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 “
α
”
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)
GI
MA
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
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)
GI
MA
LC
EC
FE
AT
PD
FA
RA
BR
ST
RS
BT
HA
EL
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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