spark plugs replace INFINITI QX50 2023 Owners Manual

8 Do-it-yourself
Maintenance precautions........................8-2
Engine compartment check locations .............8-3
Engine cooling system .......................... 8-4
Checking engine coolant level .................8-5
Changing engine coolant ......................8-5
Engine oil ........................................8-6
Checking engine oil level .......................8-6
Changing engine oil and oil filter ...............8-7
Continuously Variable Transmission (CVT) fluid . . . 8-10
Brake fluid..................................... 8-10
Windshield-washer fluid ......................... 8-11
Windshield-washer fluid reservoir .............8-11
Battery ........................................ 8-12
Jump starting ............................... 8-14
Variable voltage control system ................8-14
Drive belt ...................................... 8-15
Spark plugs .................................... 8-15
Replacing spark plugs ....................... 8-15
Air cleaner ..................................... 8-16
In-cabin microfilter .......................... 8-17Windshield wiper blades
........................ 8-17
Cleaning .................................... 8-17
Replacing ................................... 8-17
Brakes ......................................... 8-19
Fuses .......................................... 8-20
Engine compartment ........................ 8-20
Passenger compartment ....................8-21
Battery replacement ........................... 8-22
INFINITI Intelligent Key .....................8-22
Lights ......................................... 8-24
Headlights .................................. 8-24
Fog lights (if so equipped) ...................8-24
Exterior and interior lights ...................8-25
Replacement procedures ....................8-26
Wheels and tires ............................... 8-27
Tire pressure ................................ 8-27
Tire labeling ................................ 8-32
Types of tires ............................... 8-35
Tire chains .................................. 8-38
Changing wheels and tires ...................8-38

1. Automatic tensioner pulley
2. Generator pulley
3. Water pump pulley
4. Air conditioner compressor pulley
5. Crankshaft pulley
WARNING
Be sure the ignition switch is in the OFF or
LOCK position before servicing drive belt.
The engine could rotate unexpectedly. 1. Visually inspect the belt for signs of un-
usual wear, cuts, or fraying. If the belt is
in poor condition, have it replaced. It is
recommended that you visit an INFINITI
retailer for this service.
2. Have the belt checked regularly for condition.
REPLACING SPARK PLUGS
Iridium-tipped spark plugs
It is not necessary to replace iridium-tipped
OAspark plugs as frequently as conventional
type spark plugs because they last much lon-
ger. Follow the maintenance log shown in the
"Maintenance and schedules" section of this
manual. Do not service iridium-tipped spark
plugs by cleaning or regapping.
• Always replace spark plugs with recom-
mended or equivalent ones.
WDI0638SDI1895
DRIVE BELT SPARK PLUGS
Do-it-yourself8-15

WARNING
Be sure the engine and ignition switch are
off and that the parking brake is engaged
securely.
CAUTION
Be sure to use the correct socket to remove
the spark plugs. An incorrect socket can
damage the spark plugs.
If replacement is required, it is recommended
that you visit an INFINITI retailer for this
service.
WARNING
• Operating the engine with the air cleaner
filter off can cause you or others to be
burned. The air cleaner filter not only
cleans the intake air, it also stops the
flame if the engine backfires. If the air
cleaner is not installed and the engine
backfires, you could be burned. Never
drive with the air cleaner filter off. Be
cautious working on the engine when the
air cleaner is off. •
Never pour fuel into the throttle body or
attempt to start the engine with the air
cleaner removed. Doing so could result in
serious injury.
To remove the filter from the air cleaner, push
the clips
OAand pull the cover upward.
The viscous paper type filter element should
not be cleaned and reused. Replace it accord-
ing to the maintenance log shown in the
“Maintenance and schedules” section of this
manual.
When replacing the air filter, wipe the inside
of the air cleaner housing and the cover with
a damp cloth.
NOTE:
After installing a new air cleaner filter,
make sure the air cleaner cover is seated in
the housing and latch the clips
OA.
LDI3165
AIR CLEANER
8-16Do-it-yourself

equivalent with the proper mixture. (For ad-
ditional information on the proper mixture for
your area, see “Engine cooling system”
(P. 8-4).)
NOTE: Mixing any other type of coolant or
the use of non-distilled water may reduce
the recommended service interval of the
coolant.
Engine oil and oil filter:Replace engine oil
and oil filter at the specified intervals. For
recommended oil grade and viscosity, see
“Recommended fluids/lubricants and capaci-
ties” (P. 10-2).
Engine valve clearance*: Inspect only if valve
noise increases. Adjust valve clearance if
necessary.
Evaporative emissions control vapor lines*:Check vapor lines for leaks or looseness.
Tighten connections or replace parts as
necessary.
Fuel lines/connections*: Check the fuel
hoses, piping and connections for leaks,
looseness, or deterioration. Tighten connec-
tions or replace parts as necessary.
Spark plugs: Replace at specified intervals.
Install new plugs of the same type as origi-
nally equipped.
CHASSIS AND BODY
MAINTENANCE:
Brake lines and cables: Visually inspect for
proper installation. Check for chafing, cracks,
deterioration, and signs of leaking. Replace
any deteriorated or damaged parts
immediately.
Brake pads and rotors: Check for wear, de-
terioration and fluid leaks. Replace any dete-
riorated or damaged parts immediately.
Exhaust system: Visually inspect the exhaust
pipes, muffler and hangers for leaks, cracks,
deterioration, and damage. Tighten connec-
tions or replace parts as necessary.
In-cabin microfilter: Replace at specified in-
tervals. When driving for prolonged periods in
dusty conditions, replace the filter more
frequently.
Propeller shaft(s): Check for damage, loose-
ness, and grease leakage. (AWD)
Steering gear and linkage, axle and suspen-
sion parts, drive shaft boots: Check for dam-
age, looseness, and leakage of oil or grease.
Under severe driving conditions, inspect more
frequently. Tire rotation:
Rotate tires at the specified
interval shown in the maintenance schedule.
When rotating tires, check for damage and
uneven wear. Replace if necessary.
Transmission fluid/oil, differential oil and
transfer case oil: Visually inspect for signs of
leakage at specified intervals.
Replace at specified intervals.
9-6Maintenance and schedules

Additional information
NOTE FOR ENGINE COOLANT *:
(1)
First replacement interval is 105,000
miles (168,000 km) or 84 months. After
first replacement, replace every 75,000
miles (120,000 km) or 60 months.
(2)Use only Genuine NISSAN Long Life
Antifreeze/Coolant (blue) or equivalent
with proper mixture ratio of 50% antifreeze
and 50% demineralized or distilled water.
Mixing any other type of coolant or the use
of non-distilled water may reduce the life
expectancy of the factory fill coolant.
*Maintenance items and intervals wit h“*”
are recommended by INFINITI for reliable
vehicle operation. The owner need not
perform such maintenance in order to
maintain the emission warranty or
manufacturer recall liability. Other
maintenance items and intervals are
required.
NOTE FOR SPARK PLUGS:
(1) Replace every 105,000 miles
(168,000 km)
(2) Replace spark plug when the plug gap
exceeds 0.045 in (1.25 mm) even if within
specified replacement mileage.
Maintenance and schedules9-25

Seat belt........................1-20
Childsafety ....................1-20
Infantsandsmallchildren ..........1-20
Injuredperson...................1-16
Largerchildren ..................1-21
Precautions on seat belt usage .......1-12
Pregnant women .................1-15
Seat belt extenders ...............1-19
Seat belt maintenance .............1-19
Seat belts ...................1-12,7-7
Three-pointtypewithretractor ......1-16
Seat ............................3-37
Memory seat ...............3-37,3-39
Seatback pockets ..................2-61
Seats/floormats....................7-6
Seats ............................1-2
Adjustment ......................1-2
Armrests........................1-5
Frontseats......................1-2
Heated seats ...................2-49
Rear bench seat ..................1-5
Security indicator light ...............2-13
Security system ...................2-34
(INFINITI vehicle immobilizer system),
engine start ............2-34,3-4,5-16
Security systems ...................2-33
Vehicle security system ............2-33
Self-adjusting brakes ................8-19
Service manual order form ...........10-37
Servicing air conditioner .............4-43
Spark plug replacement ..............8-15
Spark plugs .......................8-15
Specifications .....................10-9
Speedometer ......................2-4 SRS warning label
..................1-61
Stability control ...................5-142
Standard maintenance ...............9-9
Starting the engine .................5-16
Starting .........................5-16
Before starting the engine ..........5-16
Jump starting ...............6-5,8-14
Precautions when starting and
driving .....................5-4,5-10
Push starting ....................6-7
Starting the engine ...............5-16
Steering Assist switch (for vehicles with
ProPILOT Assist) ..................2-51
Steering wheel ....................3-31
Steering........................5-137 Power steering system ......5-137, 5-138
Stoplight........................8-25
Storagetray......................2-62
Storage .........................2-61
Sunvisors........................3-32
Sunglasses case ...................2-63
Sunglasses holder ..................2-63
Sunroof .........................2-75
Supplemental air bag warning labels .....1-61
Supplemental air bag warning light ......1-62
Supplemental front impact air bag
system..........................1-49
Supplemental restraint system
(Supplemental air bag system) .........1-41
Supplemental restraint system .........1-61
Information and warning labels ......1-61
Precautions on supplemental restraint
system ........................1-41 Switch
..........................2-40
Autolight switch .................
2-40
Automatic
power window switch .....2-74
Fog light switch .................2-47
Hazard warning flasher switch ........6-2
Headlight aiming control ...........2-45
Headlight and turn signal switch .....2-40
Instrument brightness control .......2-46
Power door lock switch .............3-5
Rear window wiper and washer
switches.......................2-38
Turn signal switch ................2-46
T
Tachometer.......................2-6
Temperature gauge ..................2-6
Engine coolant temperature gauge .....2-6
Theft ........................... 2-34
(INFINITI vehicle immobilizer system),
enginestart ............ 2-34, 3-4, 5-16
Three-way catalyst ..................5-4
Tire Pressure Monitoring System
(TPMS) ...........................5-5
Tirepressure......................2-14 Low tire pressure warning light ......2-14
Tire .............................6-3 Flat tire ........................6-3
Tire and Loading Information label . . .10-13
Tirechains.....................8-38
Tirepressure....................8-27
Tirerotation....................8-38
11-6