Page 545 of 641

INTRODUCTION
528
DO-IT-YOURSELF SERVICE
PRECAUTIONS
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 toolsº on page 530.
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 Ð the
engine, radiator, exhaust manifold and power
steering fluid reservoir, etc. Ð 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 leave anything that may burn easily, such as
paper or rags, in the engine compartment.
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.
Page 550 of 641
ENGINE
533
SPECIFICATIONS
Ð GENERAL
Model
2UZ-FE
Type8 cylinder V Type, 4 cycle, gasoline
Bore and stroke94.0 84.0 mm (3.70 3.31 in.)
Displacement4664 cm3 (284.6 cu.in.)
Valve clearance (engine cold)
Intake
Exhaust0.15 Ð 0.25 mm (0.006 Ð 0.010 in.)
0.25 Ð 0.35 mm (0.010 Ð 0.014 in.)
Drive belt tensionAutomatic adjustment
Page 581 of 641
CHASSIS
564
1Section width
2Tire height
3Wheel diameter
Name of each section of tire
1Bead
2Sidewall
3Shoulder
4Tread
5Belt
6Inner liner
7Reinforcing rubber
8Carcass
9Rim lines
10Bead wires
11Chafer
Page 589 of 641

CHASSIS
572
Tire selection
When replacing a tire, use a tire of the same size
and construction, and the same or greater load
capacity as the originally installed tires. Also, all
the tires must be the same brand and have the
same tread patterns.
Using any other size or type of tire may seriously
affect handling, ride, speedometer/odometer
calibration, ground clearance, and clearance between
the body and tires or snow chains.
Check that the maximum load of the replaced tire is
greater than 1/2 of the Gross Axle Weight Ratings
(GAWR) of either the front axle or the rear axle,
whichever is greater. As for the maximum load of
the tire, see the load limit at maximum cold tire
inflation pressure mentioned on the sidewall of the tire,
and as for the Gross Axle Weight Ratings (GAWR),
see the Certification Label. For details about
Certification Label and sidewall of the tire, see pages
522 and 561.CAUTION
Observe the following instructions. Otherwise,
an accident may occur resulting in death or
serious injuries.
Do not mix radial, bias belted, or bias-ply tires
on your vehicle, as this may cause dangerous
handling characteristics resulting in loss of
control.
Do not use tires other than the manufacturer's
recommended size, as this may cause
dangerous handling characteristics resulting
in loss of control.
Do not use tires of different brands, sizes,
construction or tread patterns, as this may
cause dangerous handling characteristics
resulting in loss of control.
Page 631 of 641

BODY
614
Carpets, Windows and Seat Belts
Begin by vacuuming thoroughly to remove as much dirt as
possible. Several types of foam cleaners are available; some
are in aerosol cans and others are powders or liquids which
you mix with water to produce a foam. To shampoo the
carpets, use a sponge or brush to apply the foam. Rub in
overlapping circles. Do not apply water Ð the best results are
obtained by keeping the carpet as dry as possible. Read the
shampoo instructions and follow them closely.The seat belts may be cleaned with mild soap and water or
with lukewarm water.
Use a cloth or sponge. As you are cleaning, check the belts for
excessive wear, fraying or cuts.
NOTICE
Use a good foam-type shampoo to clean the carpets.
Do not use dye or bleach on the belts Ð it may
weaken them.
Do not use the belts until they become dry.
The windows may be cleaned with any household
window cleaner.
Do not apply detergent to or wet the automatic wiper
control sensor when cleaning the inside of the
windshield.
When cleaning the inside of the quarter and rear
windows, be careful not to scratch or damage the
wire antennas, heater wires or connectors.
Page 638 of 641
WE REALLY CARE ABOUT YOU - PLEASE BUCKLE UP
Lexus has made a special effort to encourage use of seat belts.
Lexus belts are:
Comfortable
Easy to use
Convenient
We encourage you to use your belts every time you drive.
2004 GX470 from Nov. '03 Prod. (OM60A74U)