Lexus SC300 / Lexus SC400. Manual — part 540

5. REPLACE

SPARK

PLUGS

(See Ignition System, steps 1 to 8 on pages

IG–16

to 18)

(a) Remove the No.3 timing belt covers.

(b) Disconnect

the high–tension cords at the rubber boot. Do not

pull on the high–tension cords.
NOTICE: Pulling on or bending the cords may damage
the conductor inside.

(c) Using a 16 mm plug wrench, remove the 8 spark plugs.

(d) Check the electrode gap of new spark plugs.

Correct electrode gap:

1.1 mm (0.043 in.)

Recommended spark plug:

PK20R11 for ND

BKR6EP11 for NGK

NOTICE: If adjusting the gap of a new spark plug, bend
only the base of the ground electrode. Do not touch the
tip.

(e) Using a 16 mm plug wrench, reinstall the 8 spark plugs.

Torque: 18 N

⋅

m (180 kgf

⋅

cm, 13 ft

⋅

lbf)

(f) Reconnect the high–tension cords.
(g) Reinstall the No.3 timing belt covers.

(See Ignition System, steps 5 to 13 on pages

IG–22

to 24)

MA–8

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MAINTENANCE

(1UZ – FE)

6.

REPLACE ENGINE OIL AND OIL FILTER
(See Lubrication System on page

EG–497

)

Oil grade:

API grade SG or SH, Energy–Conserving II or ILSAC

multigrade engine oil. Recommended viscosity is as

shown in the illustration, with SAE 5W–30 being the

preferred engine oil.

Drain and refill capacity:

w/ Oil filter change

4.8 liters (5.1 US qts, 4.2 lmp. qts)

w/o Oil filter change

4.5 liters (4.8 US qts, 4.0 lmp. qts)

7.

REPLACE ENGINE COOLANT
(See Cooling System on page

EG–425

)

Coolant capacity (w/ Heater):

10.8 liters (11.4 US qts, 9.5 lmp. qts)

HINT:

•

Use a good brand of ethylene–glycol base coolant and
mix it according to the manufacturer’s directions.

•

Using coolant which includes more than 50 %
ethylene–glycol (but not more than 70 %) is
recommended.

NOTICE:

•

Do not use a alcohol type coolant.

•

The coolant should be mixed with demineralized water or

distilled water.

8.

INSPECT CHARCOAL CANISTER

(a) Remove the charcoal canister.

(See Emission Control System on page

EG–221

)

(b) Visually inspect the canister case.
(c) Check for crogged each port and stuck check valve.

•

Using low compressed air (4.71 kPa (48 gf/cm

2

, 0.68

psi)), blow into port A and check that air flows without
resistance from the other ports.

•

Blow low compressed air (4.71 kPa (48 gf/cm

2

, 0.68

psi)) into port B and check that air does not flow from the
other ports.

If operation is not as specified, replace the charcoal canister.

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MAINTENANCE

(1UZ – FE)

MA–9

(d) Clean the filter in the canister.

Clean the filter by blowing 294 kPa (3 kgf/cm

2

, 43 psi) of com-

pressed air into port A while holding port B closed.
NOTICE:

•

Do not attempt to wash the canister.

•

No activated carbon should come out.

(e) Reinstall the charcoal canister.

(See Emission Control System on page

EG–222

)

9.

REPLACE GASKET IN FUEL TANK CAP

(a) Remove

the old gasket from the tank cap. Do not damage the

cap.

(b) Install a new gasket by hand.
(c) Check the cap for damage or cracks.
(d) Install the cap and check the torque limiter.

10. INSPECT FUEL LINES AND CONNECTIONS

Visually check the fuel lines for cracks, leakage, loose con-
nections, deformation or tank band looseness.

11. INSPECT EXHAUST PIPES AND MOUNTINGS

Visually check the pipes, hangers and connections for se-
vere corrosion, leaks or damage.

12. ADJUST

VALVE

CLEARANCE

(See Engine Mechanical on page

EG–14

)

Valve clearance (Cold):

Intake

.15 – 0.25 mm (0.006 – 0.010 in.)

Exhaust

.25 – 0.35 mm (0.010 – 0.014 in.)

MA–10

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MAINTENANCE

(1UZ – FE)

MA04N–01

BRAKES

13. INSPECT BRAKE LINE PIPES AND HOSES

HINT: Check in a well lighted area. Check the entire circum-
ference and length of the brake hoses using a mirror as re-
quired. Turn the front wheels fully right or left before checking
the front brake.

(a) Check all brake lines and hoses for:

•

Damage

•

Wear

•

Deformation

•

Cracks

•

Corrosion

•

Leaks

•

Bends

•

Twists

(b) Check all clamps for tightness and connections for leakage.
(c) Check that the hoses and lines are clear of sharp edges,

moving parts and the exhaust system.

(d) Check that the lines installed in grommets pass through the

center of the grommets.

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MAINTENANCE

(1UZ – FE)

MA–11