRANKSHAFT TIMING PULLEY
(a)  Align the pulley set key on the crankshaft with the key

groove of the timing pulley.

(b) Using 

SST and a hammer, tap in the timing pulley, facing

the flange side rearward.

SST 09223–46011

2. 

INSTALL NO. 1 IDLER PULLEY
(a)  Apply adhesive to two or three threads of the pulley bolt

end.

Adhesive: Part No. 08833–00080, THREE BOND 1344, LOCTITE

242 OR equivalent

(b)  Using a 10 mm hexagon wrench, install the plate washer

and idler pulley with the pulley bolt. Torque the pulley
bolt.

Torque: 34 N

⋅

m (350 kgf

⋅

cm, 25 ft

⋅

lbf)

(c)  Check that the pulley bracket moves smoothly.

EM–46

–

ENGINE MECHANICAL

Timing Belt

3. 

INSTALL NO. 2 IDLER PULLEY
(a)  Install the idler pulley with the pulley bolt. Torque the

pulley bolt.

Torque: 34 N

⋅

m (350 kgf

⋅

cm, 25 ft

⋅

lbf)

(b)  Check that the idler pulley moves smoothly.

4. 

TEMPORARILY INSTALL TIMING BELT
NOTICE: The engine should be cold.
(a)  Using the crankshaft pulley bolt, turn the crankshaft and

align the timing marks of the crankshaft timing pulley
and oil pump body.

(b) Remove 

any oil or water on the crankshaft timing pulley,

No. 1 idler pulley and No. 2 idler pulley, and keep them
clean.

(c)  Align the installation mark on the timing belt with the dot

mark of the crankshaft timing pulley.

(d) Install 

the timing belt on the crankshaft timing pulley, No.

1 idler pulley and No. 2 idler pulley.

5.  INSTALL TIMING BELT GUIDE (NO. 1 CRANK ANGLE

SENSOR PLATE)
Install the belt guide, facing the cup side forward.

6. 

INSTALL TIMING BELT COVER SPACER
(a)  Install the gasket to the spacer.
(b)  Install the spacer.

–

ENGINE MECHANICAL

Timing Belt

EM–47

7. 

INSTALL NO.1 TIMING BELT COVER
(a)  Install the gasket to the timing belt cover.
(b)  Install the timing belt cover with the four bolts.

8. 

INSTALL HYDRAULIC PUMP
(a)  Install the hydraulic pump and solenoid valve connector

clamp and engine speed sensor wire clamp with the two
bolts and two nuts.

Torque:

12 mm heads 16 N

⋅

m (160 kgf

⋅

cm, 12 ft

⋅

lbf)

Others 30 N

⋅

m (310 kgf

⋅

cm, 22 ft

⋅

lbf)

HINT: Each bolt length is indicated in the illustration.
Bolt length:

A 106 mm (4.17 in.) for 12 mm head
B 114 mm (4.49 in.) for 14 mm head

(b)  Connect the solenoid valve connector.

9. 

INSTALL CRANKSHAFT PULLEY
(a)  Align the pulley set key on the crankshaft with the key

groove of the pulley.

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

(c)  Using SST, install and torque the pulley bolt.
SST 09213–70010 and 09330–00021

Torque: 245 N

⋅

m (2,500 kgf

⋅

cm, 181 ft

⋅

lbf)

10.  INSTALL RH CAMSHAFT TIMING PULLEY

(a)  Align the knock pin on the camshaft with the knock pin

groove of the timing pulley.

(b)  Slide the timing pulley, facing the ”R” mark forward.
(c)  Using SST, install and torque the pulley bolt.
SST 09278–54012

Torque: 108 N

⋅

m (1,100 kgf

⋅

cm, 80 ft

⋅

lbf)

EM–48

–

ENGINE MECHANICAL

Timing Belt

11.  INSTALL LH CAMSHAFT TIMING PULLEY

(a)  Align the knock pin on the camshaft with the knock pin

groove of the timing pulley.

(b)  Slide the timing pulley, facing the ”L” mark forward.
(c)  Using SST, install and torque the pulley bolt.
SST 09278–54012

Torque: 108 N

⋅

m (1,100 kgf

⋅

cm, 80 ft

⋅

lbf)

12.  SET NO.1 CYLINDER TO TDC/COMPRESSION

(a) (Crankshaft 

Pulley 

Position)

Turn the crankshaft pulley, and align its groove with the
”O” timing mark of the No.1 timing belt cover.

(b)  (Camshaft Timing Pulley Position)

Using SST, turn the camshaft timing pulley, and align the
timing marks of the camshaft timing pulley and timing
belt rear plate.

SST 09278–54012

13. INSTALL TIMING BELT TO LH CAMSHAFT TIMING

PULLEY
(a) Align 

the installation mark on the timing belt with the end

of the hydraulic pump.

(b)  Remove any oil or water on the LH camshaft timing

pulley, and keep it clean.

(c)  Using SST, slightly turn the LH 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 LH camshaft timing pulley.

SST 09278–54012

–

ENGINE MECHANICAL

Timing Belt

EM–49