Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti Q45 FY33 F50 2001-2006 Approved 2002_Q45 em

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ENGINE MECHANICAL

B ENGINE

SECTION
ENGINE MECHANICAL
EM EM

E
CONTENTS
PRECAUTIONS ......................................................... 3 . INTAKE MANIFOLD ................................................ 17 . F
Precautions for Drain 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 ....................................... 12 . INSTALLATION .................................................. 29 .
REMOVAL .......................................................... 12 . FUEL INJECTOR AND FUEL TUBE ....................... 30 .
INSTALLATION .................................................. 13 . Removal and Installation ....................................... 30 .
Drive Belt Auto Tensioner and Idler Pulley ............ 14 . REMOVAL .......................................................... 30 .
REMOVAL .......................................................... 14 . INSTALLATION .................................................. 31 .
INSTALLATION .................................................. 14 . INSPECTION AFTER INSTALLATION ............... 31 .
AIR CLEANER AND AIR DUCT .............................. 15 . ROCKER COVER .................................................... 32 .
Removal and Installation ....................................... 15 . Removal and Installation ....................................... 32 .
REMOVAL .......................................................... 15 . REMOVAL .......................................................... 32 .
INSTALLATION .................................................. 15 . INSTALLATION .................................................. 33 .
CHANGING AIR CLEANER ELEMENT ............. 16 . CAMSHAFT ............................................................. 34 .
Removal and Installation ....................................... 34 .
REMOVAL .......................................................... 35 .
INSTALLATION .................................................. 35 .

Revision; 2004 April EM-1 2002 Q45
INSPECTION AFTER REMOVAL ....................... 38 . HOW TO SELECT MAIN BEARING ...................78 .
Valve Clearance ..................................................... 40. Inspection After Disassembly .................................81 .
INSPECTION ...................................................... 40 . CRANKSHAFT SIDE CLEARANCE ...................81 .
ADJUSTMENT ................................................... 42 . CONNECTING ROD SIDE CLEARANCE ..........82 .
TIMING CHAIN ......................................................... 45 . PISTON AND PISTON PIN CLEARANCE ..........82 .
Removal and Installation ....................................... 45 . PISTON RING SIDE CLEARANCE ....................83 .
REMOVAL .......................................................... 46 . PISTON RING END DAP ....................................83 .
INSPECTION AFTER REMOVAL ....................... 48 . CONNECTING ROD BEND AND TORSION ......84 .
INSTALLATION ................................................... 49 . CONNECTING ROD BEARING (BIG END) .......84 .
CYLINDER HEAD .................................................... 55 . CONNECTING ROD BUSHING OIL CLEAR-
On-Vehicle Service ................................................ 55 . ANCE (SMALL END) ..........................................84 .
CHECKING COMPRESSION PRESSURE ........ 55 . CYLINDER BLOCK DISTORTION .....................85 .
Removal and Installation ....................................... 56 . INNER DIAMETER OF MAIN BEARING HOUS-
REMOVAL .......................................................... 56 . ING ......................................................................86
.
INSPECTION AFTER REMOVAL ....................... 57 . PISTON TO CYLINDER BORE CLEARANCE ...86
INSTALLATION ................................................... 57 . OUTER DIAMETER OF CRANKSHAFT JOUR-
Disassembly and Assembly ................................... 58 . NAL .....................................................................87
.
DISASSEMBLY .................................................. 58 . OUTER DIAMETER OF CRANKSHAFT PIN .....87 .
ASSEMBLY ........................................................ 59 . OUT-OF-ROUND AND TAPER OF CRANK-
Inspection After Disassembly ................................ 59 . SHAFT ................................................................88
.
CYLINDER HEAD DISTORTION ....................... 59 . CRANKSHAFT RUNOUT ...................................88 .
VALVE GUIDE CLEARANCE ............................. 60 . OIL CLEARANCE OF CONNECTING ROD
VALVE GUIDE REPLACEMENT ........................ 60 . BEARING ............................................................88 .
VALVE SEAT CONTACT .................................... 61 . OIL CLEARANCE OF MAIN BEARING ..............89 .
VALVE SEAT REPLACEMENT .......................... 61 . CRUSH HEIGHT OF MAIN BEARING ...............89 .
VALVE SPRING SQUARENESS ........................ 62 . SERVICE DATA AND SPECIFICATIONS (SDS) .....90 .
VALVE SPRING DIMENSIONS AND VALVE Standard and Limit .................................................90 .
SPRING PRESSURE LOAD .............................. 63 . GENERAL SPECIFICATIONS ............................90 .
ENGINE ASSEMBLY ............................................... 64 . INTAKE MANIFOLD AND EXHAUST MANI-
Removal and Installation ....................................... 64 . FOLD ..................................................................90
.
REMOVAL .......................................................... 65 . DRIVE BELTS .....................................................90 .
INSTALLATION ................................................... 66 . CYLINDER HEAD ...............................................91 .
INSPECTION AFTER INSTALLATION ............... 66 . VALVE .................................................................91
.
CYLINDER BLOCK .................................................. 67 . CAMSHAFT AND CAMSHAFT BEARING ..........95 .
Disassembly and Assembly ................................... 67 . CYLINDER BLOCK .............................................95 .
DISASSEMBLY .................................................. 68 . PISTON, PISTON RING AND PISTON PIN .......96 .
ASSEMBLY ........................................................ 71 . CONNECTING ROD ...........................................97 .
How to Select Piston and Bearing ......................... 75 . CRANKSHAFT ....................................................98 .
DESCRIPTION ................................................... 75 . MAIN BEARING ..................................................99 .
HOW TO SELECT PISTON ................................ 76 . CONNECTING ROD BEARING ........................ 100 .
HOW TO SELECT CONNECTING ROD BEAR- Tightening Torque ................................................ 101 .
ING ..................................................................... 77
.

Revision; 2004 April EM-2 2002 Q45
PRECAUTIONS

PRECAUTIONS PFP:00001
A
Precautions for Drain Coolant EBS002QC

q Drain 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 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.
Precautions for Inspection, Repair and Replacement EBS002QF
G
q Before repairing or replacing, thoroughly inspect parts. Inspect new replacement parts in the same way,
and replace if necessary.
Precautions for Assembly and Installation EBS002QG H
q Use torque wrench to tighten bolts or nuts.
q When tightening nuts and bolts, as a basic rule, equally tighten in several different steps starting with the
ones in center, then ones on inside and outside diagonally in this order. If the order of tightening is speci- I
fied, do exactly as specified.
q Replace with new gasket, packing, oil seal or O-ring.
q Thoroughly wash, clean, and air-blow each part. Carefully check oil or coolant passages for any restriction J
and blockage.
q Avoid damaging sliding or mating surfaces. Completely remove foreign materials such as cloth lint or dust.
Before assembly, oil sliding surfaces well. K
q Release air within route after draining coolant.
q After repairing, start engine and increase engine speed to check coolant, fuel, oil, and exhaust systems
for leakage. L

Parts Requiring Angular Tightening EBS001LP

q Use an angle wrench for the final tightening of the following engine parts: M

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