Lexus LS400 (2000 year). Service manual — part 88

EM–6

–

ENGINE MECHANICAL

VALVE CLEARANCE

1188

Intake:
N = T + (A – 0.20 mm (0.008 in.))
Exhaust:
N = T + (A – 0.30 mm (0.012 in.))

Select a new shim with a thickness as close as pos-
sible to the calculated value.

HINT:
Shims are available in 41 increments of 0.020 mm (0.0008 in.),
from 2.00 mm (0.0787 in.) to 2.80 mm (0.1102 in.).
(e)

Place a new adjusting shim on the valve.

(f)

Place the valve lifter.

(g)

Reinstall the camshafts. (See page

EM–58

)

(h)

Reinstall the timing belt. (See page

EM–22

)

(i)

Recheck the valve clearance.

13.

REINSTALL CYLINDER HEAD COVERS

14.

REINSTALL IGNITION COILS

15.

REINSTALL NO.3 TIMING BELT COVERS
(See page

EM–22

)

16.

REINSTALL AIR CLEANER AND INTAKE AIR CON-
NECTOR ASSEMBLY

17.

REFILL WITH ENGINE COOLANT

18.

START ENGINE AND CHECK FOR LEAKS

19.

RECHECK ENGINE COOLANT LEVEL

20.

REINSTALL V–BANK COVER

21.

REINSTALL AIR CLEANER INLET

22.

REINSTALL BATTERY CLAMP COVER

A031

1

1

Adjusting Shim Selection Chart (Intake)

Shim No.

Installed shim thickness

mm (in.)

mm (in.)

Measured clearance

Thickness

New shim thickness

Shim No.

Thickness

Shim No.

Thickness

mm (in.)

Intake valve clearance (Cold):
0.15 – 0.25 mm (0.006 – 0.010 in.)

EXAMPLE:
The 2.300 mm (0.0906 in.) shim is installed,
and the measured clearance is 0.440 mm
(0.0173 in.). Replace the 2.300 mm (0.0906
in.) shim with a No. 54 shim.

–

ENGINE MECHANICAL

V

A

L

VE CLEARANCE

EM–7

1

189

2000

A031

12

Adjusting Shim Selection Chart (Exhaust)

Installed shim thickness

mm (in.)

mm (in.)

Measured clearance

Shim No.

Thickness

New shim thickness

Shim No.

Thickness

Shim No.

Thickness

mm (in.)

Exhaust valve clearance (Cold):
0.25 – 0.35 mm (0.010 – 0.014 in.)

EXAMPLE:
The 2.300 mm (0.0906 in.) shim is installed,
and the measured clearance is 0.440 mm
(0.0173 in.). Replace the 2.300 mm (0.0906
in.) shim with a No. 44 shim.

EM–8

–

ENGINE MECHANICAL

V

A

L

VE CLEARANCE

1

190

2000

EM09R–02

A03191

SST

A03192

–

ENGINE MECHANICAL

CYLINDER HEAD

EM–43

1225

DISASSEMBLY

1.

REMOVE VALVE LIFTERS AND SHIMS

HINT:
Arrange the valve lifters and shims in correct order.

2.

REMOVE VALVES

(a)

Using SST, compress the valve spring and remove the 2
keepers.
SST

09202–70020

(b)

Remove the spring retainer.

(c)

Remove the valve spring.

(d)

Remove the valve.

(e)

Remove the spring seat.

HINT:
Arrange the valves, valve springs, spring seats and spring re-
tainers incorrect order.

(f)

Using needle–nose pliers, remove the oil seal.