Infiniti QX4 (R50). Manual — part 429
General Specifications
NBEM0029
Cylinder arrangement
V-6
Displacement
cm
3
(cu in)
3,498 (213.45)
Bore and stroke
mm (in)
95.5 x 81.4 (3.760 x 3.205)
Valve arrangement
DOHC
Firing order
1-2-3-4-5-6
Number of piston rings
Compression
2
Oil
1
Number of main bearings
4
Compression ratio
10.0
Compression Pressure
NBEM0030
Unit: kPa (kg/cm
2
, psi)/300 rpm
Compression pressure
Standard
1,275 (13.0, 185)
Minimum
981 (10.0, 142)
Differential limit between cylinders
98 (1.0, 14)
Cylinder number
SEM713A
Cylinder Head
NBEM0031
Unit: mm (in)
Standard
Limit
Head surface distortion
Less than 0.03 (0.0012)
0.1 (0.004)
SEM949E
GI
MA
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
SERVICE DATA AND SPECIFICATIONS (SDS)
General Specifications
EM-75
Valve
NBEM0032
VALVE
NBEM0032S01
Unit: mm (in)
SEM188
Valve head diameter “D”
Intake
37.0 - 37.3 (1.4567 - 1.4685)
Exhaust
31.2 - 31.5 (1.228 - 1.240)
Valve length “L”
Intake
96.12 - 96.62 (3.7842 - 3.8039)
Exhaust
93.65 - 94.15 (3.6870 - 3.7067)
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
1.15 - 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
NBEM0032S02
Unit: mm (in)
Cold
Hot* (reference data)
Intake
0.26 - 0.34 (0.010 - 0.013)
0.304 - 0.416 (0.012 - 0.016)
Exhaust
0.29 - 0.37 (0.011 - 0.015)
0.308 - 0.432 (0.012 - 0.017)
*: Approximately 80°C (176°F)
AVAILABLE SHIMS
NBEM0032S03
Thickness
mm (in)
Identification mark
2.32 (0.0913)
232
2.33 (0.0917)
233
2.34 (0.0921)
234
2.35 (0.0925)
235
2.36 (0.0929)
236
2.37 (0.0933)
237
2.38 (0.0937)
238
2.39 (0.0941)
239
2.40 (0.0945)
240
2.41 (0.0949)
241
SERVICE DATA AND SPECIFICATIONS (SDS)
Valve
EM-76
Thickness
mm (in)
Identification mark
2.42 (0.0953)
242
2.43 (0.0957)
243
2.44 (0.0961)
244
2.45 (0.0965)
245
2.46 (0.0969)
246
2.47 (0.0972)
247
2.48 (0.0976)
248
2.49 (0.0980)
249
2.50 (0.0984)
250
2.51 (0.0988)
251
2.52 (0.0992)
252
2.53 (0.0996)
253
2.54 (0.1000)
254
2.55 (0.1004)
255
2.56 (0.1008)
256
2.57 (0.1012)
257
2.58 (0.1016)
258
2.59 (0.1020)
259
2.60 (0.1024)
260
2.61 (0.1028)
261
2.62 (0.1031)
262
2.63 (0.1035)
263
2.64 (0.1039)
264
2.65 (0.1043)
265
2.66 (0.1047)
266
2.67 (0.1051)
267
2.68 (0.1055)
268
2.69 (0.1059)
269
2.70 (0.1063)
270
2.71 (0.1067)
271
2.72 (0.1071)
272
2.73 (0.1075)
273
2.74 (0.1079)
274
2.75 (0.1083)
275
2.76 (0.1087)
276
2.77 (0.1091)
277
2.78 (0.1094)
278
2.79 (0.1098)
279
2.80 (0.1102)
280
2.81 (0.1106)
281
GI
MA
LC
EC
FE
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
SERVICE DATA AND SPECIFICATIONS (SDS)
Valve (Cont’d)
EM-77
Thickness
mm (in)
Identification mark
2.82 (0.1110)
282
2.83 (0.1114)
283
2.84 (0.1118)
284
2.85 (0.1122)
285
2.86 (0.1126)
286
2.87 (0.1130)
287
2.88 (0.1134)
288
2.89 (0.1138)
289
2.90 (0.1142)
290
2.91 (0.1146)
291
2.92 (0.1150)
292
2.93 (0.1154)
293
2.94 (0.1157)
294
2.95 (0.1161)
295
SEM966E
VALVE SPRING
NBEM0032S04
Free height
mm (in)
47.10 (1.8543)
Pressure
N (kg, lb) at height mm (in)
Standard
202 (20.6, 45.4) at 37.0 (1.457)
Limit
436 (44.5, 98.1) at 28.2 (1.110)
Out-of-square
mm (in)
Less than 2.0 (0.079)
VALVE LIFTER
NBEM0032S05
Unit: mm (in)
Valve lifter outer diameter
34.960 - 34.975 (1.3764 - 1.3770)
Lifter guide inner diameter
35.000 - 35.021 (1.3780 - 1.3788)
Clearance between lifter and lifter guide
0.025 - 0.061 (0.0010 - 0.0024)
SERVICE DATA AND SPECIFICATIONS (SDS)
Valve (Cont’d)
EM-78
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