2003 Lexus GX470 engine

INTRODUCTION
405
Removing the engine compartment covers
Before checking the power steering fluid or fuses in the
engine compartment, remove the engine compartment
covers as follows:
61PY007
1
Turn the plastic nuts counterclockwise and remove them.
2
Push the core of the clips using a Phillips −head
screwdriver and remove the clips.
3
Remove the covers.
Be careful not to lose the removed plastic nuts and clips.
After checking the items, install the engine compartment
covers and insert the plastic nuts and clips in their original
positions.
When inserting the clips, do as shown above.
NOTICE
After installing the engine compartment covers, make
sure the covers are securely in their original positions.

INTRODUCTION
406
DOITYOURSELF SERVICEPRECAUTIONS
If you perform maintenance yourself, be sure to follow the
correct procedure given in this section.
You should be aware that improper or incomplete servicing
may result in operating problems.
Performing do −it−yourself maintenance during the warranty
period may affect your warranty coverage. Read the separate
Lexus Warranty statement for details and suggestions.
This Section gives instructions only for those items that are
relatively easy for an owner to perform. As explained in
Section 5, there are still a number of items that must be
performed by a qualified technician with special tools.
For information on tools and parts for do−it−yourself
maintenance, see “Parts and tools” on page 407.
Utmost care should be taken when working on your vehicle to
prevent accidental injury. Here are a few precautions that you
should be especially careful to observe:
CAUTION
 When the engine is running, keep hands, clothing,
and tools away from the moving fan and engine drive
belt. (Removing rings, watches, and ties is
advisable.)
 Right after driving, the engine compartment the
engine, radiator, exhaust manifold and power
steering fluid reservoir, etc. will be hot. So be
careful not to touch them. Oil, other fluids and spark
plugs may also be hot.
 If the engine is hot, do not remove the radiator cap or
loosen the drain plugs to prevent burning yourself.
 Do not smoke, cause sparks or allow open flames
around fuel or the battery. Their fumes are
flammable.
 Do not get under your vehicle with just the body jack
supporting it. Always use automotive jack stands or
other solid supports.
 Use eye protection whenever you work on or under
your vehicle where you may be exposed to flying or
falling material, fluid spray, etc.
 Be extremely cautious when working on the battery.
It contains poisonous and corrosive sulfuric acid.
 Warning: Battery posts, terminals and related
accessories contain lead and lead compounds,
chemicals known to the State of California to cause
cancer and reproductive harm. Wash hands after
handling.

INTRODUCTION
407
NOTICE
Remember that battery and ignition cables carry high
currents or voltages. Be careful of accidentally
causing a short circuit.
 Before closing the engine hood, check to see that you
have not forgotten any tools, rags, etc.
 Do not drive with the air cleaner removed, or
excessive engine wear could result. Also backfiring
could cause a fire in the engine compartment.
 Do not overfill automatic transmission fluid and
power steering fluid, or the transmission and power
steering could be damaged.
 Be careful not to scratch the glass surface with the
wiper frame.
PARTS AND TOOLS
Here is a list of parts and tools you will need to perform
do−it−yourself maintenance. Remember all Lexus parts are
designed in metric sizes, so your tools must be metric.
Checking the engine oil level
Parts (if level is low):
“Toyota Genuine Motor Oil” or equivalent
See page 420 for details about engine oil selection.
Tools:
 Rag or paper towel
 Funnel (only for adding oil)
Checking the engine coolant level
Parts (if level is low):
“Toyota Genuine Long Life Coolant” or equivalent
See “Checking the engine coolant level” on page 422 for
instructions.
 Demineralized or distilled water
Tools:
 Funnel (only for adding coolant)

SECTION 6 – 2
410
SERVICE PROCEDURES AND
SPECIFICATIONS
Engine
Specifications411
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . .
Fuel 414
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . \
. . . . . . . . . . . . . . . .
Fuel pump shut off system 416
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Facts about engine oil consumption 417
. . . . . . . . . . . . . . . . . . . . . . . .
Used engine oil 418
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . .
Checking the engine oil level 419
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the engine coolant level 422
. . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the radiator and condenser 423
. . . . . . . . . . . . . . . . . . . . . . .
Spark plugs 424
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .\
. . . . . . . .

ENGINE
411
SPECIFICATIONS
GENERALModel
2UZ−FE
Type8 cylinder V Type, 4 cycle, gasoline
Bore and stroke94.0 X 84.0 mm (3.70 X 3.31 in.)
Displacement4664 cm3 (284.6 cu.in.)
Valve clearance (engine cold) Intake
Exhaust0.15 − 0.25 mm (0.006 − 0.010 in.)
0.25 − 0.35 mm (0.010 − 0.014 in.)
Drive belt tensionAutomatic adjustment

62Z002
Outside temperature
ENGINE
412 LUBRICATION SYSTEM
Oil capacity Drain and refillwith filter
without filter
6.2 L (6.5 qt., 5.5 lmp.qt.)
5.7 L (6.0 qt., 5.0 lmp.qt.)
Oil gradeAPI grade SL “Energy− Conserving” or ILSAC multigrade engine oil
Recommended oil viscosity (SAE):
NOTE:
“Toyota Genuine Motor Oil” is filled in your Lexus vehicle. Use Lexus approv\
ed “Toyota Genuine Motor Oil” or equivalent to sat isfy
the above grade and viscosity. Please contact your Lexus dealer for further details.

ENGINE
413
COOLING SYSTEM
Capacity
12.9 L (13.6 qt., 11.4 lmp.qt.)
Coolant type“Toyota Genuine Long Life Coolant” or equivalent
With ethylene− glycol type coolant for a proper corrosion
protection of aluminum components
Do not use alcohol type antifreeze or plain water alone.
NOTE:
“Toyota Genuine Long Life Coolant” is filled in your Lexus vehicle. In\
order to avoid technical problems, we strongly recommen d
using “Toyota Genuine Long Life Coolant” or equivalent. Please contact your \
Lexus dealer for further details.
FUEL
Fuel type
Only UNLEADED
Octane rating87 (Research octane number 91) or higher
IGNITION SYSTEMSpark plug − Make
DENSO
NGK
− Gap
SK20R11
IFR6A11
1.1 mm (0.043 in.)
ELECTRICAL SYSTEM
Battery Open voltage at 20C (68F):
Charging rates
12.6 − 12.8 V Fully charged
12.2 − 12.4 V Half charged
11.8 − 12.0 V Discharged
[Voltage that is checked 20 minutes after the key is removed
with all the lights turned off]
5A max.

ENGINE
414
FUEL
Fuel type
Your vehicle must use only unleaded gasoline.
To help prevent gas station mixups, your Lexus has a smaller
fuel tank opening. The special nozzle on pumps with unleaded
fuel will fit it, but the larger standard nozzle on pumps with
leaded gas will not.
At a minimum, the gasoline you use should meet the
specifications of ASTM D4814 in the U.S.A. and CGSB
3.5−M93 in Canada.
NOTICE
Do not use leaded gasoline. Use of leaded gasoline will
cause the threeway catalytic converter to lose its
effectiveness and the emission control system to
function improperly. Also, this can increase
maintenance costs.
Octane rating
Select Octane Rating 87 (Research Octane Number 91) or
higher. For improved vehicle performance, the use of
premium unleaded gasoline with an Octane Rating of 91
(Research Octane Number 96) or higher is recommended. Use of unleaded fuel with an octane number or rating lower
than stated above will cause persistent heavy knocking. If
severe, this will lead to engine damage.
If your engine knocks ...
If you detect heavy knocking even when using the
recommended fuel, or if you hear steady knocking while
holding a steady speed on level roads, consult your Lexus
dealer.
However, occasionally, you may notice light knocking for a
short
time while accelerating or driving up hills. This is normal
and there is no need for concern.
Gasoline containing detergent additives
Lexus recommends the use of gasoline that contains
detergent additives to avoid buildup of engine deposits.
However, all gasoline sold in the U.S. contains detergent
additives to keep clean and/or clean intake systems.
Quality gasoline
Automotive manufacturers in the U.S., Europe and Japan
have developed a specification for quality fuel named
WorldWide Fuel Charter (WWFC) that is expected to be
applied world wide. The WWFC consists of three
categories t hat depend on required emission levels. In the
U.S., category 3 has been adopted. The WWFC improves
air quality by providing for better emissions in vehicle
fleets, and customer satisfaction through better vehicle
performance.