2001 INFINITI QX4 service

ENGINE MECHANICAL
SECTION
EM
CONTENTS
PRECAUTIONS...............................................................3
Parts Requiring Angular Tightening .............................3
Liquid Gasket Application Procedure ..........................3
PREPARATION...............................................................4
Special Service Tools ..................................................4
Commercial Service Tools ...........................................6
NOISE, VIBRATION AND HARSHNESS (NVH)
TROUBLESHOOTING.....................................................8
NVH Troubleshooting - Engine Noise .........................9
OUTER COMPONENT PARTS.....................................10
Removal and Installation ...........................................10
TIGHTENING PROCEDURES...................................12
MEASUREMENT OF COMPRESSION PRESSURE....14
OIL PAN.........................................................................15
Components...............................................................15
Removal .....................................................................15
Installation ..................................................................18
TIMING CHAIN..............................................................20
Components...............................................................20
POSITION FOR APPLYING LIQUID GASKET............21
Removal .....................................................................23
Inspection...................................................................29
Installation ..................................................................29
OIL SEAL.......................................................................35
Replacement ..............................................................35
VALVE OIL SEAL.....................................................35
OIL SEAL INSTALLATION DIRECTION.....................36
FRONT OIL SEAL....................................................36
REAR OIL SEAL......................................................36
CYLINDER HEAD..........................................................38
Components...............................................................38
Removal .....................................................................39
Disassembly...............................................................41
Inspection...................................................................42
CYLINDER HEAD DISTORTION...............................42
CAMSHAFT VISUAL CHECK....................................42
CAMSHAFT RUNOUT..............................................42
CAMSHAFT CAM HEIGHT.......................................42
CAMSHAFT JOURNAL CLEARANCE........................42
CAMSHAFT END PLAY............................................43
CAMSHAFT SPROCKET RUNOUT...........................43
VALVE GUIDE CLEARANCE....................................43
VALVE GUIDE REPLACEMENT................................44
VALVE SEATS.........................................................45
REPLACING VALVE SEAT FOR SERVICE PARTS....45
VALVE DIMENSIONS...............................................46
VALVE SPRING.......................................................46
VALVE LIFTER........................................................46
Assembly ...................................................................47
Installation ..................................................................47
Valve Clearance.........................................................52
CHECKING.............................................................52
ADJUSTING............................................................54
ENGINE ASSEMBLY.....................................................57
Removal and Installation ...........................................57
REMOVAL...............................................................58
INSTALLATION........................................................60
CYLINDER BLOCK.......................................................61
Components...............................................................61
CYLINDER BLOCK HEATER....................................62
Removal and Installation ...........................................62
Disassembly...............................................................62
PISTON, CRANKSHAFT AND OIL JET......................62
Inspection...................................................................63
PISTON AND PISTON PIN CLEARANCE..................63
PISTON RING SIDE CLEARANCE............................64
PISTON RING END GAP..........................................64
CONNECTING ROD BEND AND TORSION...............65
CYLINDER BLOCK DISTORTION AND WEAR...........65
PISTON-TO-BORE CLEARANCE..............................66
CRANKSHAFT.........................................................67
BEARING CLEARANCE...........................................67
CONNECTING ROD BUSHING CLEARANCE
(SMALL END)
..........................................................70
DRIVE PLATE RUNOUT..........................................70
Assembly ...................................................................71
PISTON..................................................................71
OIL JET..................................................................71
CRANKSHAFT.........................................................71
REPLACEMENT OF PILOT CONVERTER.................74
DRIVE PLATE.........................................................74
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SERVICE DATA AND SPECIFICATIONS (SDS).........75
General Specifications ...............................................75
Compression Pressure ..............................................75
Cylinder Head ............................................................75
Valve ..........................................................................76
VALVE....................................................................76
VALVE CLEARANCE................................................76
AVAILABLE SHIMS..................................................76
VALVE SPRING.......................................................78
VALVE LIFTER........................................................78
VALVE GUIDE.........................................................79
Valve Seat..................................................................79
Camshaft and Camshaft Bearing ..............................80
Cylinder Block ............................................................81Piston, Piston Ring and Piston Pin ...........................82
AVAILABLE PISTON................................................82
PISTON RING.........................................................83
PISTON PIN............................................................83
Connecting Rod .........................................................83
Crankshaft..................................................................84
Available Main Bearing ..............................................85
UNDERSIZE............................................................85
Available Connecting Rod Bearing............................86
CONNECTING ROD BEARING.................................86
UNDERSIZE............................................................86
Miscellaneous Components.......................................86
BEARING CLEARANCE...........................................86
CONTENTS(Cont'd)
EM-2

Special Service ToolsNBEM0003The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool nameDescription
ST0501S000
(Ð)
Engine stand assembly
1 ST05011000
(Ð)
Engine stand
2 ST05012000
(Ð)
Base
NT042
Disassembling and assembling
KV10106500
(Ð)
Engine stand shaft
NT028
KV10117000
(J41262)
Engine sub-attachment
NT373
KV10117000 has been replaced with KV10117001
(KV10117000 is no longer in production, but it is
usable).
KV10117001
(Ð)
Engine sub-attachment
NT372
Installing on the cylinder block
ST10120000
(J24239-01)
Cylinder head bolt
wrench
NT583
Loosening and tightening cylinder head bolt
a: 13 (0.51) dia.
b: 12 (0.47)
c: 10 (0.39)
Unit: mm (in)
KV10116200
(J26336-A)
Valve spring compres-
sor
1 KV10115900
(J26336-20)
Attachment
NT022
Disassembling valve mechanism
PREPARATION
Special Service Tools
EM-4

Tool number
(Kent-Moore No.)
Tool nameDescription
(J39386)
Valve oil seal drift
NT024
Installing valve oil seal
KV101151S0
(J38972)
Lifter stopper set
1 KV10115110
(J38972-1)
Camshaft pliers
2 KV10115120
(J38972-2)
Lifter stopper
NT041
Changing shims
EM03470000
(J8037)
Piston ring compressor
NT044
Installing piston assembly into cylinder bore
ST16610001
(J23907)
Pilot bushing puller
NT045
Removing crankshaft pilot bushing
KV101111 0 0
(J37228)
Seal cutter
NT046
Removing steel oil pan and rear timing chain case
WS39930000
(Ð)
Tube presser
NT052
Pressing the tube of liquid gasket
KV10112100
(BT8653-A)
Angle wrench
NT014
Tightening bolts for bearing cap, cylinder head, etc.
GI
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PREPARATION
Special Service Tools (Cont'd)
EM-5

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
GI
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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