Lexus SC300 / Lexus SC400. Manual - part 423

REMOVAL OF TIMING BELT

(See Components on page EM–23)

1. 

REMOVE WATER PUMP PULLEY AND RADIATOR
(See steps 1 to 3, 6 and 7 on pages EM–64 and 66)

2. 

REMOVE NO. 3 AND NO. 2 TIMING BELT COVERS
(a)  Remove the oil filler cap.
(b)  Using a 5 mm hexagon wrench, remove the nine bolts,

No. 3, No. 2 timing belt covers and gasket.

3. 

REMOVE DRIVE BELT TENSIONER
Remove the three bolts and tensioner.

4. 

SET NO. 1 CYLINDER TO TDC/COMPRESSION
(a)  Turn the crankshaft pulley and align its groove with

timing mark ”0” of the No. 1 timing belt cover.

NOTICE: Always turn the crankshaft clockwise.

(b)  Check that the timing marks of the camshaft timing

pulleys are aligned with the timing marks of the No. 4
timing belt cover.

If not, turn the crankshaft one revolution (360

°

).

5.  REMOVE TIMING BELT FROM CAMSHAFT TIMING

PULLEYS
HINT: (Re–using timing belt)
Place matchmarks on the timing belt and camshaft timing
pulleys as shown in the illustration.

EM–24

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ENGINE MECHANICAL

Timing Belt

(a)  Alternately loosen the two bolts, and remove them, the

tensioner and dust boot.

(b)  Disconnect the timing belt from the camshaft timing

pulleys.

6. 

REMOVE CAMSHAFT TIMING PULLEYS
Using SST, remove the bolt for the timing pulley. Remove
both timing pulleys.
SST 09278–54012

7. 

REMOVE CRANKSHAFT PULLEY
(a)  Using SST to hold the crankshaft pulley, loosen the

pulley mounting bolt.

SST 09213–54015 (91651–60855) and 09330–00021
(b)  Remove SST and pulley bolt.

(c)  Using SST, remove the pulley.
SST 09213–31021

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ENGINE MECHANICAL

Timing Belt

EM–25

8. 

REMOVE NO. 1 TIMING BELT COVER
Remove the five bolts, timing belt cover and two gaskets.

9. 

REMOVE TIMING BELT GUIDE

10.  REMOVE TIMING BELT

HINT (When re–using timing belt): Draw an arrow on the tim-
ing belt in the direction of engine revolution, and place match-
marks on the timing belt and crankshaft timing pulley.

11.  REMOVE IDLER PULLEY

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

12.  REMOVE CRANKSHAFT TIMING PULLEY

If the pulley cannot be removed by hand, use SST to remove
the crankshaft timing pulley.
SST 09213–60017 (09213–00020, 09213–00030,

09213–00040, 09213–00050)

EM–26

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ENGINE MECHANICAL

Timing Belt

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 make use of timing belt tension when
installing or removing the mount 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.

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

if either the camshaft or water pump 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.

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

check the belt guide and the alignment of each pulley.

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ENGINE MECHANICAL

Timing Belt

EM–27