Lexus RX300 (MCU15). Manual — part 431

V00719

Adjusting shim selection chart (Intake)

Intake valve clearance (Cold):

0.15 – 0.25 mm (0.006 – 0.010 in.)

EXAMPLE: The 2.800 mm (0.1102 in.) shim is installed, and
the measured clearance is 0.450 mm (0.0177 in.).
Replace the 2.800 mm (0.1102 in.) shim with a new No.12
shim.

New shim thickness mm (in.)

Thickness

Thickness

Shim

No.

Shim

No.

ters imprinted on the face.

HINT: New shims have the thickness in millime–

Installed shim thickness

Measured clearance

mm (in.)

mm (in.)

EM–8

–

ENGINE MECHANICAL

V

AL
VE CLEARANCE

LEXUS

RX300 (RM785E)

V00720

Adjusting shim selection chart (Exhaust)

Exhaust valve clearance (Cold):

0.25 – 0.35 mm (0.010 – 0.014 in.)

EXAMPLE: The 2.800 mm (0.1102 in.) shim is installed, and
the measured clearance is 0.450 mm (0.0177 in.).
Replace the 2.800 mm (0.1102 in.) shim with a new No.10
shim.

New shim thickness mm (in.)

Thickness

Thickness

Shim

No.

Shim

No.

ters imprinted on the face.

HINT: New shims have the thickness in millime–

Installed shim thickness

Measured clearance

mm (in.)

mm (in.)

–

ENGINE MECHANICAL

V

AL
VE CLEARANCE

EM–9

LEXUS

RX300 (RM785E)

A05071

EM0KH–02

D09456

A05417

Lead Wire

A05186

E1

TE1

Check Connector

SST

Check Connector

A05184

EM–10

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ENGINE MECHANICAL

IGNITION TIMING

LEXUS RX300 (RM785E)

IGNITION TIMING

INSPECTION

1.

REMOVE V–BANK COVER

(a)

Using a 5 mm hexagon wrench, remove the 3 nuts.

(b)

Remove the V–bank cover fastener clip and V–bank cov-
er.

2.

WARM UP ENGINE

Allow the engine to warm up to normal operating temperature.

3.

CONNECT HAND–HELD TESTER

(a)

Connect the hand–held tester to the DLC3.

(b)

Please refer to the hand–held tester operator’s manual
for further details.

4.

CONNECT TIMING LIGHT TO ENGINE

Connect the tester probe of a timing light to the lead wire as
shown.
5.

CHECK IDLE SPEED

(a)

Race the engine speed at 2,500 rpm for approx. 90 se-
conds.

(b)

Check the idle speed.
Idle speed: 700 ± 50 rpm

6.

INSPECT IGNITION TIMING

(a)

Using SST, connect terminals TE1 and E1 of the check
connector.
SST

09843–18020

(b)

Using a timing light, check the ignition timing.
Ignition timing: 8 – 12° BTDC @ idle
(Transmission in neutral range)

(c)

Remove the SST from the check connector.
SST

09843–18020

7.

FURTHER CHECK IGNITION TIMING
Ignition timing: 10 – 25° BTDC @ idle
(Transmission in neutral range)

HINT:
The timing mark moves in a range between 10

° and 25°.

–

ENGINE MECHANICAL

IGNITION TIMING

EM–11

LEXUS RX300 (RM785E)

8.

DISCONNECT TIMING LIGHT FROM ENGINE

9.

DISCONNECT HAND–HELD TESTER

10.

REINSTALL V–BANK COVER