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Lexus SC300 / Lexus SC400. Manual - part 428

15. REMOVE HIGH–TENSION CORDS, HIGH–TENSION

CORD CLAMPS AND LOWER HIGH–TENSION CORD
COVER ASSEMBLY
(a) Remove the two bolts holding the RH rear high–tension

cord clamp to the cylinder head.

(b) Disconnect the high–tension cords from the RH spark

plugs and distributor cap.

cord clamp to the cylinder head.

(d) Disconnect the high–tension cords from the LH spark

plugs, distributor cap and LH ignition coil.

(e) Remove the bolt holding the lower high–tension cord

cover to the water inlet housing.

(f) Disconnect the high–tension cord from the RH ignition

coil, and remove the high–tension cords, clamps and
cover assembly.

16. REMOVE DRIVE BELT IDLER PULLEY

Remove the pulley bolt, cover plate and idler pulley.

17. REMOVE RH NO.2 TIMING BELT COVER

(a) Disconnect the cam position sensor connector from the

ignition coil bracket.

EM–38

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ENGINE MECHANICAL

Timing Belt

(b) Disconnect

the

cam position sensor wire from the clamp

on the timing belt cover.

cover.

(e) Disconnect the wire clamp from the timing belt cover,

and remove the timing belt cover and four gaskets.

18. REMOVE LH NO.2 TIMING BELT COVER

(a) Disconnect

the

cam position sensor wire from the clamp

on the timing belt cover.

(b)  Disconnect the cam position sensor connector.
(c)  Remove the three mounting bolts.
(d)  Disconnect the connector grommet from the timing belt

cover, and remove the timing belt cover and two
gaskets.

19. REMOVE DISTRIBUTOR CAPS

Loosen the three bolts, and remove the distributor cap. Re-
move the two distributor caps.
HINT: Arrange the distributor caps (RH side and LH side).

20. REMOVE

DISTRIBUTOR

ROTORS

Loosen the two bolts, and remove the distributor rotor.
Remove the two distributor rotors.
HINT: Arrange the distributor rotors (RH side and LH side).

21. REMOVE

DISTRIBUTOR

HOUSINGS

(a) (RH Distributor Housing)

Disconnect the cam position sensor connector.

(b) Remove the three bolts and distributor housing.

Remove the two distributor housings.

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ENGINE MECHANICAL

Timing Belt

EM–39

22. REMOVE ALTERNATOR

(a) Disconnect the alternator connector.
(b) Remove the cap and nut, and disconnect the alternator

wire.

bracket.

(d) Remove the nut and alternator.

23. REMOVE DRIVE BELT TENSIONER

Remove the bolt, two nuts and tensioner.

24. REMOVE SPARK

PLUGS

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

25. IF RE–USING TIMING BELT, CHECK INSTALLATION

MARKS ON TIMING BELT
Check that there are four installation marks on the timing belt
by turning the crankshaft pulley as shown in the illustration.
If the installation marks have disappeared, place a new
installation mark on the timing belt before removing each
part.

26. SET NO.1 CYLINDER TO TDC/COMPRESSION

(a) Turn the crankshaft pulley and align its groove with the

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

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ENGINE MECHANICAL

Timing Belt

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

pulleys and timing belt rear plates aligned.

If not, turn the crankshaft one revolution (360

27. REMOVE TIMING BELT TENSIONER

HINT:

•

(Re–using timing belt)

If the installation marks have disappeared, before re-
moving the timing belt, place new installation marks on
the timing belt to match the timing marks of the camshaft
timing pulleys, and place a new installation mark on the
timing belt to match the end of the hydraulic pump.

•

(When replacing timing belt tensioner only)

To avoid meshing of the timing pulley and timing belt, se-
cure one of them with string. And place matchmarks on
the timing belt and RH camshaft timing pulley.

Alternately loosen the two bolts, and remove them, the ten-
sioner and dust boot.

28. DISCONNECT TIMING BELT FROM CAMSHAFT TIMING

PULLEYS
(a) Using SST, loosen the tension between the LH and RH

camshaft timing pulleys by slightly turning the LH
camshaft timing pulley clockwise.

SST 09278–54012

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ENGINE MECHANICAL

Timing Belt

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