INFINITI QX4 2001 Factory Service Manual

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

VALVE GUIDENBEM0032S06Unit: mm (in)
SEM950E
Standard Service
Valve guide Outer diameter 10.023 - 10.034 (0.3946 - 0.3950) 10.223 - 10.234 (0.4025 - 0.4029)
Valve guide Inner diameter (Finished size) 6.000 - 6.018 (0.2362 - 0.2369)
Cylinder head valve guide hole diameter 9.975 - 9.996 (0.3927 - 0.3935) 10.175 - 10.196 (0.4006 - 0.4014)
Interference fit of valve guide 0.027 - 0.059 (0.0011 - 0.0023)
Standard Max. tolerance
Stem to guide clearanceIntake 0.020 - 0.053 (0.0008 - 0.0021) 0.08 (0.0031)
Exhaust 0.040 - 0.073 (0.0016 - 0.0029) 0.1 (0.004)
Valve deflection limitIntake Ð 0.24 (0.0094)
Exhaust Ð 0.28 (0.0110)
Projection length ªLº12.6 - 12.8 (0.496 - 0.504)
Valve SeatNBEM0033Unit: mm (in)
SEM021EB
GI
MA
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
SERVICE DATA AND SPECIFICATIONS (SDS)
Valve (Cont'd)
EM-79

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)
GI
MA
LC
EC
FE
AT
TF
PD
AX
SU
BR
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BT
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SERVICE DATA AND SPECIFICATIONS (SDS)
Camshaft and Camshaft Bearing (Cont'd)
EM-81

Main journal inner
diameter grade
(Without bearing)Grade No. A
Grade No. B
Grade No. C
Grade No. D
Grade No. E
Grade No. F
Grade No. G
Grade No. H
Grade No. J
Grade No. K
Grade No. L
Grade No. M
Grade No. N
Grade No. P
Grade No. R
Grade No. S
Grade No. T
Grade No. U
Grade No. V
Grade No. W
Grade No. X
Grade No. Y
Grade No. 4
Grade No. 763.993 - 63.994 (2.5194 - 2.5194)
63.994 - 63.995 (2.5194 - 2.5195)
63.995 - 63.996 (2.5195 - 2.5195)
63.996 - 63.997 (2.5195 - 2.5196)
63.997 - 63.998 (2.5196 - 2.5196)
63.998 - 63.999 (2.5196 - 2.5196)
63.999 - 64.000 (2.5196 - 2.5197)
64.000 - 64.001 (2.5197 - 2.5197)
64.001 - 64.002 (2.5197 - 2.5198)
64.002 - 64.003 (2.5198 - 2.5198)
64.003 - 64.004 (2.5198 - 2.5198)
64.004 - 64.005 (2.5198 - 2.5199)
64.005 - 64.006 (2.5199 - 2.5199)
64.006 - 64.007 (2.5199 - 2.5200)
64.007 - 64.008 (2.5200 - 2.5200)
64.008 - 64.009 (2.5200 - 2.5200)
64.009 - 64.010 (2.5200 - 2.5201)
64.010 - 64.011 (2.5201 - 2.5201)
64.011 - 64.012 (2.5201 - 2.5202)
64.012 - 64.013 (2.5202 - 2.5202)
64.013 - 64.014 (2.5202 - 2.5202)
64.014 - 64.015 (2.5202 - 2.5203)
64.015 - 64.016 (2.5203 - 2.5203)
64.016 - 64.017 (2.5203 - 2.5203)
Difference in inner
diameter between
cylindersStandardLess than 0.03 (0.0012)
Piston, Piston Ring and Piston PinNBEM0036AVAILABLE PISTONNBEM0036S01Unit: mm (in)
SEM882E
Piston skirt diameter ªAº StandardGrade No. 1 95.480 - 95.490 (3.7590 - 3.7594)
Grade No. 2 95.490 - 95.500 (3.7594 - 3.7598)
Grade No. 3 95.500 - 95.510 (3.7598 - 3.7602)
0.20 (0.0079) oversize (Service) 95.680 - 95.710 (3.7669 - 3.7681)
ªaº dimension41.0 (1.614)
Piston pin hole diameterGrade No. 0 21.993 - 21.999 (0.8659 - 0.8661)
Grade No. 1 21.999 - 22.005 (0.8661 - 0.8663)
Piston clearance to cylinder block 0.010 - 0.030 (0.0004 - 0.0012)
SERVICE DATA AND SPECIFICATIONS (SDS)
Cylinder Block (Cont'd)
EM-82

PISTON RING=NBEM0036S02Unit: mm (in)
Standard Limit
Side clearanceTop 0.040 - 0.080 (0.0016 - 0.0031) 0.11 (0.0043)
2nd 0.030 - 0.070 (0.0012 - 0.0028) 0.1 (0.004)
Oil ring 0.015 - 0.050 (0.0006 - 0.0020) Ð
End gapTop 0.23 - 0.33 (0.0091 - 0.0130) 0.54 (0.0213)
2nd 0.33 - 0.48 (0.0130 - 0.0189) 0.80 (0.0315)
Oil (rail ring) 0.20 - 0.80 (0.0079 - 0.0315) 0.95 (0.0374)
PISTON PINNBEM0036S03Unit: mm (in)
Piston pin outer diameterGrade No. 0 21.989 - 21.995 (0.8657 - 0.8659)
Grade No. 1 21.995 - 22.001 (0.8659 - 0.8662)
Interference fit of piston pin to piston 0.002 - 0.006 (0.0001 - 0.0002)
Piston pin to connecting rod bushing clearanceStandard 0.005 - 0.017 (0.0002 - 0.0007)
Limit 0.030 (0.0012)
*: Values measured at ambient temperature of 20ÉC (68ÉF)
Connecting RodNBEM0037Unit: mm (in)
Center distance144.15 - 144.25 (5.6752 - 5.6791)
Bend [per 100 (3.94)] Limit 0.15 (0.0059)
Torsion [per 100 (3.94)] Limit 0.30 (0.0118)
Connecting rod small end inner diameter 23.980 - 24.000 (0.9441 - 0.9449)
Piston pin bushing inner diameter*Grade No. 0 22.000 - 22.006 (0.8661 - 0.8664)
Grade No. 1 22.006 - 22.012 (0.8664 - 0.8666)
Connecting rod big end inner diameter 55.000 - 55.013 (2.1654 - 2.1659)
Side clearanceStandard 0.20 - 0.35 (0.0079 - 0.0138)
Limit 0.40 (0.0157)
*: After installing in connecting rod
GI
MA
LC
EC
FE
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TF
PD
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SU
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RS
BT
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SERVICE DATA AND SPECIFICATIONS (SDS)
Piston, Piston Ring and Piston Pin (Cont'd)
EM-83

CrankshaftNBEM0038Unit: mm (in)
Main journal dia. ªDmº gradeGrade No. A
Grade No. B
Grade No. C
Grade No. D
Grade No. E
Grade No. F
Grade No. G
Grade No. H
Grade No. J
Grade No. K
Grade No. L
Grade No. M
Grade No. N
Grade No. P
Grade No. R
Grade No. S
Grade No. T
Grade No. U
Grade No. V
Grade No. W
Grade No. X
Grade No. Y
Grade No. 4
Grade No. 759.975 - 59.974 (2.3612 - 2.3612)
59.974 - 59.973 (2.3612 - 2.3611)
59.973 - 59.972 (2.3611 - 2.3611)
59.972 - 59.971 (2.3611 - 2.3611)
59.971 - 59.970 (2.3611 - 2.3610)
59.970 - 59.969 (2.3610 - 2.3610)
59.969 - 59.968 (2.3610 - 2.3609)
59.968 - 59.967 (2.3609 - 2.3609)
59.967 - 59.966 (2.3609 - 2.3609)
59.966 - 59.965 (2.3609 - 2.3608)
59.965 - 59.964 (2.3608 - 2.3608)
59.964 - 59.963 (2.3608 - 2.3607)
59.963 - 59.962 (2.3607 - 2.3607)
59.962 - 59.961 (2.3607 - 2.3607)
59.961 - 59.960 (2.3607 - 2.3606)
59.960 - 59.959 (2.3606 - 2.3606)
59.959 - 59.958 (2.3606 - 2.3605)
59.958 - 59.957 (2.3605 - 2.3605)
59.957 - 59.956 (2.3605 - 2.3605)
59.956 - 59.955 (2.3605 - 2.3604)
59.955 - 59.954 (2.3604 - 2.3604)
59.954 - 59.953 (2.3604 - 2.3603)
59.953 - 59.952 (2.3603 - 2.3603)
59.952 - 59.951 (2.3603 - 2.3603)
Pin journal dia. ªDpºGrade No. 0 51.968 - 51.974 (2.0460 - 2.0462)
Grade No. 1 51.962 - 51.968 (2.0457 - 2.0460)
Grade No. 2 51.956 - 51.962 (2.0445 - 2.0457)
Center distance ªrº40.36 - 40.44 (1.5890 - 1.5921)
Out-of-round (X þ Y) Standard Less than 0.002 (0.0001)
Taper (A þ B) Standard Less than 0.002 (0.0001)
Runout [TIR*] Limit Less than 0.10 (0.0039)
Free end playStandard 0.10 - 0.25 (0.0039 - 0.0098)
Limit 0.30 (0.0118)
SEM645EM715
*: Total indicator reading
SERVICE DATA AND SPECIFICATIONS (SDS)
Crankshaft
EM-84

Available Main BearingNBEM0039
SEM175F
Grade number Thickness ªTº mm (in)Width ªWº
mm (in)Identification color
(UPR/LWR)Remarks
0 2.000 - 2.003 (0.0787 - 0.0789)
19.9 - 20.1
(0.783 - 0.791)Black
Grade is the same for
upper and lower bearings. 1 2.003 - 2.006 (0.0789 - 0.0790) Brown
2 2.006 - 2.009 (0.0790 - 0.0791) Green
3 2.009 - 2.012 (0.0791 - 0.0792) Yellow
4 2.012 - 2.015 (0.0792 - 0.0793) Blue
5 2.015 - 2.018 (0.0793 - 0.0794) Pink
6 2.018 - 2.021 (0.0794 - 0.0796) Purple
7 2.021 - 2.024 (0.0796 - 0.0797) White
01UPP 2.003 - 2.006 (0.0789 - 0.0790)
Brown/Black
Grade is different for upper
and lower bearings. LWR 2.000 - 2.003 (0.0787 - 0.0789)
12UPR 2.006 - 2.009 (0.0790 - 0.0791)
Green/Brown
LWR 2.003 - 2.006 (0.0789 - 0.0790)
23UPR 2.009 - 2.012 (0.0791 - 0.0792)
Yellow/Green
LWR 2.006 - 2.009 (0.0790 - 0.0791)
34UPR 2.012 - 2.015 (0.0792 - 0.0793)
Blue/Yellow
LWR 2.009 - 2.012 (0.0791 - 0.0792)
45UPR 2.015 - 2.018 (0.0793 - 0.0794)
Pink/Blue
LWR 2.012 - 2.015 (0.0792 - 0.0793)
56UPR 2.018 - 2.021 (0.0794 - 0.0796)
Purple/Pink
LWR 2.015 - 2.018 (0.0793 - 0.0794)
67UPR 2.021 - 2.024 (0.0796 - 0.0797)
White/Purple
LWR 2.018 - 2.021 (0.0794 - 0.0796)
UNDERSIZENBEM0039S01Unit: mm (in)
Thickness Main journal diameter ªDmº
0.25 (0.0098) 2.132 - 2.140 (0.0839 - 0.0843)Grind so that bearing clearance is the specified
value.
GI
MA
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
SERVICE DATA AND SPECIFICATIONS (SDS)
Available Main Bearing
EM-85

Available Connecting Rod BearingNBEM0040CONNECTING ROD BEARINGNBEM0040S01
Grade number Thickness ªTº mm (in) Identification color (mark)
0 1.500 - 1.503 (0.0591 - 0.0592) Black
1 1.503 - 1.506 (0.0592 - 0.0593) Brown
2 1.506 - 1.509 (0.0593 - 0.0594) Green
UNDERSIZENBEM0040S02Unit: mm (in)
Thickness Crank pin journal diameter ªDpº
0.25 (0.0098) 1.626 - 1.634 (0.0640 - 0.0643)Grind so that bearing clearance is the specified
value.
Miscellaneous ComponentsNBEM0041Unit: mm (in)
Drive plate runout [TIR]*Less than 0.15 (0.0059)
*: Total indicator reading
BEARING CLEARANCENBEM0041S01Unit: mm (in)
Main bearing clearanceStandard 0.035 - 0.045 (0.0014 - 0.0018)
Limit 0.065 (0.0026)
Connecting rod bearing clearanceStandard 0.034 - 0.059 (0.0013 - 0.0023)
Limit 0.070 (0.0028)
SERVICE DATA AND SPECIFICATIONS (SDS)
Available Connecting Rod Bearing
EM-86

ACCELERATOR CONTROL, FUEL &
EXHAUST SYSTEMS
SECTION
FE
CONTENTS
PREPARATION...............................................................2
Special Service Tool ....................................................2
Commercial Service Tools ...........................................2
ACCELERATOR CONTROL SYSTEM...........................3
Removal and Installation .............................................3
Adjusting Accelerator Wire ..........................................3FUEL SYSTEM................................................................4
Removal and Installation .............................................4
FUEL TANK...............................................................5
FUEL PUMP AND GAUGE.........................................6
EXHAUST SYSTEM........................................................8
Removal and Installation .............................................8
GI
MA
EM
LC
EC
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PD
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BR
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