2001 INFINITI QX4 height

SEL690V
Gyro (Angular Speed Sensor)NBEL0228S0204IThe oscillator gyro sensor is used to detect changes in vehicle
steering angle.
IThe oscillator gyro periodically senses oscillatory variation at
the oscillation terminals. This variation is caused by changes
in the vehicle angular velocity. Voltage variations are sensed
by ceramic voltage sensors at the left and right sides of the
terminals. Vehicle angular velocity corresponds directly with
these changes in voltage.
IThe gyro is built into the display & navigation (NAVI) control
unit.
MAP DISPLAY
BIRDVIEW
R
SEL636X
BIRDVIEWTNBEL0228S0205The BIRDVIEWTprovides a detailed and easily seen display of
road conditions covering the vehicle's immediate to distant area.
SEL691V
DescriptionNBEL0228S0206IDisplay area: Trapezoidal representation showing approximate
distances (Wn, D, and Wd).
ITen horizontal grid lines indicate display width while six verti-
cal grid lines indicate display depth and direction.
IDrawing line area shows open space, depth, and immediate
front area. Each area is to a scale of approximately 5:6:25.
IWhen the ªZMþº button is pushed, the view point height is
increased. Pushing the ªZM+º button decreases the height.
Pushing the ªZMþº button or the ªZM+º button during operation
indicates the scale change and the view point height at the
left-hand side of the screen.
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NAVIGATION SYSTEM
System Description (Cont'd)
EL-389

ENGINE MECHANICAL
SECTION
EM
CONTENTS
PRECAUTIONS...............................................................3
Parts Requiring Angular Tightening .............................3
Liquid Gasket Application Procedure ..........................3
PREPARATION...............................................................4
Special Service Tools ..................................................4
Commercial Service Tools ...........................................6
NOISE, VIBRATION AND HARSHNESS (NVH)
TROUBLESHOOTING.....................................................8
NVH Troubleshooting - Engine Noise .........................9
OUTER COMPONENT PARTS.....................................10
Removal and Installation ...........................................10
TIGHTENING PROCEDURES...................................12
MEASUREMENT OF COMPRESSION PRESSURE....14
OIL PAN.........................................................................15
Components...............................................................15
Removal .....................................................................15
Installation ..................................................................18
TIMING CHAIN..............................................................20
Components...............................................................20
POSITION FOR APPLYING LIQUID GASKET............21
Removal .....................................................................23
Inspection...................................................................29
Installation ..................................................................29
OIL SEAL.......................................................................35
Replacement ..............................................................35
VALVE OIL SEAL.....................................................35
OIL SEAL INSTALLATION DIRECTION.....................36
FRONT OIL SEAL....................................................36
REAR OIL SEAL......................................................36
CYLINDER HEAD..........................................................38
Components...............................................................38
Removal .....................................................................39
Disassembly...............................................................41
Inspection...................................................................42
CYLINDER HEAD DISTORTION...............................42
CAMSHAFT VISUAL CHECK....................................42
CAMSHAFT RUNOUT..............................................42
CAMSHAFT CAM HEIGHT.......................................42
CAMSHAFT JOURNAL CLEARANCE........................42
CAMSHAFT END PLAY............................................43
CAMSHAFT SPROCKET RUNOUT...........................43
VALVE GUIDE CLEARANCE....................................43
VALVE GUIDE REPLACEMENT................................44
VALVE SEATS.........................................................45
REPLACING VALVE SEAT FOR SERVICE PARTS....45
VALVE DIMENSIONS...............................................46
VALVE SPRING.......................................................46
VALVE LIFTER........................................................46
Assembly ...................................................................47
Installation ..................................................................47
Valve Clearance.........................................................52
CHECKING.............................................................52
ADJUSTING............................................................54
ENGINE ASSEMBLY.....................................................57
Removal and Installation ...........................................57
REMOVAL...............................................................58
INSTALLATION........................................................60
CYLINDER BLOCK.......................................................61
Components...............................................................61
CYLINDER BLOCK HEATER....................................62
Removal and Installation ...........................................62
Disassembly...............................................................62
PISTON, CRANKSHAFT AND OIL JET......................62
Inspection...................................................................63
PISTON AND PISTON PIN CLEARANCE..................63
PISTON RING SIDE CLEARANCE............................64
PISTON RING END GAP..........................................64
CONNECTING ROD BEND AND TORSION...............65
CYLINDER BLOCK DISTORTION AND WEAR...........65
PISTON-TO-BORE CLEARANCE..............................66
CRANKSHAFT.........................................................67
BEARING CLEARANCE...........................................67
CONNECTING ROD BUSHING CLEARANCE
(SMALL END)
..........................................................70
DRIVE PLATE RUNOUT..........................................70
Assembly ...................................................................71
PISTON..................................................................71
OIL JET..................................................................71
CRANKSHAFT.........................................................71
REPLACEMENT OF PILOT CONVERTER.................74
DRIVE PLATE.........................................................74
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SEM861E
InspectionNBEM0019CYLINDER HEAD DISTORTIONNBEM0019S01Clean surface of cylinder head.
Use a reliable straightedge and feeler gauge to check the flatness
of cylinder head surface.
Check along six positions shown in the figure.
Head surface flatness: Limit 0.1 mm (0.004 in)
If beyond the specified limit, resurface or replace it.
The limit for cylinder head resurfacing is determined by the
cylinder block resurfacing.
Resurfacing limit:
Amount of cylinder head resurfacing is ªAº.
Amount of cylinder block resurfacing is ªBº.
The maximum limit : A+ B = 0.2 mm (0.008 in)
After resurfacing cylinder head, check that camshaft rotates freely
by hand. If resistance is felt, cylinder head must be replaced.
Nominal cylinder head height:
126.3 - 126.5 mm (4.972 - 4.980 in)
SEM191F
CAMSHAFT VISUAL CHECKNBEM0019S02Check camshaft for scratches, seizure and wear.
CAMSHAFT RUNOUTNBEM0019S031. Measure camshaft runout at A and B as shown in the figure.
Runout (Total indicator reading):
Limit 0.05 mm (0.0020 in)
2. If it exceeds the limit, replace camshaft.
SEM549A
CAMSHAFT CAM HEIGHTNBEM0019S041. Measure camshaft cam height.
Standard cam height:
Intake and exhaust
44.465 - 44.655 mm (1.7506 - 1.7581 in)
Cam wear limit:
0.2 mm (0.008 in)
2. If wear is beyond the limit, replace camshaft.
SEM862E
CAMSHAFT JOURNAL CLEARANCENBEM0019S051. Install camshaft bracket and tighten bolts to the specified
torque.
2. Measure inner diameter ªAº of camshaft bearing.
Standard inner diameter:
No. 1: 26.000 - 26.021 mm (1.0236 - 1.0244 in)
No. 2, 3, 4: 23.500 - 23.521 mm (0.9252 - 0.9260 in)
CYLINDER HEAD
Inspection
EM-42

SEM188A
VALVE DIMENSIONSNBEM0019S12Check dimensions of each valve. For dimensions, refer to SDS
(EM-76).
When valve head has been worn down to 0.5 mm (0.020 in) in
margin thickness, replace valve.
Grinding allowance for valve stem tip is 0.2 mm (0.008 in) or
less.
SEM288A
VALVE SPRINGNBEM0019S13SquarenessNBEM0019S13011. Measure dimension ªSº.
Out-of-square ªSº:
Less than 2.0 mm (0.079 in)
2. If it exceeds the limit, replace spring.
EM113
PressureNBEM0019S1302Check valve spring pressure at specified spring height.
Pressure:
Standard
202 N (20.6 kg, 45.4 lb) at height 37.0 mm (1.457 in)
Limit
More than 436 N (44.5 kg, 98.1 lb) at height 28.2
mm (1.110 in)
If it exceeds the limit, replace spring.
SEM960E
VALVE LIFTERNBEM0019S141. Check contact and sliding surfaces for wear or scratches.
SEM961E
2. Check diameter of valve lifter and valve lifter guide bore.
Valve lifter outer diameter:
34.960 - 34.975 mm (1.3764 - 1.3770 in)
CYLINDER HEAD
Inspection (Cont'd)
EM-46

SEM038F
SEM003F
CONNECTING ROD BEND AND TORSIONNBEM0027S04Bend:
Limit 0.15 mm (0.0059 in)
per 100 mm (3.94 in) length
Torsion:
Limit 0.30 mm (0.0118 in)
per 100 mm (3.94 in) length
If it exceeds the limit, replace connecting rod assembly.
SEM123C
CYLINDER BLOCK DISTORTION AND WEARNBEM0027S05IClean upper surface of cylinder block.
Use a reliable straightedge and feeler gauge to check the flat-
ness of cylinder block surface.
Check along six positions shown in the figure.
Distortion limit: 0.10 mm (0.0039 in)
IIf out of specification, resurface it. The limit for cylinder block
resurfacing is determined by cylinder head resurfacing in
engine.
Resurfacing limit:
Amount of cylinder head resurfacing is ªAº.
Amount of cylinder block resurfacing is ªBº.
The maximum limit is as follows:
A + B = 0.2 mm (0.008 in)
Nominal cylinder block height from crankshaft center:
214.95 - 215.05 mm (8.4626 - 8.4665 in)
Refer to SDS (EM-81).
IIf necessary, replace cylinder block.
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CYLINDER BLOCK
Inspection (Cont'd)
EM-65

Thickness mm (in) Identification mark
2.82 (0.1110) 282
2.83 (0.1114) 283
2.84 (0.1118) 284
2.85 (0.1122) 285
2.86 (0.1126) 286
2.87 (0.1130) 287
2.88 (0.1134) 288
2.89 (0.1138) 289
2.90 (0.1142) 290
2.91 (0.1146) 291
2.92 (0.1150) 292
2.93 (0.1154) 293
2.94 (0.1157) 294
2.95 (0.1161) 295
SEM966E
VALVE SPRINGNBEM0032S04
Free height mm (in)47.10 (1.8543)
Pressure N (kg, lb) at height mm (in)Standard 202 (20.6, 45.4) at 37.0 (1.457)
Limit 436 (44.5, 98.1) at 28.2 (1.110)
Out-of-square mm (in)Less than 2.0 (0.079)
VALVE LIFTERNBEM0032S05Unit: mm (in)
Valve lifter outer diameter 34.960 - 34.975 (1.3764 - 1.3770)
Lifter guide inner diameter 35.000 - 35.021 (1.3780 - 1.3788)
Clearance between lifter and lifter guide 0.025 - 0.061 (0.0010 - 0.0024)
SERVICE DATA AND SPECIFICATIONS (SDS)
Valve (Cont'd)
EM-78

SEM621F
Standard Service
Cylinder head seat recess diameter (D)Intake 38.000 - 38.016 (1.4961 - 1.4967) 38.500 - 38.516 (1.5157 - 1.5164)
Exhaust 32.200 - 32.216 (1.2677 - 1.2683) 32.700 - 32.716 (1.2874 - 1.2880)
Valve seat interference fitIntake 0.081 - 0.113 (0.0032 - 0.0044)
Exhaust 0.064 - 0.096 (0.0025 - 0.0038)
Valve seat outer diameter (d)Intake 38.097 - 38.113 (1.4999 - 1.5005) 38.597 - 38.613 (1.5196 - 1.5202)
Exhaust 32.280 - 32.296 (1.2709 - 1.2715) 32.780 - 32.796 (1.2905 - 1.2912)
Height (h)Intake 5.9 - 6.0 (0.232 - 0.236) 5.05 - 5.15 (0.1988 - 0.2028)
Exhaust 5.9 - 6.0 (0.232 - 0.236) 4.95 - 5.05 (0.1949 - 0.1988)
Depth (H)5.9 - 6.1 (0.232 - 0.240)
Depth (L)Intake 41.07 - 41.67 (1.6169 - 1.6405)
Exhaust 41.00 - 41.60 (1.6142 - 1.6378)
Camshaft and Camshaft BearingNBEM0034Unit: mm (in)
Standard Limit
Camshaft journal to bearing clearanceNo. 1
0.045 - 0.086 (0.0018 - 0.0034)
No. 2, 3, 4
0.035 - 0.076 (0.0014 - 0.0030)0.15 (0.0059)
Inner diameter of camshaft bearingNo. 1
26.000 - 26.021 (1.0236 - 1.0244)
No. 2, 3, 4
23.500 - 23.521 (0.9252 - 0.9260)Ð
Outer diameter of camshaft journalNo. 1
25.935 - 25.955 (1.0211 - 1.0218)
No. 2, 3, 4
23.445 - 23.465 (0.9230 - 0.9238)Ð
Camshaft runout [TIR*] Less than 0.02 (0.0008) 0.05 (0.0020)
Camshaft sprocket runout [TIR*] Less than 0.15 (0.0059) Ð
Camshaft end play 0.115 - 0.188 (0.0045 - 0.0074) 0.24 (0.0094)
*: Total indicator reading
SERVICE DATA AND SPECIFICATIONS (SDS)
Valve Seat (Cont'd)
EM-80

EM671
Cam height ªAº Intake and exhaust 44.465 - 44.655 (1.7506 - 1.7581)
Wear limit of cam height 0.2 (0.008)
Valve timing
Unit: degree
abcde f
232 230 ±3 53 6 46
Cylinder BlockNBEM0035Unit: mm (in)
SEM022EA
Surface flatnessStandardLess than 0.03 (0.0012)
Limit0.10 (0.0039)
Cylinder bore Inner diameterStandardGrade No. 1 95.500 - 95.510 (3.7598 - 3.7602)
Grade No. 2 95.510 - 95.520 (3.7602 - 3.7606)
Grade No. 3 95.520 - 95.530 (3.7606 - 3.7610)
Wear limit 0.20 (0.0079)
Out-of-round (X þ Y)Less than 0.015 (0.0006)
Taper (AþBþC)Less than 0.015 (0.0006)
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SERVICE DATA AND SPECIFICATIONS (SDS)
Camshaft and Camshaft Bearing (Cont'd)
EM-81