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Infiniti QX4 (R50). Manual - part 431

PISTON RING

=NBEM0036S02

Unit: mm (in)

Standard

Limit

Side clearance

Top

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)

—

End gap

Top

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 PIN

NBEM0036S03

Unit: mm (in)

Piston pin outer diameter

Grade 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 clearance

Standard

0.005 - 0.017 (0.0002 - 0.0007)

Limit

0.030 (0.0012)

*: Values measured at ambient temperature of 20°C (68°F)

Connecting Rod

NBEM0037

Unit: mm (in)

Center distance

144.15 - 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 clearance

Standard

0.20 - 0.35 (0.0079 - 0.0138)

Limit

0.40 (0.0157)

*: After installing in connecting rod

IDX

SERVICE DATA AND SPECIFICATIONS (SDS)

Piston, Piston Ring and Piston Pin (Cont’d)

EM-83

Crankshaft

NBEM0038

Unit: mm (in)

Main journal dia. “Dm” grade

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

59.975 - 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. “Dp”

Grade 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 “r”

40.36 - 40.44 (1.5890 - 1.5921)

Out-of-round (X − Y)

Standard

Less than 0.002 (0.0001)

Taper (A − B)

Standard

Less than 0.002 (0.0001)

Runout [TIR*]

Limit

Less than 0.10 (0.0039)

Free end play

Standard

0.10 - 0.25 (0.0039 - 0.0098)

Limit

0.30 (0.0118)

SEM645

EM715

*: Total indicator reading

SERVICE DATA AND SPECIFICATIONS (SDS)

Crankshaft

EM-84

Available Main Bearing

NBEM0039

SEM175F

Grade number

Thickness “T”

mm (in)

Width “W”

mm (in)

Identification color

(UPR/LWR)

Remarks

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.

2.003 - 2.006 (0.0789 - 0.0790)

Brown

2.006 - 2.009 (0.0790 - 0.0791)

Green

2.009 - 2.012 (0.0791 - 0.0792)

Yellow

2.012 - 2.015 (0.0792 - 0.0793)

Blue

2.015 - 2.018 (0.0793 - 0.0794)

Pink

2.018 - 2.021 (0.0794 - 0.0796)

Purple

2.021 - 2.024 (0.0796 - 0.0797)

White

UPP

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)

UPR

2.006 - 2.009 (0.0790 - 0.0791)

Green/Brown

LWR

2.003 - 2.006 (0.0789 - 0.0790)

UPR

2.009 - 2.012 (0.0791 - 0.0792)

Yellow/Green

LWR

2.006 - 2.009 (0.0790 - 0.0791)

UPR

2.012 - 2.015 (0.0792 - 0.0793)

Blue/Yellow

LWR

2.009 - 2.012 (0.0791 - 0.0792)

UPR

2.015 - 2.018 (0.0793 - 0.0794)

Pink/Blue

LWR

2.012 - 2.015 (0.0792 - 0.0793)

UPR

2.018 - 2.021 (0.0794 - 0.0796)

Purple/Pink

LWR

2.015 - 2.018 (0.0793 - 0.0794)

UPR

2.021 - 2.024 (0.0796 - 0.0797)

White/Purple

LWR

2.018 - 2.021 (0.0794 - 0.0796)

UNDERSIZE

NBEM0039S01

Unit: mm (in)

Thickness

Main journal diameter “Dm”

0.25 (0.0098)

2.132 - 2.140 (0.0839 - 0.0843)

Grind so that bearing clearance is the specified
value.

IDX

SERVICE DATA AND SPECIFICATIONS (SDS)

Available Main Bearing

EM-85

Available Connecting Rod Bearing

NBEM0040

CONNECTING ROD BEARING

NBEM0040S01

Grade number

Thickness “T”

mm (in)

Identification color (mark)

1.500 - 1.503 (0.0591 - 0.0592)

Black

1.503 - 1.506 (0.0592 - 0.0593)

Brown

1.506 - 1.509 (0.0593 - 0.0594)

Green

UNDERSIZE

NBEM0040S02

Unit: mm (in)

Thickness

Crank pin journal diameter “Dp”

0.25 (0.0098)

1.626 - 1.634 (0.0640 - 0.0643)

Grind so that bearing clearance is the specified
value.

Miscellaneous Components

NBEM0041

Unit: mm (in)

Drive plate runout [TIR]*

Less than 0.15 (0.0059)

*: Total indicator reading

BEARING CLEARANCE

NBEM0041S01

Unit: mm (in)

Main bearing clearance

Standard

0.035 - 0.045 (0.0014 - 0.0018)

Limit

0.065 (0.0026)

Connecting rod bearing clearance

Standard

0.034 - 0.059 (0.0013 - 0.0023)

Limit

0.070 (0.0028)

SERVICE DATA AND SPECIFICATIONS (SDS)

Available Connecting Rod Bearing

EM-86

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