Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Nissan Altima 2000-2005 Approved Nissan Altima 2002 EM
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B ENGINE
A
SECTION
ENGINE MECHANICAL
EM EM
C
D
E
CONTENTS
QR25DE INTAKE MANIFOLD ................................................ 16 . F
Removal and Installation ....................................... 16 .
PRECAUTIONS ......................................................... 4 . REMOVAL .......................................................... 16 .
Precautions for Draining Coolant ............................ 4 . INSPECTION AFTER REMOVAL ...................... 18 . G
Precautions for Disconnecting Fuel Piping ............. 4 . INSTALLATION .................................................. 18 .
Precautions for Removal and Disassembly ............ 4 . INSPECTION AFTER INSTALLATION .............. 20 .
Precautions for Inspection, Repair and Replace- EXHAUST MANIFOLD AND THREE WAY CATA-
ment ........................................................................ 4
. H
LYST ......................................................................... 21
.
Precautions for Assembly and Installation .............. 4 . Removal and Installation ....................................... 21 .
Parts Requiring Angular Tightening ........................ 4 . REMOVAL .......................................................... 21 .
Precautions for Liquid Gasket ................................. 5 . INSPECTION AFTER REMOVAL ...................... 22 . I
REMOVAL OF LIQUID GASKET SEALING ......... 5 . INSTALLATION .................................................. 22 .
LIQUID GASKET APPLICATION PROCEDURE 5 ..... OIL PAN AND OIL STRAINER ................................ 23 .
PREPARATION .......................................................... 6 . Removal and Installation ....................................... 23 . J
Special Service Tools .............................................. 6 . REMOVAL .......................................................... 23 .
Commercial Service Tools ....................................... 7 . INSPECTION AFTER REMOVAL ...................... 24 .
NOISE, VIBRATION, AND HARSHNESS (NVH) INSTALLATION .................................................. 24 .
TROUBLESHOOTING ............................................. 10 . K
INSPECTION AFTER INSTALLATION ............... 25 .
NVH Troubleshooting -- Engine Noise ................. 10 . IGNITION COIL ........................................................ 26 .
Use the Chart Below to Help You Find the Cause Removal and Installation ....................................... 26 .
of the Symptom. .....................................................11 . REMOVAL .......................................................... 26 . L
DRIVE BELTS .......................................................... 12. INSTALLATION .................................................. 26 .
Checking Drive Belts ............................................. 12 . SPARK PLUG .......................................................... 27 .
Tension Adjustment ............................................... 12 . Removal and Installation ....................................... 27 . M
Removal and Installation ....................................... 12 . REMOVAL .......................................................... 27 .
REMOVAL .......................................................... 12 . INSPECTION AFTER REMOVAL ...................... 27 .
INSTALLATION .................................................. 12 . INSTALLATION .................................................. 28 .
Removal and Installation of Auxiliary Drive Belt FUEL INJECTOR AND FUEL TUBE ....................... 29 .
Auto-tensioner ....................................................... 13
. Removal and Installation ....................................... 29 .
REMOVAL .......................................................... 13 . REMOVAL .......................................................... 29 .
INSTALLATION .................................................. 13 . INSTALLATION .................................................. 30 .
AIR CLEANER AND AIR DUCT .............................. 14 . INSPECTION AFTER INSTALLATION ............... 31 .
Removal and Installation ....................................... 14 . ROCKER COVER .................................................... 32 .
REMOVAL .......................................................... 14 . Removal and Installation ....................................... 32 .
INSTALLATION .................................................. 14 . REMOVAL .......................................................... 32 .
CHANGING THE AIR CLEANER ELEMENT ..... 15 . INSTALLATION .................................................. 32 .
CAMSHAFT ............................................................. 34 .
Removal and Installation ....................................... 34 .
REMOVAL .......................................................... 34 .
INSPECTION AFTER REMOVAL ...................... 36 .
EM-1
INSTALLATION ................................................... 39 . NAL .....................................................................87
.
Valve Clearance ..................................................... 41. OUTER DIAMETER OF CRANKSHAFT PIN .....87 .
INSPECTION ...................................................... 41 . OUT-OF-ROUND AND TAPER OF CRANK-
ADJUSTMENT ................................................... 43 . SHAFT ................................................................87
.
TIMING CHAIN ......................................................... 45 . CRANKSHAFT RUNOUT ...................................88 .
Removal and Installation ....................................... 45 . OIL CLEARANCE OF CONNECTING ROD
REMOVAL .......................................................... 46 . BEARING ............................................................88.
INSPECTION AFTER REMOVAL ....................... 48 . OIL CLEARANCE OF MAIN BEARING ..............88 .
INSTALLATION ................................................... 48 . CRUSH HEIGHT OF MAIN BEARING ...............89 .
CYLINDER HEAD .................................................... 53 . OUTER DIAMETER OF LOWER CYLINDER
On-Vehicle Service ................................................ 53 . BLOCK MOUNTING BOLT .................................89 .
CHECKING COMPRESSION PRESSURE ........ 53 . OUTER DIAMETER OF CONNECTING ROD
Removal and Installation ....................................... 54 . BOLT ...................................................................89
.
REMOVAL .......................................................... 54 . MOVEMENT AMOUNT OF FLYWHEEL (M/T
INSPECTION AFTER REMOVAL ....................... 55 . MODEL) ..............................................................90
.
INSTALLATION ................................................... 55 . SERVICE DATA AND SPECIFICATIONS (SDS) .....91 .
Disassembly and Assembly ................................... 57 . Standard and Limit .................................................91 .
DISASSEMBLY .................................................. 57 . GENERAL SPECIFICATIONS ............................91 .
ASSEMBLY ........................................................ 58 . INTAKE MANIFOLD AND EXHAUST MANI-
Inspection After Disassembly ................................ 58 . FOLD ..................................................................91
.
CYLINDER HEAD DISTORTION ....................... 58 . DRIVE BELTS .....................................................91 .
VALVE DIMENSIONS ......................................... 59 . CYLINDER HEAD ...............................................92 .
VALVE GUIDE CLEARANCE ............................. 59 . VALVE .................................................................92
.
VALVE GUIDE REPLACEMENT ........................ 59 . CAMSHAFT AND CAMSHAFT BEARING ..........95 .
VALVE SEAT CONTACT .................................... 60 . CYLINDER BLOCK .............................................95 .
VALVE SEAT REPLACEMENT .......................... 61 . PISTON, PISTON RING, AND PISTON PIN .......96 .
VALVE SPRING SQUARENESS ........................ 62 . CONNECTING ROD ...........................................97 .
VALVE SPRING DIMENSIONS AND VALVE CRANKSHAFT ....................................................98 .
SPRING PRESSURE LOAD .............................. 62 . MAIN BEARING ..................................................99 .
ENGINE ASSEMBLY ............................................... 63 . CONNECTING ROD BEARING ........................ 100 .
Removal and Installation ....................................... 63 .
REMOVAL .......................................................... 64 . VQ35DE
INSTALLATION ................................................... 65 .
INSPECTION AFTER INSTALLATION ............... 65 . PRECAUTIONS ...................................................... 101 .
CYLINDER BLOCK .................................................. 67 . Precautions for Draining Coolant ......................... 101 .
Disassembly and Assembly ................................... 67 . Precautions for Disconnecting Fuel Piping .......... 101 .
DISASSEMBLY .................................................. 68 . Precautions for Removal and Disassembly ......... 101 .
ASSEMBLY ........................................................ 70 . Precautions for Inspection, Repair and Replace-
How to Select Piston and Bearing ......................... 75 . ment ..................................................................... 101
.
DESCRIPTION ................................................... 75 . Precautions for Assembly and Installation ........... 101 .
HOW TO SELECT A PISTON ............................ 76 . Parts Requiring Angular Tightening ..................... 101 .
HOW TO SELECT A CONNECTING ROD BEAR- Precautions for Liquid Gasket .............................. 102 .
ING ..................................................................... 76
. REMOVAL OF LIQUID GASKET SEALING ..... 102 .
HOW TO SELECT A MAIN BEARING ............... 78 . LIQUID GASKET APPLICATION PROCEDURE.102
Inspection After Disassembly ................................ 81 . PREPARATION ...................................................... 103 .
CRANKSHAFT SIDE CLEARANCE ................... 81 . Special Service Tools ........................................... 103 .
CONNECTING ROD SIDE CLEARANCE .......... 82 . Commercial Service Tools ................................... 105 .
PISTON AND PISTON PIN CLEARANCE ......... 82 . NOISE, VIBRATION, AND HARSHNESS (NVH)
PISTON RING SIDE CLEARANCE .................... 83 . TROUBLESHOOTING ........................................... 107 .
PISTON RING END GAP ................................... 83 . NVH Troubleshooting -- Engine Noise ................ 107 .
CONNECTING ROD BEND AND TORSION ...... 84 . Use the Chart Below to Help You Find the Cause
CONNECTING ROD BEARING (BIG END) ....... 84 . of the Symptom. ................................................... 108 .
CONNECTING ROD BUSHING OIL CLEAR- DRIVE BELTS ......................................................... 109 .
ANCE (SMALL END) .......................................... 84 . Checking Drive Belts ............................................ 109 .
CYLINDER BLOCK DISTORTION ..................... 85 . AIR CLEANER AND AIR DUCT ............................ 110 .
INNER DIAMETER OF MAIN BEARING HOUS- Removal and Installation ...................................... 110 .
ING ..................................................................... 86
. REMOVAL ......................................................... 110 .
PISTON TO CYLINDER BORE CLEARANCE ... 86 INSTALLATION ................................................. 110 .
OUTER DIAMETER OF CRANKSHAFT JOUR- CHANGING AIR CLEANER ELEMENT ............ 110 .
EM-2
INTAKE MANIFOLD ...............................................112 . Disassembly and Assembly ................................. 176 .
Removal and Installation ......................................112 . DISASSEMBLY ................................................ 177 . A
REMOVAL .........................................................113 . ASSEMBLY ...................................................... 177 .
INSPECTION AFTER REMOVAL .....................114 . Inspection After Disassembly .............................. 178 .
INSTALLATION .................................................114 . CYLINDER HEAD DISTORTION ..................... 178 . EM
EXHAUST MANIFOLD AND THREE WAY CATA- VALVE GUIDE CLEARANCE ........................... 178 .
LYST .......................................................................116
. VALVE GUIDE REPLACEMENT ...................... 179 .
Removal and Installation ......................................116 . VALVE SEAT CONTACT .................................. 180 .
REMOVAL .........................................................117 . VALVE SEAT REPLACEMENT ........................ 180 . C
INSPECTION AFTER REMOVAL .....................118 . VALVE SPRING SQUARENESS ...................... 181 .
INSTALLATION .................................................119 . VALVE SPRING DIMENSIONS AND VALVE
OIL PAN ................................................................. 120
. SPRING PRESSURE LOAD ............................ 181 . D
Removal and Installation ..................................... 120 . ENGINE ASSEMBLY ............................................. 182 .
REMOVAL ........................................................ 120 . Removal and Installation ..................................... 182 .
INSTALLATION ................................................ 123 . REMOVAL ........................................................ 183 . E
IGNITION COIL ...................................................... 126 . INSTALLATION ................................................ 185 .
Removal and Installation ..................................... 126 . INSPECTION AFTER INSTALLATION ............. 185 .
REMOVAL ........................................................ 126 . CYLINDER BLOCK ............................................... 186 .
INSTALLATION ................................................ 126 . Disassembly and Assembly ................................. 186 . F
SPARK PLUG (PLATINUM-TIPPED TYPE) .......... 127 . DISASSEMBLY ................................................ 187 .
Removal and Installation ..................................... 127 . ASSEMBLY ...................................................... 189 .
REMOVAL ........................................................ 127 . Inspection ............................................................ 194
. G
INSPECTION AFTER REMOVAL .................... 128 . PISTON AND PISTON PIN CLEARANCE ....... 194 .
INSTALLATION ................................................ 128 . PISTON RING SIDE CLEARANCE .................. 195 .
FUEL INJECTOR AND FUEL TUBE ..................... 129 . PISTON RING END GAP ................................. 195 . H
Removal and Installation ..................................... 129 . CONNECTING ROD BEND AND TORSION ... 195 .
REMOVAL ........................................................ 129 . CONNECTING ROD BEARING (BIG END) ..... 196 .
INSTALLATION ................................................ 130 . CONNECTING ROD BUSHING OIL CLEAR-
I
INSPECTION AFTER INSTALLATION ............ 131 . ANCE (SMALL END) ........................................ 196 .
ROCKER COVER .................................................. 132 . CYLINDER BLOCK DISTORTION AND WEAR. 197
Removal and Installation ..................................... 132 . INNER DIAMETER OF MAIN BEARING HOUS-
REMOVAL ........................................................ 132 . ING ................................................................... 198
. J
INSTALLATION ................................................ 133 . PISTON-TO-BORE CLEARANCE .................... 198 .
CAMSHAFT ........................................................... 134 . CRANKSHAFT ................................................. 199 .
Removal and Installation ..................................... 134 . BEARING CLEARANCE .................................. 200 . K
REMOVAL ........................................................ 135 . CONNECTING ROD BUSHING CLEARANCE
INSTALLATION ................................................ 135 . (SMALL END) ................................................... 203 .
INSPECTION AFTER REMOVAL .................... 139 . DRIVE PLATE RUNOUT (A/T) ......................... 204 .
L
Valve Clearance .................................................. 141 . FLYWHEEL RUNOUT (M/T) ............................ 204 .
CHECKING ...................................................... 141 . SERVICE DATA AND SPECIFICATIONS (SDS) ... 206 .
ADJUSTING ..................................................... 144 . Standard and Limit ............................................... 206 .
TIMING CHAIN ...................................................... 146 . GENERAL SPECIFICATIONS .......................... 206 . M
Components ........................................................ 146 . CYLINDER HEAD ............................................ 207 .
POSITION FOR APPLYING LIQUID GASKET . 148 VALVE .............................................................. 207
.
Removal .............................................................. 149
. CAMSHAFT AND CAMSHAFT BEARING ....... 211 .
Inspection ............................................................ 155
. CYLINDER BLOCK .......................................... 211 .
Installation ........................................................... 155
. PISTON, PISTON RING AND PISTON PIN ..... 212 .
CYLINDER HEAD .................................................. 164 . CONNECTING ROD ........................................ 213 .
On-Vehicle Service .............................................. 164 . CRANKSHAFT ................................................. 214 .
CHECKING COMPRESSION PRESSURE ..... 164 . AVAILABLE MAIN BEARING ........................... 215 .
Removal and Installation ..................................... 165 . CONNECTING ROD BEARING ....................... 215 .
REMOVAL ........................................................ 165 . MISCELLANEOUS COMPONENTS ................ 216 .
INSTALLATION ................................................ 169 . BEARING CLEARANCE .................................. 216 .
EM-3
PRECAUTIONS
[QR25DE]
PRECAUTIONS PFP:00001
Precautions for Draining Coolant EBS007OM
q Drain coolant when engine is cooled.
Precautions for Disconnecting Fuel Piping EBS007ON
q Before starting work, make sure no fire or spark producing items are in the work area.
q Release fuel pressure before any removal or disassembly.
q After disconnecting pipes, plug openings to stop fuel leakage.
Precautions for Removal and Disassembly EBS007OO
q When instructed to use special service tools, use the specified tools. Always be careful to work safely,
avoid forceful operations.
q Use maximum care to avoid damage to mating or sliding surfaces.
q Cover openings of engine system with tape or equivalent, if necessary, to seal out foreign materials.
q Mark and arrange disassembly parts in an organized way for easy troubleshooting and assembly.
q When loosening nuts and bolts, as a basic rule, start with the one furthest outside, then the one diagonally
opposite, and so on. If the order of loosening is specified, follow the specifications.
Precautions for Inspection, Repair and Replacement EBS007OP
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 EBS007OQ
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-
fied, follow the specifications.
q Always replace the old with a 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
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.
q Bleed the air trapped within the system after draining the coolant.
q After repairing, start engine and increase engine speed to check coolant, fuel, oil, and exhaust systems
for leakage or rattles.
Parts Requiring Angular Tightening EBS007OR
q Use an angle wrench for the final tightening of the following engine parts.
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