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Infiniti Q45 (FY33). Manual - part 424

VALVE

Unit: mm (in)

SEM188

Valve head diameter “D”

Intake

38.0 - 38.3 (1.496 - 1.508)

Exhaust

33.0 - 33.2 (1.299 - 1.307)

Valve length “L”

Intake

101.70 - 102.30 (4.0039 - 4.0276)

Exhaust

102.12 - 102.72 (4.0205 - 4.0441)

Valve stem diameter “d”

Intake

6.966 - 6.971 (0.2743 - 0.2744)

Exhaust

7.960 - 7.965 (0.3134 - 0.3136)

Valve seat angle “

”

Intake

45°15

′

- 45°45

′

Exhaust

Valve margin “T”

Intake

1.15 - 1.45 (0.0453 - 0.0571)

Exhaust

1.45 - 1.75 (0.0571 - 0.0689)

Valve margin “T” limit

More than 0.5 (0.020)

Valve stem end surface grinding
limit

Less than 0.2 (0.008)

Valve clearance

Intake

0 (0)

Exhaust

0 (0)

Valve spring

Free height

mm (in)

49.42 (1.9457)

Pressure

N (kg, lb) at height mm (in)

Standard

535.5 (54.6, 120.4)

at 26.8 (1.055)

Limit

477.6 (48.7, 107.4)

at 26.8 (1.055)

Out-of-square

mm (in)

Less than 2.0 (0.079)

Hydraulic lash adjuster (HLA)

Unit: mm (in)

HLA outer diameter

16.980 - 16.993

(0.6685 - 0.6690)

HLA guide inner diameter

17.000 - 17.020

(0.6693 - 0.6701)

Clearance between HLA and HLA guide

0.007 - 0.040

(0.0003 - 0.0016)

Valve guide

Unit: mm (in)

SEM933C

Standard

Service

Valve guide

Outer
diameter

Intake

11.023 - 11.034

(0.4340 - 0.4344)

11.223 - 11.234

(0.4418 - 0.4423)

Exhaust

12.023 - 12.034

(0.4733 - 0.4738)

12.223 - 12.234

(0.4812 - 0.4817)

Valve guide

Inner diam-
eter (Fin-
ished size)

Intake

7.000 - 7.018 (0.2756 - 0.2763)

Exhaust

8.000 - 8.011 (0.3150 - 0.3154)

Cylinder head
valve guide
hole diameter

Intake

10.975 - 10.996

(0.4321 - 0.4329)

11.175 - 11.196

(0.4400 - 0.4408)

Exhaust

11.975 - 11.996

(0.4715 - 0.4723)

12.175 - 12.196

(0.4793 - 0.4802)

Interference fit of valve
guide

0.027 - 0.059 (0.0011 - 0.0023)

Standard

Limit

Stem to guide
clearance

Intake

0.029 - 0.052

(0.0011 - 0.0020)

0.086 (0.0034)

Exhaust

0.035 - 0.051

(0.0014 - 0.0020)

0.092 (0.0036)

Valve deflection limit

—

0.15 (0.0059)

Projection length “L”

17.15 - 17.35 (0.6752 - 0.6831)

IDX

SERVICE DATA AND SPECIFICATIONS (SDS)

Inspection and Adjustment (Cont’d)

EM-57

VALVE SEAT

Unit: mm (in)

SEM687EA

SEM621F

Standard

Service

Cylinder head seat recess diameter (D)

In.

39.000 - 39.016 (1.5354 - 1.5361)

39.500 - 39.516 (1.5551 - 1.5557)

Ex.

34.000 - 34.016 (1.3386 - 1.3392)

34.500 - 34.516 (1.3583 - 1.3589)

Valve seat interference fit

In.

0.081 - 0.113 (0.0032 - 0.0044)

Ex.

0.064 - 0.096 (0.0025 - 0.0038)

Valve seat outer diameter (d)

In.

39.097 - 39.113 (1.5392 - 1.5399)

39.597 - 39.613 (1.5589 - 1.5596)

Ex.

34.080 - 34.096 (1.3417 - 1.3424)

34.580 - 34.596 (1.3614 - 1.3620)

Depth (H)

In.

6.32 - 6.52 (0.2488 - 0.2567)

Ex.

6.15 - 6.35 (0.2421 - 0.2500)

Height (h)

6.2 - 6.3 (0.244 - 0.248)

Depth (L)

In.

46.25 - 46.95 (1.8209 - 1.8484)

Ex.

46.21 - 46.91 (1.8193 - 1.8468)

SERVICE DATA AND SPECIFICATIONS (SDS)

Inspection and Adjustment (Cont’d)

EM-58

CAMSHAFT AND CAMSHAFT BEARING

Unit: mm (in)

Standard

Limit

Camshaft journal to
bearing clearance

0.045 - 0.086

(0.0018 - 0.0034)

0.15 (0.0059)

Inner diameter of cam-
shaft bearing

26.000 - 26.021

(1.0236 - 1.0244)

—

Outer diameter of cam-
shaft journal

25.935 - 25.955

(1.0211 - 1.0218)

—

Camshaft runout [TIR*]

Less than

0.02 (0.0008)

0.05 (0.0020)

Camshaft sprocket
runout [TIR*]

Less than

0.25 (0.0098)

—

Camshaft end play

0.070 - 0.148

(0.0028 - 0.0058)

0.20 (0.0079)

EM671

Cam height “A”

Intake

37.858 - 38.048 (1.4905 - 1.4979)

Exhaust

34.969 - 35.159 (1.3767 - 1.3842)

Wear limit of cam height

0.05 (0.0020)

*Total indicator reading

CYLINDER BLOCK

Unit: mm (in)

SEM955CB

Surface flatness

Standard

Less than 0.03 (0.0012)

Limit

0.10 (0.0039)

Cylinder bore

Inner diameter

Standard

Grade No. 1

93.000 - 93.010 (3.6614 - 3.6618)

Grade No. 2

93.010 - 93.020 (3.6618 - 3.6622)

Grade No. 3

93.020 - 93.030 (3.6622 - 3.6626)

Wear limit

0.20 (0.0079)

Out-of-round (X − Y)

Less than 0.015 (0.0006)

Taper (A − B − C)

Less than 0.010 (0.0004)

Difference in inner diam-
eter between cylinders

Limit

Less than 0.03 (0.0012)

Main journal inner
diameter

Grade No. 0

68.944 - 68.948 (2.7143 - 2.7145)

Grade No. 1

68.948 - 68.952 (2.7145 - 2.7146)

Grade No. 2

68.952 - 68.956 (2.7146 - 2.7148)

Grade No. 3

68.956 - 68.960 (2.7148 - 2.7150)

Grade No. 4

68.960 - 68.964 (2.7150 - 2.7151)

Grade No. 5

68.964 - 68.968 (2.7151 - 2.7153)

IDX

SERVICE DATA AND SPECIFICATIONS (SDS)

Inspection and Adjustment (Cont’d)

EM-59

PISTON, PISTON RING AND PISTON PIN

Available piston

Unit: mm (in)

SEM882E

Piston skirt diameter “A”

Standard

Grade No. 1

92.980 - 92.990 (3.6606 - 3.6610)

Grade No. 2

92.990 - 93.000 (3.6610 - 3.6614)

Grade No. 3

93.000 - 93.010 (3.6614 - 3.6618)

0.20 (0.0079) over-
size (Service)

93.180 - 93.210 (3.6685 - 3.6697)

“a” dimension

54 (2.13)

Piston clearance to cylinder
block

0.010 - 0.030 (0.0004 - 0.0012)

Piston pin hole diameter

21.987 - 21.999 (0.8656 - 0.8661)

Piston ring

Unit: mm (in)

Standard

Limit

Side clearance

Top

0.040 - 0.080

(0.0016 - 0.0031)

0.1 (0.004)

2nd

0.030 - 0.070

(0.0012 - 0.0028)

End gap

Top

0.27 - 0.46

(0.0106 - 0.0181)

1.0 (0.039)

2nd

0.39 - 0.63

(0.0154 - 0.0248)

Oil (rail ring)

0.20 - 0.69

(0.0079 - 0.0272)

Piston pin

Unit: mm (in)

Piston pin outer diameter

21.989 - 22.001 (0.8657 - 0.8662)

Interference fit of piston pin
to piston

−0.004 to 0 (−0.0002 to 0)

Piston pin to connecting rod
bushing clearance

Standard

0.005 - 0.017 (0.0002 - 0.0007)

Limit

0.023 (0.0009)

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

CONNECTING ROD

Unit: mm (in)

Center distance

146.95 - 147.05 (5.7854 - 5.7894)

Bend, torsion [per 100 (3.94)]

Limit

0.15 (0.0059)

Torsion [per 100 (3.94)]

Limit

0.3 (0.012)

Connecting rod small end
inner diameter

24.980 - 25.000 (0.9835 - 0.9843)

Piston pin bushing inner
diameter*

22.000 - 22.012 (0.8661 - 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

SERVICE DATA AND SPECIFICATIONS (SDS)

Inspection and Adjustment (Cont’d)

EM-60

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