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ENGINE

SECTION
ENGINE MECHANICAL
EM EM

E
CONTENTS
QR25DE Removal and Installation of Drive Belt Auto-ten- F
sioner ......................................................................16
.
PRECAUTION .............................................. 3
.
AIR CLEANER FILTER ..................................... 17
G
PRECAUTIONS .................................................. 3
. Removal and Installation ........................................17
.
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- CAMSHAFT VALVE CLEARANCE .................. 18
SIONER" .................................................................. 3
. Camshaft valve clearence ......................................18
. H
Precautions For High-Voltage System ..................... 3 .
COMPRESSION PRESSURE ........................... 21
Precaution for Draining Coolant ............................... 3 .
Compression pressure ...........................................21
.
Precaution for Disconnecting Fuel Piping ................ 3 . I
Precaution for Removal and Disassembly ............... 3 . ON-VEHICLE REPAIR ................................ 23
.
Precaution for Inspection, Repair and Replace-
ment ......................................................................... 3
. AIR CLEANER AND AIR DUCT ....................... 23 J
Precaution for Assembly and Installation ................. 3 . Removal and Installation ........................................23
.
Parts Requiring Angular Tightening ......................... 4 .
Precaution for Liquid Gasket .................................... 4 . INTAKE MANIFOLD ......................................... 24
Removal and Installation ........................................24
. K
PREPARATION ........................................... 6
.
EXHAUST MANIFOLD AND THREE WAY
PREPARATION .................................................. 6
. CATALYST ........................................................ 28 L
Special Service Tool ................................................ 6
. Removal and Installation ........................................28
.
Commercial Service Tool ......................................... 8
.
OIL PAN AND OIL STRAINER ......................... 30
FUNCTION DIAGNOSIS ............................. 11
. Removal and Installation ........................................30
. M

NOISE, VIBRATION, AND HARSHNESS IGNITION COIL ................................................. 33
(NVH) TROUBLESHOOTING ...........................11
. Removal and Installation ........................................33
.
N
NVH Troubleshooting - Engine Noise .................... 11 .
Use the Chart Below to Help You Find the Cause FUEL INJECTOR AND FUEL TUBE ................ 34
of the Symptom ...................................................... 12
. Removal and Installation ........................................34
.
O
ON-VEHICLE MAINTENANCE ................... 13
. ROCKER COVER ............................................. 37
Removal and Installation ........................................37
.
SPARK PLUG ...................................................13
.
CAMSHAFT ....................................................... 39 P
Removal and Installation ........................................ 13
.
Removal and Installation ........................................39
.
DRIVE BELTS ...................................................15
. Inspection After Installation ....................................46
.
Checking Drive Belts .............................................. 15
. Valve Clearance .....................................................47
.
Tension Adjustment ............................................... 15
.
Removal and Installation ........................................ 15
.
TIMING CHAIN .................................................. 50
Removal and Installation ........................................50
.

Revision: August 2007 EM-1 2008 Altima Hybrid
OIL SEAL .......................................................... 59
. DISASSEMBLY AND ASSEMBLY ............ 74
Removal and Installation of Valve Oil Seal ............ 59
.
Removal and Installation of Front Oil Seal ............ 59
. CYLINDER BLOCK .......................................... 74
.
Removal and Installation of Rear Oil Seal ............. 60
. Disassembly and Assembly ................................... 74
.
Inspection After Disassembly ................................. 82
.
CYLINDER HEAD ............................................. 62
.
Removal and Installation ....................................... 62
. HOW TO SELECT PISTON AND BEARING ... 90
Disassembly and Assembly ................................... 64
. How to Select Piston and Bearing ......................... 90
.
Inspection After Disassembly ................................ 66
.
SERVICE DATA AND SPECIFICATIONS
REMOVAL AND INSTALLATION .............. 70
. (SDS) .......................................................... 97
ENGINE ASSEMBLY ........................................ 70
. SERVICE DATA AND SPECIFICATIONS
Removal and Installation ....................................... 70
. (SDS) ................................................................ 97
.
Standard and Limit ................................................. 97
.

Revision: August 2007 EM-2 2008 Altima Hybrid
PRECAUTIONS
< PRECAUTION > [QR25DE]

PRECAUTION A
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT EM
PRE-TENSIONER" INFOID:0000000003068995

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along C
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted. D
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING: E

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