Infiniti G20 (P11). Manual — part 396
Valve
NCEM0031
VALVE
NCEM0031S01
Unit: mm (in)
SEM188A
Valve head diameter “D”
Intake
34.0 - 34.3 (1.339 - 1.350)
Exhaust
30.0 - 30.3 (1.181 - 1.193)
Valve length “L”
Intake
97.04 - 97.16 (3.8205 - 3.8252)
Exhaust
97.66 - 97.78 (3.8449 - 3.8496)
Valve stem diameter “d”
Intake
5.965 - 5.980 (0.2348 - 0.2354)
Exhaust
5.945 - 5.960 (0.2341 - 0.2346)
Valve seat angle “
α
”
Intake
45°15
′
- 45°45
′
Exhaust
Valve margin “T”
Intake
1.1 (0.043)
Exhaust
1.3 (0.051)
Valve margin “T” limit
More than 0.5 (0.020)
Valve stem end surface grinding limit
Less than 0.2 (0.008)
VALVE SPRING
NCEM0031S02
Free height
mm (in)
47.53 (1.8713)
Pressure
N (kg, lb) at height mm (in)
Standard
519 - 571 (53.0 - 58.2, 117 - 128)
at 27.0 (1.063)
Limit
491.8 (50.16, 110.6)
at 27.0 (1.063)
Out-of-square
mm (in)
Less than 2.1 (0.083)
HYDRAULIC LASH ADJUSTER (HLA)
NCEM0031S03
Unit: mm (in)
HLA outer diameter
16.980 - 16.993 (0.6685 - 0.6690)
HLA guide hole diameter
17.000 - 17.020 (0.6693 - 0.6701)
Clearance between HLA and HLA guide hole
0.007 - 0.040 (0.0003 - 0.0016)
GI
MA
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
SERVICE DATA AND SPECIFICATIONS (SDS)
Valve
EM-69
VALVE GUIDE
NCEM0031S04
Unit: mm (in)
SEM083D
Standard
Service
Valve guide
Outer diameter
Intake
10.023 - 10.034 (0.3946 - 0.3950)
10.223 - 10.234 (0.4025 - 0.4029)
Exhaust
10.023 - 10.034 (0.3946 - 0.3950)
10.223 - 10.234 (0.4025 - 0.4029)
Valve guide
Inner diameter (Finished size)
Intake
6.000 - 6.018 (0.2362 - 0.2369)
Exhaust
6.000 - 6.018 (0.2362 - 0.2369)
Cylinder head valve guide hole
diameter
Intake
9.975 - 9.996 (0.3927 - 0.3935)
10.175 - 10.196 (0.4006 - 0.4014)
Exhaust
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
Limit
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
0.2 (0.008)
Projection length “L”
14.0 - 14.2 (0.551 - 0.559)
VALVE SHIM CLEARANCE ADJUSTMENT
NCEM0031S06
Unit: mm (in)
SEM095D
Valve shim clearance (cold)
Intake & Exhaust
Less than 0.025 (0.001)
Shim thickness “T
1
”
T
1
±
0.025 (0.001)
SERVICE DATA AND SPECIFICATIONS (SDS)
Valve (Cont’d)
EM-70
AVAILABLE SHIM
NCEM0031S07
AEM236
Thickness mm (in)
Identification mark
2.800 (0.1102)
28
00
2.825 (0.1112)
28
25
2.850 (0.1122)
28
50
2.875 (0.1132)
28
75
2.900 (0.1142)
29
00
2.925 (0.1152)
29
25
2.950 (0.1161)
29
50
2.975 (0.1171)
29
75
3.000 (0.1181)
30
00
3.025 (0.1191)
30
25
3.050 (0.1201)
30
50
3.075 (0.1211)
30
75
3.100 (0.1220)
31
00
3.125 (0.1230)
31
25
3.150 (0.1240)
31
50
3.175 (0.1250)
31
75
3.200 (0.1260)
32
00
GI
MA
LC
EC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
SERVICE DATA AND SPECIFICATIONS (SDS)
Valve (Cont’d)
EM-71
VALVE SEAT
NCEM0031S05
Unit: mm (in)
SEM651DE
Standard
Service
Cylinder head seat recess diameter (D)
In.
35.000 - 35.016 (1.3780 - 1.3786)
35.500 - 35.516 (1.3976 - 1.3983)
Ex.
31.000 - 31.016 (1.2205 - 1.2211)
31.500 - 31.516 (1.2402 - 1.2408)
Valve seat interference fit
In.
0.064 - 0.096 (0.0025 - 0.0038)
Ex.
0.064 - 0.096 (0.0025 - 0.0038)
Valve seat outer diameter (d)
In.
35.080 - 35.096 (1.3811 - 1.3817)
35.580 - 35.596 (1.4008 - 1.4014)
Ex.
31.080 - 31.096 (1.2236 - 1.2242)
31.580 - 31.596 (1.2433 - 1.2439)
Depth (H)
In.
6.25 (0.2461)
Ex.
6.25 (0.2461)
Height (h)
6.2 - 6.3 (0.244 - 0.248)
5.4 - 5.5 (0.213 - 0.217)
SERVICE DATA AND SPECIFICATIONS (SDS)
Valve (Cont’d)
EM-72
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