Lexus SC300 / Lexus SC400. Manual — part 561

(a) Disconnect the solenoid valve connector.
(b) Remove the two mounting bolts and two mounting nuts.
(c) Disconnect the engine speed sensor wire clamp.
(d) Remove the hydraulic pump.

32. REMOVE NO.1 TIMING BELT COVER

Remove the four bolts, timing belt cover and gasket.

33. REMOVE TIMING BELT COVER SPACER

Remove the cover spacer and gasket.

34. REMOVE TIMING BELT GUIDE (NO.1 CRANK ANGLE

SENSOR PLATE)

35. REMOVE TIMING BELT

HINT (Re–using timing belt): If the installation marks have
disappeared, place a new installation mark on the timing belt
to match the dot mark of the crankshaft timing pulley.

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ENGINE MECHANICAL

Timing Belt

EM–43

36. REMOVE NO.2 IDLER PULLEY

Remove the pulley bolt and idler pulley.

37. REMOVE NO.1 IDLER PULLEY

Using a 10 mm hexagon wrench, remove the bolt, idler pulley
and plate washer.

38. REMOVE CRANKSHAFT TIMING PULLEY

Using SST, remove the timing pulley.
SST 09213–60017 (09213–00050)

INSPECTION OF TIMING BELT
COMPONENTS

1.

INSPECT TIMING BELT
NOTICE:

•

Do not bend, twist or turn the timing belt inside out.

•

Do not allow the timing belt to come into contact with oil,

water or steam.

•

Do not utilize timing belt tension when installing or

removing the mounting bolt of the camshaft timing

pulley.

If there are any defects as shown in the illustrations, check
the following points:
(a) Premature

parting

•

Check for proper installation.

•

Check the timing cover gasket for damage and
proper installation.

EM–44

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ENGINE MECHANICAL

Timing Belt

(b) If the belt teeth are cracked or damaged, check to see

if either the camshaft is locked.

(c) If there is noticeable wear or cracks on the belt face,

check to see if there are nicks on the side of the idler
pulley lock and water pump.

(d) If there is wear or damage on only one side of the belt,

check the belt guide and the alignment of the each
pulley.

(e) If there is noticeable wear on the belt teeth, check timing

belt cover for damage, correct gasket installation. and
the foreign material on the pulley teeth.

If necessary, replace the timing belt.

2.

INSPECT IDLER PULLEYS
Check the turning smoothness of the idler pulley.
If necessary, replace the idler pulley.

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ENGINE MECHANICAL

Timing Belt

EM–45

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

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ENGINE MECHANICAL

Timing Belt