Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti Q45 FY33 F50 2001-2006 Approved 2003_Q45 em

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ENGINE MECHANICAL

B ENGINE

EM
SECTION
ENGINE MECHANICAL C

E
CONTENTS
PRECAUTIONS ......................................................... 3 . INTAKE MANIFOLD ................................................ 17 . F
Precautions for Drain Engine Coolant ..................... 3 . Removal and Installation ....................................... 17 .
Precautions for Disconnecting Fuel Piping ............. 3 . REMOVAL .......................................................... 18 .
Precautions for Removal and Disassembly ............ 3 . INSPECTION AFTER REMOVAL ...................... 19 . G
Precautions for Inspection, Repair and Replace- INSTALLATION .................................................. 19 .
ment ........................................................................ 3
. INSPECTION AFTER INSTALLATION ............... 21 .
Precautions for Assembly and Installation .............. 3 . EXHAUST MANIFOLD AND THREE WAY CATA-
H
Parts Requiring Angular Tightening ........................ 3 . LYST ......................................................................... 22
.
Precautions for Liquid Gasket ................................. 4 . Removal and Installation ....................................... 22 .
REMOVAL OF LIQUID GASKET SEALING ......... 4 . REMOVAL .......................................................... 22 .
LIQUID GASKET APPLICATION PROCEDURE 4 ..... INSPECTION AFTER REMOVAL ...................... 23 . I
PREPARATION .......................................................... 5 . INSTALLATION .................................................. 23 .
Special Service Tools .............................................. 5 . OIL PAN AND OIL STRAINER ................................ 25 .
Commercial Service Tools ....................................... 7 . Removal and Installation ....................................... 25 . J
NOISE, VIBRATION AND HARSHNESS (NVH) REMOVAL .......................................................... 25 .
TROUBLESHOOTING ............................................... 9 . INSPECTION AFTER REMOVAL ...................... 26 .
NVH Troubleshooting --Engine Noise .................... 9 . INSTALLATION .................................................. 26 .
K
Use the Chart Below to Help You Find the Cause INSPECTION AFTER INSTALLATION ............... 27 .
of the Symptom. .................................................... 10 . IGNITION COIL ........................................................ 28 .
ENGINE ROOM COVER ..........................................11 . Removal and Installation ....................................... 28 .
Removal and Installation ........................................11 . REMOVAL .......................................................... 28 . L
REMOVAL ...........................................................11 . INSTALLATION .................................................. 28 .
INSTALLATION ...................................................11 . SPARK PLUG (PLATINUM-TIPPED TYPE) ............ 29 .
DRIVE BELTS .......................................................... 12. Removal and Installation ....................................... 29 . M
Checking Drive Belts ............................................. 12 . REMOVAL .......................................................... 29 .
Tension Adjustment ............................................... 12 . INSPECTION AFTER REMOVAL ...................... 29 .
Removal and Installation ....................................... 13 . INSTALLATION .................................................. 30 .
REMOVAL .......................................................... 13 . FUEL INJECTOR AND FUEL TUBE ....................... 31 .
INSTALLATION .................................................. 13 . Removal and Installation ....................................... 31 .
Drive Belt Auto Tensioner and Idler Pulley ............ 14 . REMOVAL .......................................................... 31 .
REMOVAL .......................................................... 14 . INSTALLATION .................................................. 32 .
INSTALLATION .................................................. 14 . INSPECTION AFTER INSTALLATION ............... 32 .
AIR CLEANER AND AIR DUCT .............................. 15 . ROCKER COVER .................................................... 33 .
Removal and Installation ....................................... 15 . Removal and Installation ....................................... 33 .
REMOVAL .......................................................... 15 . REMOVAL .......................................................... 33 .
INSTALLATION .................................................. 15 . INSTALLATION .................................................. 34 .
CHANGING AIR CLEANER FILTER .................. 16 .

Revision; 2004 April EM-1 2003 Q45
TIMING CHAIN ......................................................... 35
. DISASSEMBLY ...................................................74 .
Removal and Installation ....................................... 35 . ASSEMBLY .........................................................77 .
REMOVAL .......................................................... 36
. How to Select Piston and Bearing .........................81 .
INSPECTION AFTER REMOVAL ....................... 39 . DESCRIPTION ...................................................81 .
INSTALLATION ................................................... 39. HOW TO SELECT PISTON ................................82 .
CAMSHAFT .............................................................. 46
. HOW TO SELECT CONNECTING ROD BEAR-
Removal and Installation ....................................... 46 . ING ......................................................................83
.
REMOVAL .......................................................... 46
. HOW TO SELECT MAIN BEARING ...................84 .
INSTALLATION ................................................... 47. Inspection After Disassembly .................................87 .
INSPECTION AFTER REMOVAL ....................... 49 . CRANKSHAFT END PLAY .................................87 .
Valve Clearance ..................................................... 52
. CONNECTING ROD SIDE CLEARANCE ..........88 .
INSPECTION ...................................................... 52
. PISTON AND PISTON PIN CLEARANCE ..........88 .
ADJUSTMENT ................................................... 54 . PISTON RING SIDE CLEARANCE ....................89 .
OIL SEAL ................................................................. 57
. PISTON RING END GAP ...................................89 .
Removal and Installation of Valve Oil Seal ............ 57 . CONNECTING ROD BEND AND TORSION ......90 .
REMOVAL .......................................................... 57
. CONNECTING ROD BEARING (BIG END) .......90 .
INSTALLATION ................................................... 57. CONNECTING ROD BUSHING OIL CLEAR-
Removal and Installation of Front Oil Seal ............ 58 . ANCE (SMALL END) ..........................................90 .
REMOVAL .......................................................... 58
. CYLINDER BLOCK DISTORTION .....................91 .
INSTALLATION ................................................... 58. INNER DIAMETER OF MAIN BEARING HOUS-
Removal and Installation of Rear Oil Seal ............. 60 . ING ......................................................................92
.
REMOVAL .......................................................... 60
. PISTON TO CYLINDER BORE CLEARANCE ...92
INSTALLATION ................................................... 60. OUTER DIAMETER OF CRANKSHAFT JOUR-
CYLINDER HEAD .................................................... 61 . NAL .....................................................................93
.
On-Vehicle Service ................................................ 61
. OUTER DIAMETER OF CRANKSHAFT PIN .....94 .
CHECKING COMPRESSION PRESSURE ........ 61 . OUT-OF-ROUND AND TAPER OF CRANK-
Removal and Installation ....................................... 62 . SHAFT ................................................................94
.
REMOVAL .......................................................... 62
. CRANKSHAFT RUNOUT ...................................94 .
INSPECTION AFTER REMOVAL ....................... 63 . OIL CLEARANCE OF CONNECTING ROD
INSTALLATION ................................................... 63. BEARING ............................................................94 .
Disassembly and Assembly ................................... 64 . OIL CLEARANCE OF MAIN BEARING ..............95 .
DISASSEMBLY .................................................. 64 . CRUSH HEIGHT OF MAIN BEARING ...............96 .
ASSEMBLY ........................................................ 65
. SERVICE DATA AND SPECIFICATIONS (SDS) .....97 .
Inspection After Disassembly ................................ 66 . Standard and Limit .................................................97 .
CYLINDER HEAD DISTORTION ....................... 66 . GENERAL SPECIFICATIONS ............................97 .
VALVE DIMENSIONS ......................................... 66 . DRIVE BELTS .....................................................97 .
VALVE GUIDE CLEARANCE ............................. 66 . INTAKE MANIFOLD AND EXHAUST MANI-
VALVE GUIDE REPLACEMENT ........................ 66 . FOLD ..................................................................97
.
VALVE SEAT CONTACT .................................... 68 . SPARK PLUG (PLATINUM-TIPPED TYPE) .......98 .
VALVE SEAT REPLACEMENT .......................... 68 . CYLINDER HEAD ...............................................98 .
VALVE SPRING SQUARENESS ........................ 69 . VALVE .................................................................98
.
VALVE SPRING DIMENSIONS AND VALVE CAMSHAFT AND CAMSHAFT BEARING ........ 102 .
SPRING PRESSURE LOAD .............................. 69 . CYLINDER BLOCK ........................................... 102 .
ENGINE ASSEMBLY ............................................... 70 . PISTON, PISTON RING AND PISTON PIN ..... 103 .
Removal and Installation ....................................... 70 . CONNECTING ROD ......................................... 104 .
REMOVAL .......................................................... 70
. CRANKSHAFT .................................................. 105 .
INSTALLATION ................................................... 72. MAIN BEARING ................................................ 106 .
INSPECTION AFTER INSTALLATION ............... 72 . CONNECTING ROD BEARING ........................ 107 .
CYLINDER BLOCK .................................................. 73 . Tightening Torque ................................................ 108 .
Disassembly and Assembly ................................... 73 .

Revision; 2004 April EM-2 2003 Q45
PRECAUTIONS

PRECAUTIONS PFP:00001
A
Precautions for Drain Engine Coolant EBS002QC

Drain engine coolant when engine is cooled.
EM
Precautions for Disconnecting Fuel Piping EBS002QD

q Before starting work, make sure no fire or spark producing items are in the work area.
q Release fuel pressure before disconnecting and disassembly. C
q After disconnecting pipes, plug openings to stop fuel leakage.
Precautions for Removal and Disassembly EBS002QE
D
q When instructed to use special service tools, use the specified tools. Always be careful to work safely,
avoid forceful or uninstructed operations.
q Exercise maximum care to avoid damage to mating or sliding surfaces. E
q Cover openings of engine system with tape or the equivalent, if necessary, to seal out foreign materials.
q Mark and arrange disassembly parts in an organized way for easy troubleshooting and re-assembly.
q When loosening nuts and bolts, as a basic rule, start with the one furthest outside, then the one diagonally F
opposite, and so on. If the order of loosening is specified, do exactly as specified. Power tools may be
used where noted in the step.
Precautions for Inspection, Repair and Replacement EBS002QF G
Before repairing or replacing, thoroughly inspect parts. Inspect new replacement parts in the same way, and
replace if necessary.
H
Precautions for Assembly and Installation EBS002QG

q Use torque wrench to tighten bolts or nuts to specification.
q When tightening nuts and bolts, as a basic rule, equally tighten in several different steps starting with the I
ones in center, then ones on inside and outside diagonally in this order. If the order of tightening is speci-
fied, do exactly as specified.
q Replace with new liquid gasket, packing, oil seal or O-ring. J
q Thoroughly wash, clean, and air-blow each part. Carefully check engine oil or engine coolant passages for
any restriction and blockage.
q Avoid damaging sliding or mating surfaces. Completely remove foreign materials such as cloth lint or dust. K
Before assembly, engine oil sliding surfaces well.
q Release air within route when refilling after draining engine coolant.
q After repairing, start engine and increase engine speed to check engine coolant, fuel, engine oil, and L
exhaust systems for leakage.
Parts Requiring Angular Tightening EBS001LP
M
q Use an angle wrench for the final tightening of the following engine parts:

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