Lexus LS400 (2000 year). Service manual — part 81

A02103

A04195

Slightly Turn

SST

A03351

Hold

SST

A01879

SST

A01880

EM–18

–

ENGINE MECHANICAL

TIMING BELT

1200

Alternately loosen the 2 bolts, and remove them, the belt ten-
sioner and dust boot.

20.

DISCONNECT TIMING BELT FROM CAMSHAFT TIM-
ING PULLEYS

(a)

Using SST, loosen the tension spring between the LH and
RH camshaft timing pulleys by slightly turning the RH
camshaft timing pulley clockwise.
SST

09960–10010 (09962–01000, 09963–00350)

(b)

Disconnect the timing belt from the camshaft timing pul-
leys.

21.

REMOVE CAMSHAFT TIMING PULLEYS

Using SST, remove the 4 bolts and timing pulley. Remove the
2 timing pulleys.

SST

09960–10010 (09962–01000, 09963–00350)

22.

REMOVE GENERATOR (See page

CH–8

)

23.

REMOVE DRIVE BELT TENSIONER

Remove the bolt, 2 nuts and belt tensioner.

24.

REMOVE CRANKSHAFT PULLEY

Using SST, remove the crankshaft pulley.

SST

09950–50012 (09951–05010, 09952–05010,
09953–05010, 09953–05020, 09954–05020)

NOTICE:
Do not turn the crankshaft pulley.
25.

REMOVE NO.1 TIMING BELT COVER

Remove the 4 bolts, timing belt cover.
26.

REMOVE TIMING BELT GUIDE

27.

REMOVE TIMING BELT COVER SPACER

28.

REMOVE TIMING BELT

HINT:
If re–using the belt and the installation mark has disappeared
from it, place a new installation mark on the timing belt to the
match the dot mark of the crankshaft timing pulley.
29.

REMOVE NO.2 IDLER PULLEY

Remove the bolt and idler pulley.

A03232

10 mm
Hexagon
Wrench

Plate Washer

A03233

SST

–

ENGINE MECHANICAL

TIMING BELT

EM–19

1201

30.

REMOVE NO.1 IDLER PULLEY

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

31.

REMOVE CRANKSHAFT TIMING PULLEY

Using SST, remove the timing pulley.

SST

09950–50012 (09951–05010, 09952–05010,
09953–05010, 09953–05020, 09954–05010)

NOTICE:
Do not turn the timing pulley.

EM09N–02

EM3336

NO !

P20079

P20633

EM–20

–

ENGINE MECHANICAL

TIMING BELT

1202

INSPECTION

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 re-
moving the mount bolt of the camshaft timing pulley.

If there are any defects, as shown in the illustrations, check
these 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 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 each pulley.

(e)

If there is noticeable wear on the belt teeth, check timing
cover for damage and check gasket has been installed
correctly and for foreign material on the pulley teeth.

If necessary, replace the timing belt.

2.

INSPECT IDLER PULLEYS

(a)

Visually check the seal portion of the idler pulley for oil
leakage.

If leakage is found, replace the idler pulley.
(b)

Check that the idler pulley turns smoothly.

If necessary, replace the idler pulley.

3.

INSPECT TIMING BELT TENSIONER

(a)

Visually check the seal portion of the tensioner for oil leak-
age.

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.

P20634

P20635

Protrusion

–

ENGINE MECHANICAL

TIMING BELT

EM–21

1203

(b)

Hold the tensioner with both hands and push the push rod
strongly as shown to check that it doesn’t move.

If the push rod moves, replace the tensioner.
NOTICE:
Never hold the tensioner push rod facing downward.

(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.
4.

INSPECT WATER PUMP (See page

CO–9

)