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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

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

232

230

–3

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)

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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