Lexus SC300 / Lexus SC400. Manual - part 416

EM–16

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ENGINE MECHANICAL

Engine Tune–Up

13.  REINSTALL NO. 3, NO. 1 AND NO. 2 CYLINDER HEAD

COVERS
(a)  Remove any oil packing (FIPG) material.
(b)  Apply seal packing to the cylinder head as shown in the

illustration.

Seal packing: Part No. 08826–00080 or equivalent

(c)  Install the gaskets to the No. 1 and No. 2 cylinder head

covers.

(d)  Install the cylinder head cover with the 12 bolts and four

nuts.

Torque: 5.4 N

⋅

m (55 kgf

⋅

cm, 48 in.

⋅

lbf)

14. RECONNECT HIGH–TENSION CORDS TO SPARK

PLUGS
(a)  Connect the high–tension cord to the spark plug.
HINT: The No. 4 high–tension cord must be raised 10

°

 from

the perpendicular line.

(b)  Connect the two high–tension cord clamps to the No. 3

cylinder head cover.

(c)  Install the high–tension cord clamp with the bolt.

15.  REINSTALL CYLINDER HEAD REAR COVER AND NO. 3

TIMING BELT COVER
(a)  Using a 5 mm hexagon wrench, install the cylinder head

rear cover and No. 3 timing belt cover with the ten bolts.

(b)  Install the oil filler cap.

–

ENGINE MECHANICAL

Engine Tune–Up

EM–17

16. REINSTALL THROTTLE BODY WITH INTAKE AIR

CONNECTOR
(a)  Place a new gasket so the protrusion face the intake

chamber, and set the throttle body with intake air
connector.

(b)  Connect the two water by–pass hoses to the throttle

body.

(c)  Install the VSV nut.
(d) Install 

the air intake connector with the four bolts and two

nuts.

Torque: 21 N

⋅

m (210 kgf

⋅

cm, 15 ft

⋅

lbf)

(e)  Connect the following hoses and connectors:

(1) PCV hose
(2) Three vacuum hoses
(3) VSV (for EGR) connector
(4) Throttle position sensor connector
(5) IAC valve connector
(6) (w/ TRAC)

Sub–throttle position sensor connector

(7) (w/ TRAC)

Sub–throttle actuator connector

(8) (USA spec. only)

EGR gas temperature sensor connector

17.  REINSTALL THROTTLE BODY BRACKET

Install the throttle body bracket with the four nuts.

Torque: 21 N

⋅

m (210 kgf

⋅

cm, 15 ft

⋅

lbf)

18.  REINSTALL EGR PIPE

(a) Install 

a 

new gasket and the EGR pipe with the two bolts.

Torque: 21 N

⋅

m (210 kgf

⋅

cm, 15 ft

⋅

lbf)

(b)  Tighten the union nut.

Torque: 64 N

⋅

m (650 kgf

⋅

cm, 47 ft

⋅

lbf)

EM–18

–

ENGINE MECHANICAL

Engine Tune–Up

19.  REINSTALL AIR CLEANER HOSE

(a)  Install the air cleaner hose with two hose clamps.
(b)  Connect the following hoses:

(1) PS air hose to No. 4 timing belt cover
(2) PCV hose to No. 2 cylinder head cover

20.  RECONNECT CONTROL CABLES TO THROTTLE BODY

Connect the following hoses:

(1) Accelerator cable
(2) (A/T)

Throttle control cable

(3) Cruise control actuator cable

21. RECONNECT CABLE TO NEGATIVE TERMINAL OF

BATTERY

INSPECTION OF IGNITION TIMING

(See page IG–14)

Ignition timing:

10

°

 BTDC @ idle

(w/ Terminals TE1 and E1 connected)

INSPECTION OF IDLE SPEED

HINT: Initial conditions (See step 1 on page EM–20)

Idle speed:

M/T 700 

±

 50 rpm

A/T 650 

±

 50 rpm (N range)

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ENGINE MECHANICAL

Engine Tune–Up

EM–19