2001 INFINITI QX4 cooling

Symptom Check items
Except cool-
ing system
parts mal-
functionÐ Overload on engineAbusive drivingHigh engine rpm under
no load
Driving in low gear for
extended time
Driving at extremely high
speed
Powertrain system malfunc-
tion
Ð Installed improper size
wheels and tires
Dragging brakes
Improper ignition timing
Blocked or restricted air
flowBlocked bumper Ð
Ð Blocked radiator grilleInstalled car brassiere
Mud contamination or
paper clogging
Blocked radiator Ð
Blocked condenser
Ð
Installed large fog lamp
Service Data and Specifications (SDS)
THERMOSTATNBLC0030
Valve opening temperature76.5ÉC (170ÉF)
Valve liftMore than 8.6 mm/90ÉC (0.339 in/194ÉF)
WATER CONTROL VALVENBLC0035
Valve opening temperature95ÉC (203ÉF)
Valve liftMore than 8.0 mm/108ÉC (0.315 in/226ÉF)
RADIATORNBLC0031Unit: kPa (kg/cm2, psi)
Cap relief pressureStandard 78 - 98 (0.8 - 1.0, 11 - 14)
Limit 59 - 98 (0.6 - 1.0,9-14)
Leakage test pressure157 (1.6, 23)
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ENGINE COOLING SYSTEM
Overheating Cause Analysis (Cont'd)
LC-25

MAINTENANCE
SECTION
MA
CONTENTS
PRECAUTIONS...............................................................2
Supplemental Restraint System (SRS)²AIR
BAG²and²SEAT BELT PRE-TENSIONER²...............2
PREPARATION...............................................................3
Special Service Tool ....................................................3
Commercial Service Tool .............................................3
GENERAL MAINTENANCE............................................4
PERIODIC MAINTENANCE............................................6
Schedule 1 ...................................................................7
EMISSION CONTROL SYSTEM MAINTENANCE.........7
CHASSIS AND BODY MAINTENANCE........................8
Schedule 2 ...................................................................9
EMISSION CONTROL SYSTEM MAINTENANCE.........9
CHASSIS AND BODY MAINTENANCE......................10
RECOMMENDED FLUIDS AND LUBRICANTS........... 11
Fluids and Lubricants ................................................ 11
SAE Viscosity Number ..............................................12
GASOLINE ENGINE OIL..........................................12
GEAR OIL...............................................................12
Anti-freeze Coolant Mixture Ratio .............................12
ENGINE MAINTENANCE..............................................13
Checking Drive Belts .................................................13
Changing Engine Coolant..........................................14
-DRAINING ENGINE COOLANT-..............................14
-REFILLING ENGINE COOLANT-..............................15
-FLUSHING COOLING SYSTEM-..............................16
Checking Fuel Lines ..................................................16
Changing Fuel Filter ..................................................16
WITH CONSULT-II..............................................16
WITHOUT CONSULT-II.......................................17
Changing Air Cleaner Filter .......................................17
VISCOUS PAPER TYPE...........................................17
Changing Engine Oil..................................................18
Changing Oil Filter .....................................................18
Changing Spark Plugs ...............................................19
Checking EVAP Vapor Lines .....................................20
CHASSIS AND BODY MAINTENANCE.......................21
Checking Exhaust System.........................................21
Checking A/T Fluid ....................................................21
Changing A/T Fluid ....................................................21Checking All-mode 4WD Transfer Fluid ....................22
Changing All-mode 4WD Transfer Fluid ....................22
Checking Propeller Shaft ...........................................23
Greasing Propeller Shaft ...........................................23
Checking Differential Gear Oil ...................................23
Changing Differential Gear Oil ..................................24
LIMITED-SLIP DIFFERENTIAL GEAR........................24
Balancing Wheels ......................................................24
Tire Rotation ..............................................................24
Checking Brake Fluid Level and Leaks.....................25
Checking Brake Lines and Cables ............................25
Checking Disc Brake .................................................25
ROTOR...................................................................25
CALIPER.................................................................25
PAD........................................................................25
Checking Drum Brake ...............................................26
WHEEL CYLINDER..................................................26
DRUM.....................................................................26
LINING....................................................................26
TEMPORARY METHOD FOR CHECKING LINING
WEAR
.....................................................................26
Checking Steering Gear, Linkage and Transfer
Gear ...........................................................................26
STEERING GEAR....................................................26
STEERING LINKAGE...............................................26
STEERING TRANSFER GEAR..................................26
Checking Power Steering Fluid and Lines ................27
CHECKING FLUID LEVEL........................................27
CHECKING LINES...................................................27
Lubricating Locks, Hinges and Hood Latches...........27
Checking Seat Belts, Buckles, Retractors,
Anchors and Adjusters...............................................28
SERVICE DATA AND SPECIFICATIONS (SDS).........29
Engine Maintenance ..................................................29
DRIVE BELT DEFLECTION......................................29
DRIVE BELT TENSION............................................29
SPARK PLUG TYPE................................................29
Chassis and Body Maintenance ................................29
WHEEL BALANCE...................................................29
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NBMA0005
Fluids and LubricantsNBMA0005S01
Capacity (Approximate)
Recommended Fluids/Lubricants
US measure Imp measure Liter
Engine oilDrain and
refillWith oil filter 5-1/4 qt 4-3/8 qt 5.0
IAPI Certification Mark*1
IAPI grade SG/SH, Energy Conserv-
ingI&IIorAPIgrade SJ, Energy
Conserving*1
IILSAC grade GF-I & GF-II*1 Without oil
filter5-1/8 qt 4-1/4 qt 4.8
Dry engine
(Engine overhaul)7-1/4 qt 6 qt 6.8
Cooling system (With reservoir) 9-3/4 qt 8-1/8 qt 9.2Genuine Nissan anti-freeze coolant or
equivalent
All-mode 4WD transfer fluid 3-1/8 qt 2-5/8 qt 3.0Nissan Matic ªDº (Continental U.S. and
Alaska) or Canada NISSAN Automatic
Transmission Fluid*2
Differential
carrier gear
oilFront (4WD) 3-7/8 pt 3-1/4 pt 1.85Standard differential gear: API GL-5*1
Limited-slip differential (LSD) gear:
Use only LSD gear oil API GL-5 and
SAE 80W-90*5 approved for Nissan
LSD*6. Rear 5-7/8 pt 4-7/8 pt 2.8
Automatic transmission fluid2WD
9 qt 7-1/2 qt 8.5Nissan Matic ªDº (Continental U.S. and
Alaska) or Canada NISSAN Automatic
Transmission Fluid*3 4WD
Power steering fluid Ð Ð Ð Genuine NISSAN PSF II or equivalent*7
Brake fluid Ð Ð ÐGenuine Nissan Brake Fluid*4 or
equivalent DOT 3 (U.S. FMVSS No.
116)
Propeller shaft grease Ð Ð ÐNLGI No. 2 (Molybdenum disulphide
lithium soap base)
Multi-purpose grease Ð Ð Ð NLGI No. 2 (Lithium soap base)
*1: For further details, see ªSAE Viscosity Numberº.
*2: Outside the continental United States and Alaska contact an authorized INFINITI dealership for more information regarding suitable
fluids, including recommended brand(s) of DEXRON
TMIII/MERCONTMAutomatic Transmission Fluid.
*3: DEXRONTMIII/MERCONTMor equivalent may also be used. Outside the continental United States and Alaska contact an autho-
rized INFINITI dealership for more information regarding suitable fluids, including recommended brand(s) of DEXRONTMIII/MERCONTM
Automatic Transmission Fluid.
*4: Available in mainland U.S.A. through your INFINITI dealer.
*5: SAE 90 is acceptable in ambient temperatures above þ18ÉC (0ÉF).
*6: Contact an INFINITI dealer for a list of approved oils.
*7: Genuine NISSAN PSF, Canada NISSAN Automatic Transmission Fluid, DEXRON
TMIII/MERCONTMor equivalent ATF may also be
used.
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RECOMMENDED FLUIDS AND LUBRICANTS
Fluids and Lubricants
MA-11

MMA117AA
SAE Viscosity NumberNBMA0005S02GASOLINE ENGINE OILNBMA0005S0201SAE 5W-30 viscosity oil is preferred for all temperatures. SAE
10W-30 and 10W-40 viscosity oil may be used if the ambient tem-
perature is above þ18ÉC (0ÉF).
MMA118A
GEAR OILNBMA0005S020280W-90 for differential is preferable.
SMA947CA
Anti-freeze Coolant Mixture RatioNBMA0005S03The engine cooling system is filled at the factory with a high-quality,
year-round, anti-freeze coolant solution. The anti-freeze solution
contains rust and corrosion inhibitors. Therefore, additional cooling
system additives are not necessary.
CAUTION:
When adding or replacing coolant, be sure to use only a Genu-
ine Nissan anti-freeze coolant or equivalent with the proper
mixture ratio of 50% anti-freeze and 50% demineralized water/
distilled water. Other types of coolant solutions may damage
your engine cooling system.
RECOMMENDED FLUIDS AND LUBRICANTS
SAE Viscosity Number
MA-12

SMA857C
SMA858C
Changing Engine CoolantNBMA0011WARNING:
To avoid the danger of being scalded, never change the cool-
ant when the engine is hot.
ÐDRAINING ENGINE COOLANTÐNBMA0011S011. Set air conditioning system as follows to prevent coolant from
remaining in the system.
a. Turn ignition switch ªONº and set temperature controller to
maximum hot position.
b. Wait 10 seconds before turning ignition switch ªOFFº.
2. Open radiator drain plug at the bottom of radiator.
3. Remove radiator filler cap.
Remove reservoir tank, drain coolant, then clean reservoir
tank.
Install it temporarily.
IBe careful not to allow coolant to contact drive belts.
SMA092D
SMA093D
SMA094DA
4. Open drain plugs on right side of cylinder block and water
pump side, then open air relief plugs to drain coolant.
5. Check drained coolant for contaminants such as rust, coorro-
sion or discoloration. If contaminated flush engine cooling
system, ªRefer to FLUSHING COOLING SYSTEMº, MA-16.
ENGINE MAINTENANCE
Changing Engine Coolant
MA-14

SMA182B
ÐREFILLING ENGINE COOLANTÐNBMA0011S021. Install reservoir tank, radiator drain plug, and cylinder block
drain plugs.
IApply sealant to the thread of cylinder block drain plugs.
:8-11N´m(0.8 - 1.2 kg-m, 70 - 104 in-lb) Front side
: 18 - 21 N´m (1.8 - 2.2 kg-m, 13 - 15 ft-lb) Right side
2. Fill coolant up to the top of the radiator mouth. While filling,
tighten each air bleeding plug from where coolant overflows.
Fill in the coolant again up to top of the mouth.
3. Reservoir tank with coolant up to the MAX level and install
radiator cap.
Air relief plugs:
: 6.7 - 7.9 N´m (0.68 - 0.81 kg-m, 59 - 70 in-lb)
Use Geniune Nissan anti-freeze coolant or equivalent mixed
with demineralized water/distilled water.
For coolant mixture ratio, refer to ªRECOMMENDED FLUIDS AND
LUBRICANTSº, MA-11.
Coolant capacity (Without reservoir tank):
8.6(9-1/8 US qt, 7-5/8 Imp qt)
SMA412B
Reservoir tank capacity (for MAX level):
0.6(5/8 US qt, 1/2 Imp qt)
Pour coolant through coolant filler neck slowly to allow air in
system to escape.
4. Warm up engine to normal operating temperature.
5. Run engine at 3,000 rpm for 10 seconds and return to idle
speed.
IRepeat 2 or 3 times.
Watch coolant temperature gauge so as not to overheat the
engine.
6. Stop engine and cool it down.
ICool down using a fan to reduce the time.
7. Remove the radiator filler cap and check coolant level.
IIf necessary, refill radiator up to filler neck with coolant.
8. Refill reservoir tank to Max line with coolant.
9. Repeat steps 4 through step 8 two or more times.
10. Warm up engine, and check for sound of coolant flow while
running engine from idle up to 3,000 rpm with heater tempera-
ture control set at several positions between COOL and HOT.
ISound may be noticeable at heater water cock.
11. If sound is heard, bleed air from cooling system by repeating
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ENGINE MAINTENANCE
Changing Engine Coolant (Cont'd)
MA-15

steps 4 through 8 until coolant level no longer drops.
IClean excess coolant from engine.
ÐFLUSHING COOLING SYSTEMÐNBMA0011S031. Open air relief plug.
2. Fill radiator with water until water spills from the air relief holes,
then close air relief plugs. Fill radiator and reservoir tank with
water and reinstall radiator cap.
3. Run engine and warm it up to normal operating temperature.
4. Rev engine two or three times under no-load.
5. Stop engine and wait until it cools down.
6. Drain water.
7. Repeat steps 1 through 6 until clear water begins to drain from
radiator.
SMA803A
Checking Fuel LinesNBMA0012Inspect fuel lines and tank for improper attachment, leaks, cracks,
damage, loose connections, chafing or deterioration.
If necessary, repair or replace faulty parts.
MMA104A
CAUTION:
Tighten high-pressure rubber hose clamp so that clamp end is
3 mm (0.12 in) from hose end.
Tightening torque specifications are the same for all rubber
hose clamps.
Ensure that screw does not contact adjacent parts.
SEF214Y
Changing Fuel FilterNBMA0013WARNING:
Before removing fuel filter, release fuel pressure from fuel line.
WITH CONSULT-IINBMA0013S011. Turn ignition switch ªONº.
2. Perform ªFUEL PRESSURE RELEASEº in ªWORK SUP-
PORTº mode with CONSULT-II.
3. Start engine.
4. After engine stalls, crank engine two or three times to release
all fuel pressure.
ENGINE MAINTENANCE
Changing Engine Coolant (Cont'd)
MA-16

SMA211A
Checking Exhaust SystemNBMA0019Check exhaust pipes, muffler and mounting for improper
attachment, leaks, cracks, damage, loose connections, chafing or
deterioration.
SMA121D
Checking A/T FluidNBMA00201. Warm up engine.
2. Check for fluid leakage.
3. Before driving, fluid level can be checked at fluid temperatures
of 30 to 50ÉC (86 to 122ÉF) using ªCOLDº range on dipstick.
a. Park vehicle on level surface and set parking brake.
b. Start engine and move selector lever through each gear posi-
tion. Leave selector lever in ªPº position.
c. Check fluid level with engine idling.
d. Remove dipstick and note reading. If level is at low side of
either range, and fluid to the charging pipe.
e. Re-insert dipstick into charging pipe as far as it will go.
f. Remove dipstick and note reading. If reading is at low side of
range, add fluid to the charging pipe.
Do not overfill.
4. Drive vehicle for approximately 5 minutes in urban areas.
5. Re-check fluid level at fluid temperatures of 50 to 80ÉC (122
to 176ÉF) using ªHOTº range on dipstick.
SMA853B
6. Check fluid condition.
IIf fluid is very dark or smells burned, refer to AT section for
checking operation of A/T. Flush cooling system after repair of
A/T.
IIf A/T fluid contains frictional material (clutches, bands, etc.),
replace radiator and flush cooler line using cleaning solvent
and compressed air after repair of A/T. Refer to LC-19, ªRadia-
torº.
SMA515C
Changing A/T FluidNBMA00211. Warm up A/T fluid.
2. Stop engine.
3. Drain A/T fluid from drain plug and refill with new A/T fluid.
Always refill same volume with drained fluid.
Fluid grade:
Nissan Matic ªDº (Continental U.S. and Alaska) or
Canada NISSAN Automatic Transmission Fluid.
Refer to ªRECOMMENDED FLUIDS AND
LUBRICANTSº, MA-11.
Fluid capacity (With torque converter):
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CHASSIS AND BODY MAINTENANCE
Checking Exhaust System
MA-21