service INFINITI QX4 2001 Factory Service Manual

Tool number
(Kent-Moore No.)
Tool nameDescription
KV10117100
(J3647-A)
Heated oxygen sensor
wrench
NT379
Loosening or tightening heated oxygen sensor
For 22 mm (0.87 in) hexagon nut
KV10114400
(J38365)
Heated oxygen sensor
wrench
NT636
Loosening or tightening rear heated oxygen sensor
a: 22 mm (0.87 in)
KV10117700
(J44716)
Ring gear stopper
NT822
Removing and installing crankshaft pulley
Commercial Service ToolsNBEM0004
Tool number
(Kent-Moore No.)
Tool nameDescription
Spark plug wrench
NT047
Removing and installing spark plug
Valve seat cutter set
NT048
Finishing valve seat dimensions
Piston ring expander
NT030
Removing and installing piston ring
Valve guide drift
NT015
Removing and installing valve guide
Intake & Exhaust:
a = 9.5 mm (0.374 in) dia.
b = 5.5 mm (0.217 in) dia.
PREPARATION
Special Service Tools (Cont'd)
EM-6

Tool number
(Kent-Moore No.)
Tool nameDescription
Valve guide reamer
NT016
Reaming valve guide 1 or hole for oversize valve
guide 2
Intake & Exhaust:
d
1= 6.0 mm (0.236 in) dia.
d
2= 10.2 mm (0.402 in) dia.
(J-43897-18)
(J-43897-12)
Oxygen sensor thread
cleaner
AEM488
Reconditioning the exhaust system threads before
installing a new oxygen sensor (Use with anti-seize
lubricant shown below.)
a = J-43897-18 (18 mm dia.) for zirconia oxygen
sensor
b = J-43897-12 (12 mm dia.) for titania oxygen
sensor
Anti-seize lubricant
(Permatex 133AR or
equivalent meeting MIL
specification MIL-A-
907)
AEM489
Lubricating oxygen sensor thread cleaning tool
when reconditioning exhaust system threads
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PREPARATION
Commercial Service Tools (Cont'd)
EM-7

SEM938C
2. If it exceeds the limit, check valve to valve guide clearance.
a. Measure valve stem diameter and valve guide inner diameter.
b. Check that clearance is within specification.
Valve to valve guide clearance limit:
Intake 0.08 mm (0.0031 in)
Exhaust 0.1 mm (0.004 in)
c. If it exceeds the limit, replace valve or valve guide.
SEM008A
VALVE GUIDE REPLACEMENTNBEM0019S091. To remove valve guide, heat cylinder head to 110 to 130ÉC
(230 to 266ÉF) by soaking in heated oil.
SEM931C
2. Drive out valve guide with a press [under a 20 kN (2 ton, 2.2
US ton, 2.0 Imp ton) pressure] or hammer and suitable tool.
SEM932C
3. Ream cylinder head valve guide hole.
Valve guide hole diameter (for service parts):
10.175 - 10.196 mm (0.4006 - 0.4014 in)
SEM950E
4. Heat cylinder head to 110 to 130ÉC (230 to 266ÉF) and press
service valve guide onto cylinder head.
Projection ªLº:
12.6 - 12.8 mm (0.496 - 0.504 in)
5. Ream valve guide.
Finished size:
6.000 - 6.018 mm (0.2362 - 0.2369 in)
CYLINDER HEAD
Inspection (Cont'd)
EM-44

SEM934C
VALVE SEATSNBEM0019S10Check valve seats for any evidence of pitting at valve contact
surface, and reseat or replace if it has worn out excessively.
IBefore repairing valve seats, check valve and valve guide
for wear. If they have worn, replace them. Then correct
valve seat.
IUse both hands to cut uniformly.
SEM795A
REPLACING VALVE SEAT FOR SERVICE PARTSNBEM0019S111. Bore out old seat until it collapses. Boring should not continue
beyond the bottom face of the seat recess in cylinder head. Set
the machine depth stop to ensure this.
2. Ream cylinder head recess for service valve seat.
Oversize [0.5 mm (0.020 in)]:
Intake 38.500 - 38.516 mm (1.5157 - 1.5164 in)
Exhaust 32.700 - 32.716 mm (1.2874 - 1.2880 in)
Be sure to ream in circles concentric to the valve guide
center.
This will enable valve seat to fit correctly.
SEM892B
3. Heat cylinder head to 110 to 130ÉC (230 to 266ÉF) by soaking
in heated oil.
4. Press fit valve seat until it seats on the bottom.
5. Cut or grind valve seat using suitable tool to the specified
dimensions as shown in SDS (EM-79).
6. After cutting, lap valve seat with abrasive compound.
7. Check valve seating condition.
Seat face angle ªaº: 45É
Contacting width ªWº:
Intake 1.09 - 1.31 mm (0.0429 - 0.0516 in)
Exhaust 1.29 - 1.51 mm (0.0508 - 0.0594 in)
SEM621F
8. Use a depth gauge to measure the distance between the
mounting surface of the cylinder head spring seat and the
valve stem end. If the distance is shorter than specified, repeat
step 5 above to adjust it. If it is longer, replace the valve seat
with a new one.
Valve seat resurface limit ªLº:
Intake 41.07 - 41.67 mm (1.6169 - 1.6405 in)
Exhaust 41.00 - 41.60 mm (1.6142 - 1.6378 in)
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CYLINDER HEAD
Inspection (Cont'd)
EM-45

SEM843E
SEM321AA
PISTON-TO-BORE CLEARANCENBEM0027S061. Using a bore gauge, measure cylinder bore for wear, out-of-
round and taper.
Cylinder bore inner diameter
Grade No. Standard inner diameter Wear limit
No. 1 95.500 - 95.510 mm (3.7598 - 3.7602 in)
0.20 mm (0.0079 in) No. 2 95.510 - 95.520 mm (3.7602 - 3.7606 in)
No. 3 95.520 - 95.530 mm (3.7606 - 3.7610 in)
If it exceeds the limit, rebore all cylinders. Replace cylinder
block if necessary.
Out-of-round (X þ Y):
Limit 0.015 mm (0.0006 in)
Taper (AþBþC):
Limit 0.015 mm (0.0006 in)
2. Check for scratches and seizure. If seizure is found, hone it.
SEM451G
IIf both cylinder block and piston are replaced with new
ones, select piston of the same grade number punched on
cylinder block rear position. These numbers are punched
in either Arabic or Roman numerals.
SEM258C
3. Measure piston skirt diameter.
Piston diameter ªAº: Refer to SDS (EM-82).
Measuring point ªaº (Distance from the top):
41.0 mm (1.61 in)
4. Check that piston-to-bore clearance is within specification.
Piston-to-bore clearance ªBº:
0.010 - 0.030 mm (0.0004 - 0.0012 in)
5. Determine piston oversize according to amount of cylinder
wear.
Oversize pistons are available for service.
Refer to SDS (EM-82).
6. Cylinder bore size is determined by adding piston-to-bore
clearance to piston diameter ªAº.
Rebored size calculation: D = A+BþC
where,
D: Bored diameter
A: Piston diameter as measured
B: Piston-to-bore clearance
C: Honing allowance 0.02 mm (0.0008 in)
7. Install main bearing caps, and tighten to the specified torque.
Otherwise, cylinder bores may be distorted in final assembly.
CYLINDER BLOCK
Inspection (Cont'd)
EM-66

SEM845E
2. Install main bearing cap and bearing beam to cylinder block.
Tighten all bolts in correct order.
3. Measure inner diameters ªAº of each main bearing.
AEM033
4. Measure outer diameters ªDmº of each crankshaft main jour-
nal.
5. Calculate main bearing clearance.
Main bearing clearance = A þ Dm
Standard: 0.035 - 0.045 mm (0.0014 - 0.0018 in)
Limit: 0.065 mm (0.0026 in)
IIf it exceeds the limit, replace bearing.
IIf clearance cannot be adjusted using any standard bearing
grade, grind crankshaft journal and use undersized bearing.
SEM964
a. When grinding crankshaft journal, confirm that ªLº dimension in
fillet roll is more than the specified limit.
ªLº: 0.1 mm (0.004 in)
b. Refer to SDS for grinding crankshaft and available service
parts.
SEM451G
6. If crankshaft or cylinder block is replaced with a new one,
select thickness of main bearings as follows:
a. Grade number of each cylinder block main journal is punched
on the respective cylinder block. These numbers are punched
in either Arabic or Alphabet. Refer to SDS, EM-81.
If measured diameter is out of grade punched, decide suitable
grade using table in SDS.
SEM452G
b. Grade number of each crankshaft main journal is punched on
the respective crankshaft. These numbers are punched in
either Arabic or Alphabet. Refer to SDS, EM-84.
If measured diameter is out of grade punched, decide suitable
grade using table in SDS.
c. Select main bearing with suitable thickness according to the
following table.
Refer to ªSDSº, EM-85, for available main bearings.
CYLINDER BLOCK
Inspection (Cont'd)
EM-68

General SpecificationsNBEM0029
Cylinder arrangementV- 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 arrangementDOHC
Firing order1-2-3-4-5-6
Number of piston ringsCompression 2
Oil 1
Number of main bearings4
Compression ratio10.0
Compression PressureNBEM0030Unit: kPa (kg/cm2, psi)/300 rpm
Compression pressureStandard 1,275 (13.0, 185)
Minimum 981 (10.0, 142)
Differential limit between cylinders 98 (1.0, 14)
Cylinder number
SEM713A
Cylinder HeadNBEM0031Unit: mm (in)
Standard Limit
Head surface distortion Less than 0.03 (0.0012) 0.1 (0.004)
SEM949E
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SERVICE DATA AND SPECIFICATIONS (SDS)
General Specifications
EM-75

ValveNBEM0032VALVENBEM0032S01Unit: mm (in)
SEM188
Valve head diameter ªDºIntake 37.0 - 37.3 (1.4567 - 1.4685)
Exhaust 31.2 - 31.5 (1.228 - 1.240)
Valve length ªLºIntake 96.12 - 96.62 (3.7842 - 3.8039)
Exhaust 93.65 - 94.15 (3.6870 - 3.7067)
Valve stem diameter ªdºIntake 5.965 - 5.980 (0.2348 - 0.2354)
Exhaust 5.945 - 5.960 (0.2341 - 0.2346)
Valve seat angle ªaºIntake
45É15¢- 45É45¢
Exhaust
Valve margin ªTºIntake 1.15 - 1.45 (0.0453 - 0.0571)
Exhaust 1.45 - 1.75 (0.0571 - 0.0689)
Valve margin ªTº limitMore than 0.5 (0.020)
Valve stem end surface grinding limit Less than 0.2 (0.008)
VALVE CLEARANCENBEM0032S02Unit: 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 80ÉC (176ÉF)
AVAILABLE SHIMSNBEM0032S03
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
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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 SPRINGNBEM0032S04
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 LIFTERNBEM0032S05Unit: 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