Lexus SC300 / Lexus SC400. Manual — part 347

TUNE–UP

EG10Z–05

ENGINE COOLANT INSPECTION

1. CHECK

ENGINE COOLANT LEVEL AT RESERVOIR TANK

The coolant level should be above the “COLD LEVEL” at nor-
mal temperature (20

°

C (68

°

F)).

If low, check for leaks and add coolant up to the “COLD LEV-
EL”

2.

CHECK ENGINE COOLANT QUALITY

(a) Remove the radiator cap from the reservoir tank.

CAUTION: To avoid the danger of being burned, do not remove

it while the engine and radiator are still hot as fluid and steam

can be blown out under pressure

(b) There should not be any excessive deposits of rust or scale

around the radiator cap or reservoir tank filler hole, and the
coolant should be free from oil.
If excessively dirty, clean the coolant passages and replace
the 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.

(c) Reinstall the radiator cap.

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1UZ–FE ENGINE

ENGINE MECHANICAL

EG–9

EG0B4–0K

ENGINE OIL INSPECTION

1.

CHECK OIL QUALITY
Check the oil for deterioration, entry of water, discoloring or
thinning.
If oil quality is visibly poor, replace the oil.

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)

2.

CHECK ENGINE OIL LEVEL
The oil level should be between the “L” and “F” marks on the
dipstick.
If low, check for leakage and add oil up to the “F” mark.

EG3E2–01

BATTERY INSPECTION

1.

CHECK BATTERY ELECTROYTE LEVEL AND VOLTAGE

(a) Check the electrolyte quantity of each cell.

If under the lower level, replace the battery (or add distilled
water if possible.). Need to check the charging system.

(b) Measure the battery voltage between the terminals negative

(–) and positive (+) of the battery.

Standard voltage:

12.7–12.9 V at 20

°

C (68

°

F)

HINT:

•

Before measuring the voltage, turn the ignition switch
OFF and turn off the electrical systems (headlight,
blower motor, rear defogger etc.) for 60 seconds to
remove the surface charge.

EG–10

–

1UZ–FE ENGINE

ENGINE MECHANICAL

•

If the vehicle has been running, wait 5 minutes or more
after the vehicle stops before measuring the battery
voltage.

If the voltage is less than specification, charge the battery.

HINT: Check the indicator as shown in the illustration.

1. CHECK BATTERY SPECIFIC GRAVITY AND

ELECTROLYTE LEVEL

2.

CHECK BATTERY TERMINALS AND FUSES

(a) Check that the battery terminals are not loose or corroded.
(b) Check the fuses for continuity.

EG3F9–01

AIR FILTER INSPECTION AND
CLEANING

1.

REMOVE AIR FILTER

(a) Open the air cleaner cap.

(b) Remove the air filter.

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1UZ–FE ENGINE

ENGINE MECHANICAL

EG–11

2.

INSPECT AND CLEAN AIR FILTER

(a) Visually check that the air filter is not excessively damaged

or only.
If necessary, replace the air filter.

(b) Clean the air filter with compressed air.

First blow from the inside thoroughly, then blow off the out-
side of the air filter.

3.

REINSTALL AIR FILTER

EG1KB–02

HIGH–TENSION CORDS INSPECTION

1.

REMOVE NO.3 TIMING BELT COVERS
(See steps 10 to 14 on pages

EG–16

)

2.

REMOVE HIGH–TENSION CORDS
(See step 1 on page

IG–16

)

NOTICE: Pulling on or bending the cords may damage the con-

ductor inside.

3.

INSPECT HIGH–TENSION CORD RESISTANCE
Using an ohmmeter, measure the resistance.

Maximum resistance:

25 k

per cord

If the resistance is greater than maximum, replace the cord.

4.

REINSTALL HIGT–TENSION CORDS
(See step 1 on page

IG–19

)

5.

REINSTALL NO.3 TIMING BELT COVERS
(See steps 28 to 30 on pages

EG–29

)

EG–12

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1UZ–FE ENGINE

ENGINE MECHANICAL