Infiniti QX4 (R50). Manual — part 430
VALVE GUIDE
NBEM0032S06
Unit: 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 clearance
Intake
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 limit
Intake
—
0.24 (0.0094)
Exhaust
—
0.28 (0.0110)
Projection length “L”
12.6 - 12.8 (0.496 - 0.504)
Valve Seat
NBEM0033
Unit: 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 fit
Intake
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 Bearing
NBEM0034
Unit: mm (in)
Standard
Limit
Camshaft journal to bearing clearance
No. 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 bearing
No. 1
26.000 - 26.021 (1.0236 - 1.0244)
No. 2, 3, 4
23.500 - 23.521 (0.9252 - 0.9260)
—
Outer diameter of camshaft journal
No. 1
25.935 - 25.955 (1.0211 - 1.0218)
No. 2, 3, 4
23.445 - 23.465 (0.9230 - 0.9238)
—
Camshaft runout [TIR*]
Less than 0.02 (0.0008)
0.05 (0.0020)
Camshaft sprocket runout [TIR*]
Less than 0.15 (0.0059)
—
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 “A”
Intake and exhaust
44.465 - 44.655 (1.7506 - 1.7581)
Wear limit of cam height
0.2 (0.008)
Valve timing
Unit: degree
a
b
c
d
e
f
232
230
–3
53
6
46
Cylinder Block
NBEM0035
Unit: mm (in)
SEM022EA
Surface flatness
Standard
Less than 0.03 (0.0012)
Limit
0.10 (0.0039)
Cylinder bore
Inner diameter
Standard
Grade 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 − Y)
Less than 0.015 (0.0006)
Taper (A − B − C)
Less than 0.015 (0.0006)
GI
MA
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
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. 7
63.993 - 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
cylinders
Standard
Less than 0.03 (0.0012)
Piston, Piston Ring and Piston Pin
NBEM0036
AVAILABLE PISTON
NBEM0036S01
Unit: mm (in)
SEM882E
Piston skirt diameter “A”
Standard
Grade 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)
“a” dimension
41.0 (1.614)
Piston pin hole diameter
Grade 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
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