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ENGINE

EM
A

EM
SECTION
ENGINE MECHANICAL C

E
CONTENTS
QR25DE Removal and Installation of Drive Belt ....................14 . F
Removal and Installation of Drive Belt Auto-ten-
PRECAUTION .............................................. 3
. sioner ......................................................................15
.
Removal and Installation of Idler Pulley .................16 . G
PRECAUTIONS .................................................. 3
.
Precaution for Supplemental Restraint System AIR CLEANER FILTER ..................................... 18
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Removal and Installation ........................................18
.
SIONER" .................................................................. 3
. H
Precautions For High-Voltage System ..................... 3 . CAMSHAFT VALVE CLEARANCE .................. 19
Necessary for Steering Wheel Rotation After Bat- Camshaft Valve Clearance .....................................19
.
tery Disconnect ........................................................ 3
. I
COMPRESSION PRESSURE ........................... 22
Precaution for Draining Coolant ............................... 3 .
Compression Pressure ...........................................22
.
Precaution for Disconnecting Fuel Piping ................ 4 .
Precaution for Removal and Disassembly ............... 4 . ON-VEHICLE REPAIR ................................ 24
. J
Precaution for Inspection, Repair and Replace-
ment ......................................................................... 4
. AIR CLEANER AND AIR DUCT ....................... 24
Precaution for Assembly and Installation ................. 4 . Removal and Installation ........................................24
.
Parts Requiring Angular Tightening ......................... 4 . K
Precaution for Liquid Gasket .................................... 4 . INTAKE MANIFOLD ......................................... 25
Removal and Installation ........................................25
.
PREPARATION ........................................... 6
. L
EXHAUST MANIFOLD AND THREE WAY
PREPARATION .................................................. 6
. CATALYST ........................................................ 29
Special Service Tool ................................................ 6
. Removal and Installation ........................................29
.
Commercial Service Tool ......................................... 8
. M
OIL PAN AND OIL STRAINER ......................... 31
FUNCTION DIAGNOSIS ............................. 10
. Removal and Installation ........................................31
.
N
NOISE, VIBRATION, AND HARSHNESS IGNITION COIL ................................................. 34
(NVH) TROUBLESHOOTING ...........................10
. Removal and Installation ........................................34
.
NVH Troubleshooting - Engine Noise .................... 10 .
Use the Chart Below to Help You Find the Cause FUEL INJECTOR AND FUEL TUBE ................ 35 O
of the Symptom ...................................................... 11
. Removal and Installation ........................................35
.

ON-VEHICLE MAINTENANCE ................... 12
. ROCKER COVER ............................................. 38
Removal and Installation ........................................38
. P
SPARK PLUG ...................................................12
.
Removal and Installation ........................................ 12
.
CAMSHAFT ....................................................... 40
Removal and Installation ........................................40
.
DRIVE BELTS ...................................................14
. Inspection After Installation ....................................47
.
Checking Drive Belts .............................................. 14
. Valve Clearance .....................................................48
.
Tension Adjustment ............................................... 14
.

Revision: July 2008 EM-1 2009 Altima Hybrid
TIMING CHAIN ................................................. 51
. DISASSEMBLY AND ASSEMBLY ............ 75
Removal and Installation ....................................... 51
.
CYLINDER BLOCK .......................................... 75
.
OIL SEAL .......................................................... 59
. Disassembly and Assembly ................................... 75
.
Removal and Installation of Valve Oil Seal ............ 59
. Inspection After Disassembly ................................. 83
.
Removal and Installation of Front Oil Seal ............ 59
.
Removal and Installation of Rear Oil Seal ............. 60
. HOW TO SELECT PISTON AND BEARING ... 91
How to Select Piston and Bearing ......................... 91
.
CYLINDER HEAD ............................................. 62
.
Removal and Installation ....................................... 62
. SERVICE DATA AND SPECIFICATIONS
Disassembly and Assembly ................................... 64
. (SDS) .......................................................... 98
Inspection After Disassembly ................................ 66
.
SERVICE DATA AND SPECIFICATIONS
REMOVAL AND INSTALLATION .............. 71
. (SDS) ................................................................ 98
.
Standard and Limit ................................................. 98
.
ENGINE ASSEMBLY ........................................ 71
.
Removal and Installation ....................................... 71
.

Revision: July 2008 EM-2 2009 Altima Hybrid
PRECAUTIONS
< PRECAUTION > [QR25DE]

PRECAUTION A
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT EM
PRE-TENSIONER" INFOID:0000000004211221

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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