maintenance LEXUS SC400 1991 Service User Guide

PREPARATION
EG0AZ±0A
RECOMMENDED TOOLS
MA009±02
EQUIPMENT
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Dial indicator with magnetic base 


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Micrometer
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MirrorBrake hose
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Steel square
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Thermometer
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Torque wrench
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Vernier calipers
MA00B±02
COOLANT 
Item
 
Capacity
 
Classification 

Engine coolant (w/ Heater)10.8 liters (11.4 US qts, 9.5 lmp. qts)Ethylene±glycol base
MA00D±0E
LUBRICANT
 Item Capacity Classification 

Engine oil (Drain and refill)
w/ Oil filter change
/ Oil filt h
 

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

API grade SG or SH, Energy±Conserving II
or ILSAC multigrade, and recommended
 


g
w/o Oil filter change 


4.8 liters (5.1 US qts, 4.2 lm. qts)
4.5 liters (4.8 US qts, 4.0 lmp. qts) 


or ILSAC multigrade, and recommended
viscosity oil with SAE 5W±30 being pre-
ferred engine oil
 Brake fluid Ð SAE J1703 or FMVSS No.116 DOT3
 Automatic transmission fluid 1.9 liters (2.0 US qts, 1.7 lmp. qts) ATF TYPE T±II

Automatic transmission fluid
(Drain and refill)
1.9 liters (2.0 US qts, 1.7 lm . qts)

AT F TYPE TII
 




Differential oil 




1.35 liters (1.43 US qts, 1.19 lmp. qts) 




Hypoid gear oil API GL±5
Above±18
5C (0 5F): SAE 90
Below±18 5C (0 5F): SAE 80W±90 or 80W
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MAINTENANCE (1UZ ± FE)MA±5
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MAINTENANCE OPERATIONS
MA035±04
ENGINE
Cold Engine Operations
1. REPLACE TIMING BELT
(a) Remove the timing belt.(See page EG±46)
(b) Install the timing belt. (See page EG±59)
2. INSPECT DRIVE BELT HINT: A belt tensioner is used, so checking the belt tension
is not necessary.
(a) Visually check the drive belt for excessive wear, frayed cords,
etc.
If necessary, replace the drive belt.
HINT:
w Cracks on the rib side of a drive belt are considered
acceptable. If the drive belt has chunks missing from the
ribs, it should be replaced.
w The drive belt tension can be released by turning the
belt tensioner counterclockwise. The pulley bolt for the
belt tensioner has a left±hand thread.
(b) Check the belt tensioner operation. wCheck that the belt tensioner moves downward when
the drive belt is pressed down at the points indicated in
the illustration with approx. 98 N (10 kgf, 22.0 lbf) of
force.
w Check the ali gnment of the belt tensioner pulley to make
sure the drive belt will not slip off the pulley.
If necessary, replace the belt tensioner.
w Check that the arrow mark on the belt tensioner falls
within area A of the scale.
If it is outside area A, replace the drive belt.
HINT:
w When a new belt is installed, it should lie within area B.
If not, the drive belt is not correct.
MA±6
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wAfter installing a drive belt, check that it fits properly in
the ribbed grooves.
w Check by hand to confirm that the belt has not slipped
out of the groove on the bottom of the pulley.
3. INSPECT AIR FILTER
(a) Open the air cleaner cap.
(b) Remove the air filter.
(c) Visually check that the air filter is not excessively damaged or oily.
If necessary, replace the air filter.
(d) Clean the air filter with compressed air. First blow from the inside thoroughly, then blow off from the
outside of the air filter.
(e) Reinstall the air filter and air cleaner cap.
4. REPLACE AIR FILTER Replace the air filter with a new one.
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MAINTENANCE (1UZ ± FE)MA±7
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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 Vm (180 kgf Vcm, 13 ft Vlbf)
(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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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:
wUse a good brand of ethylene±glycol base coolant and
mix it according to the manufacturer's directions.
w Using coolant which includes more than 50 %
ethylene±glycol (but not more than 70 %) is
recommended.
NOTICE:
w Do not use a alcohol type coolant.
w 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. wUsing 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.
w 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
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(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:
w Do not attempt to wash the canister.
w 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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MA04N±01
BRAKES
13. INSPECT BRAKE LINE PIPES AND HOSESHINT: 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 whe els fully right or left before checking
the front brake.
(a) Check all brake lines and hoses for: wDamage
w Wear
w Deformation
w Cracks
w Corrosion
w Leaks
w Bends
w 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
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14. INSPECT BRAKE PADS AND DISCS FOR FRONT ANDREAR
(a) Check the thickness of the disc brake pads and check for irregular wear.
Minimum pad thickness:
1.0 mm (0.039 in.)
HINT: If a squealing or scraping noise comes from the brake
during driving, check the pad wear indicator to see if it is con-
tacting the disc rotor. If so, the disc pad should be replaced.
(b) Check the disc for wear or runout.
Minimum disc thickness: Front
30.0 mm (1.181 in.)
Rear
15.0 mm (0.591 in.)
(c) Check the disc for runout.
Maximum disc runout: 0.05 mm (0.0020 in.)
15. INSPECT BRAKE LININGS AND DRUMS FOR PARKINGBRAKE
(a) Check the lining±to±drum contact condition and lining wear.
Minimum lining thickness:
1.0 mm (0.039 in.)
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(b) Check the brake drums for scoring or wear.
Maximum drum inside diameter:191 mm (7.520 in.)
(c) Clean the brake parts with a damp cloth.NOTICE: Do not use compressed air to clean the brake
parts.
(d) Seat the parking brake shoes during the road test (item 25) in do the following:
wDrive the vehicle at approx. 50 km/h (30 mph) on a safe,
level and dry road.
w With the parking brake release buttom pushed in, pull on
the lever with 88 N (9 kgf, 20 lbf) of force.
w Drive the vehicle for approx. 400 meters (1/4 mile) in this
condition.
w Repeat this procedure 2 or 3 times.
w Check parking pedal travel.
If necessary, adjust the parking brake.
16. INSPECT AND CHANGE BRAKE FLUID
(a) Visually inspect the master cylinder for leaks.
(b) Change brake fluid (See BR section)
Fluid: SAE J1703 or FMVSS No.116 DOT3
MA04F±01
CHASSIS
17. INSPECT STEERING LINKAGE
(a) Check the steering wheel freeplay.
Maximum freeplay:30 mm (1.18 in.)
With the vehicle stopped and pointed straight ahead, rock the
steering wheel gently back and forth with light finger pres-
sure.
(b) Check the steering linkage for looseness or damage. Check that:
wTie rod ends do not have excessive play.
w Dust seals and boots are not damaged.
w Boot clamps are not loose.
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MAINTENANCE (1UZ ± FE)MA±13
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18. INSPECT SRS AIRBAGDriver Airbag:
Visually inspect the steering wheel pad (airbag and inflater).
wUse the diagnosis check to check if there are
abnormalities.
w Check that there are no cuts, cracks or noticeable color
changes on the surface of the steering wheel pad or in
the center groove of the pad.
w Remove the steering wheel pad from the vehicle and
check the wiring and steering wheel for damage and
corrosion due to rusting, etc.
If necessary, replace the steering wheel pad.
Front Passenger Airbag:
Visually inspect the front passenger airbag assembly (airbag
and inflater).
w Use the diagnosis check to check if there are
abnormalities.
w Check that there are no cuts, cracks or noticeable color
changes in the front passenger airbag door.
w Remove the front passenger airbag assembly from the
vehicle and check the wiring and front passenger airbag
door for damage and corrosion due to rusting, etc.
If necessary, replace the front passenger airbag assembly.
CAUTION:
w For removal and replacement of the steering wheel pad
or front passenger airbag assembly, see page RS±28 and
be sure to perform the operation in the correct order.
w Before disposing of the steering wheel pad or front
passenger airbag assembly must first be deployed by
using SST and wiring harness connector (See page
RS±28 ).
19. INSPECT STEERING GEAR HOUSING OIL
Check the steering gear housing for oil leakage.
MA±14
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