Engine Mechanical (QR25DE): Specifications — Nissan Sentra B15 (1998-2006)

Parts Requiring Angular Tightening

Use an angle wrench for the final tightening of the following engine parts. Cylinder head bolts Lower cylinder block bolts Connecting rod cap bolts Crankshaft pulley bolt (No angle wrench is required as the bolt flange is provided with notches for angular tightening)
Do not use a torque value for final tightening.
The torque value for these parts are for a preliminary step.
Ensure thread and seat surfaces are clean and coated with engine oil.

GENERAL SPECIFICATIONS

General Specifications Table Cylinder arrangement 4 in-line Displacement cm 3 (cu in) 2,488 (151.82) Bore and stroke mm (in) 89.0 x 100 (3.50 - 3.94) Valve arrangement DOHC Firing order 1-3-4-2 Number of piston rings Compression 2 Oil 1 Compression ratio 9.5 Compression pressure kPa (kg/cm 2 , psi) / 250 rpm Standard 1,250 (12.8, 182) Minimum 1,060 (10.8,154) Differential limit between cylinders 100 (1.0, 14) Valve timing Unit: degree a b C d e f 224 244 0 64 3 41

Scheme 1

Scheme 1: GENERAL SPECIFICATIONS

Scheme 2

Scheme 2: INTAKE MANIFOLD AND EXHAUST MANIFOLD

Scheme 3

Scheme 3: DRIVE BELTS

Scheme 4

Scheme 4: CYLINDER HEAD

Scheme 5

Scheme 5: VALVE

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

Scheme 13

Scheme 13: CAMSHAFT AND CAMSHAFT BEARING

Scheme 14

Scheme 14: CYLINDER BLOCK

Scheme 15

Scheme 15: PISTON, PISTON RING, AND PISTON PIN

Scheme 16

Scheme 17

Scheme 18

Scheme 18: CONNECTING ROD

Scheme 19

Scheme 19: CRANKSHAFT

Scheme 20

Scheme 21

Scheme 21: MAIN BEARING

Scheme 22

Scheme 23

Scheme 24

Scheme 25

Scheme 25: CONNECTING ROD BEARING

Scheme 26

Scheme 27

ENGINE SPECIFICATIONS

Application	Specification
Displacement	151.8 Cu. In. (2.5L)
Bore	3.50 In. (89 mm)
Stroke	3.94 In. (100 mm)
Compression Pressure	154-181 psi (10.8-12.8 kg/cm 2 )
Compression Ratio	9.5:1
Fuel System	SFI

GENERAL SPECIFICATIONS

VALVE CLEARANCE SPECIFICATIONS

Application		In. (mm)
Cold
Exhaust		.010-.013 (.26-.34)
Intake		.009-.013 (.24-.32)
Hot
Exhaust		.013-.016 (.33-.41)
Intake		.013-.016 (.32-.40)

VALVE CLEARANCE SPECIFICATIONS

MAIN BEARING SPECIFICATIONS (MATCHED SET)

Grade Number (1)	ID Color (2)	Thickness - In. (mm)
0	Black	.0777-.0778 (1.973-1.976)
1	Red (Brown)	.0778-.0779 (1.976-1.979)
2	Green	.0779-.0780 (1.979-1.982)
3	Yellow	.0780-.0781 (1.982-1.985)
4	Blue	.0781-.0783 (1.985-1.988)
5	Pink	.0783-.0784 (1.988-1.991)
6	Purple	.0784-.0785 (1.991-1.994)
7	Orange (White)	.0785-.0786 (1.994-1.997)
(1) Grade is the same for lower and upper bearings. (2) Color Mark in parenthesis are for 2004 model.

(1)	Grade is the same for lower and upper bearings.

(2)	Color Mark in parenthesis are for 2004 model.

MAIN BEARING SPECIFICATIONS (MATCHED SET)

MAIN BEARING SPECIFICATIONS (MISMATCHED SET)

Grade Number (1)	ID Color (2)	Thickness - In. (mm)
01
Lower	Black/Red (Black/Brown)	.0778-.0779 (1.976-1.979)
Upper	Black/Red	.0777-.0778 (1.973-1.976)
12
Lower	Red/Green	.0779-.0782 (1.979-1.982)
Upper	Red/Green	.0778-.0779 (1.976-1.979)
23
Lower	Green/Yellow	.0780-.0781 (1.982-1.985)
Upper	Green/Yellow	.0779-.0782 (1.979-1.982)
34
Lower	Yellow/Blue	.0793-.0794 (1.985-1.988)
Upper	Yellow/Blue	.0780-.0781 (1.982-1.985)
45
Lower	Blue/Pink	.0783-.0784 (1.988-1.991)
Upper	Blue/Pink	.0793-.0794 (1.985-1.988)
56
Lower	Pink/Purple	.0784-.0785 (1.991-1.994)
Upper	Pink/Purple	.0783-.0784 (1.988-1.991)
67
Lower	Purple/Orange (Purple/White)	.0785-.0786 (1.994-1.997)
Upper	Purple/Orange	.0784-.0785 (1.991-1.994)
(1) Grade is different for lower and upper bearings. (2) Color mark in parenthesis is 2004 model.

(1)	Grade is different for lower and upper bearings.

(2)	Color mark in parenthesis is 2004 model.

MAIN BEARING SPECIFICATIONS (MISMATCHED SET)

CONNECTING ROD BEARING SPECIFICATIONS

Grade Number	ID Color (1)	Thickness - In. (mm)
0	Black	.0590-.0589 (1.499-1.495)
1	Brown (Red)	.0592-.0590 (1.503-1.499)
2	Green	.0593-.0592 (1.507-1.503)
3	Yellow	.0595-.0593 (1.511-1.507)
(1) Color mark in parenthesis is for 2004 model.

(1)	Color mark in parenthesis is for 2004 model.

CONNECTING ROD BEARING SPECIFICATIONS

OIL PUMP SPECIFICATIONS

Application	In. (mm)
Pump Body-To-Outer Rotor Clearance	.0045-.0070 (.114-.179)
Rotor Tip Clearance	Less Than .0087 (.220)
Inner Rotor-To-Body Clearance	.0012-.0028 (.030-.070)
Inner Rotor-To-Brazed Portion Of Housing Clearance	.0014-.0028 (.035-.070)
Outer Rotor-To-Body Clearance	.0024-.0043 (.060-.110)
Regulator Valve-To-Pump Body Clearance	.0016-.0039 (.040-.100)

OIL PUMP SPECIFICATIONS

TORQUE SPECIFICATIONS

Application		Ft. Lbs. (N.m)
Auxiliary Drive Belt Auto Tensioner Bolt		15-18 (20-25)
Balancer Unit Mounting Bolt (1) (2)
Step 1		33-38 (45-51)
Step 2		Tighten Additional 90-95 Degrees
Step 3		Fully Loosen Bolts
Step 4		33-38 (45-51)
Step 5		Tighten Additional 90-95 Degrees
Camshaft Sprocket Bolt		94-115 (128-156)
Connecting Rod Bolt (3)
Step 1		14-15 (19-20)
Step 2		Tighten Additional 85-95 Degrees
Coolant Temperature Sensor		15-21 (20-29)
Crankshaft Pulley Bolt
Step 1		27-35 (37-47)
Step 2		Tighten Additional 60-66 Degrees
Cylinder Block Coolant Drain Plug		25-32 (34-44)
Cylinder Head Bolt (4) (5)
Step 1		72 (98)
Step 2		Fully loosen Bolts
Step 3		25-32 (34-44)
Step 4		Tighten Additional 75-80 Degrees
	Step 5	Tighten Additional 75-80 Degrees Again
Drive Plate/Flywheel Bolt		76-83 (103-113)
Engine Coolant Inlet & Outlet Bolt		16-21 (22-28)
Engine Mounting
Center Member Bolt		57-72 (77-98)
Front Engine Mount-To-Center Member		44-52 (60-70)
Front Engine Mount Bracket-To-Engine Bolt		37-44 (50-60)
Front Engine Mount Through Bolt		46-58 (62-78)
Left Engine Mount Bolt		32-41 (43-55)
Left Engine Mount Through Bolt		47-55 (64-74)
Rear Engine Mount-To-Center Member Bolt		57-72 (77-98)
Rear Engine Mount Bracket-To-Engine Bolt		57-63 (77-85)
Rear Engine Mount Through Bolt		57-72 (77-98)
Right Engine Mount-To-Right Engine Mount Bracket		44-52 (60-70)
Right Engine Mount Bracket-To-Engine Bolt		32-41 (43-55)
Engine Slinger Bolt
Front		38-48 (51-65)
Rear		18-23 (25-31)
Exhaust Manifold Nut (6)		29-32 (39-44)
Generator Bolt
Adjustment Bolt		18-23 (25-31)
Lower Mounting Bolt		33-38 (45-52)
Heater Pipe-To-Cylinder Block Bolt		16-21 (22-28)
Intake Manifold-To-Cylinder Head Bolts/Nuts (7)		13-16 (18-22)
Intake Manifold Collector-To-Intake Manifold Bolt (8)		13-16 (18-22)
Intake Manifold Support Bolt		13-16 (18-22)
Knock Sensor Bolt		12-20 (16-27)
Lower Cylinder Block Bolt (9) (10)
Step 1 - Bolts 1-10		27-31 (36-42)
Step 2 - Bolts 1-10		Tighten Additional 60-65 Degrees
Step 3 - Bolts 11-22		15-18 (20-25)
Oil Dipstick Tube Bolt		15-18 (20-25)
Oil Drain Plug		22-29 (30-39)
Oil Pan-To-Transaxle Bolt		30-34 (40-46)
Oil Pressure Regulator Plug		29-50 (39-68)
Oil Strainer Bolts		15-18 (20-25)
Oxygen Sensor		30-37 (40-50)
Spark Plug		15-21 (20-29)
Starter Bolt		72-94 (98-127)
Timing Chain Slack Guide Bolt		12-13 (16-17)
Transaxle-To-Engine Bolt
Automatic (11)
Bolts 2, 3, 4, 5 & 6		52-58 (70-79)
Bolts 1, 7, 8, 9, 10 & 11		23-30 (31-40)
Manual (12)
Bolts 2, 3, 4 & 5		52-58 (70-79)
Bolts 1, 6, 7, 8, 9 & 10		23-30 (31-40)
Upper Oil Pan-To-Cylinder Block Bolt (13)
6 mm Bolts		71-89 INCH Lbs. (8-10)
8 mm Bolts		15-18 (20-25)
Water Pipe-To-Water Pump Housing Bolts		16-21 (22-28)
Water Pump Bolts		16-21 (22-28)
Water Pump Housing Bolt		16-21 (22-28)
INCH Lbs. (N.m)
Air Cleaner Assembly Bolt		35-44 (4-5)
Balancer Unit Timing Chain Tensioner Bolt		53-71 (6-8)
Camshaft Bracket Bolt (14)
Step 1 - Bolts 9-11		18 (2)
Step 2 - Bolts 1-8		18 (2)
Step 3 - All Bolts		53 (6)
Step 4 - All Bolts		80-106 (9-12)
Camshaft Position Sensor Bolt		44-62 (5-7)
Crankshaft Position Sensor Bolt		44-62 (5-7)
Crankshaft Signal Plate Bolt		106-124 (12-14)
Electric Throttle Control Actuator Bolts		62-89 (7-10)
EVAP Canister Purge Volume Control Solenoid Bolt		44-53 (5-6)
Exhaust Manifold Heat Shield Bolt		44-62 (5-7)
Front Cover Bolt (15)		106-115 (12-13)
Ignition Coil Bolt		44-62 (5-7)
Intake Valve Timing Control Cover Bolts (16)		106-115 (12-13)
Intake Valve Timing Control Solenoid Valve Bolt		62-89 (7-10)
Lower Oil Pan-To-Upper Oil Pan Bolts (17)		53-71 (6-8)
Oil Pressure Switch		106-150 (12-17)
Oil Pump Mounting Bolt		53-71 (6-8)
Oil Strainer Bracket Bolt		71-89 (8-10)
Radiator Drain Plug		80-106 (9-12)
Rocker Cover Bolt (18)
Step 1		9-27 (1-3)
Step 2		62-80 (7-9)
Timing Chain Tensioner Bolt		80-97 (9-11)
Vacuum Reservoir Tank Bolt		62-89 (7-10)
(1) Measure diameter of balancer unit mounting bolt 10 mm and 70 mm from first thread of bolt. If the difference between bolt diameter measurement is more than 0.15 mm, replace bolt. (2) Tighten balancer unit bolts in sequence. see scheme 253 (3) Measure diameter of connecting rod bolt 19 mm from tip of bolt. If diameter of bolt is less than 7.75 mm, replace bolt. (4) Measure diameter of cylinder head bolt 12 mm and 55 mm from tip of bolt. If the difference between bolt diameter measurements is less than 0.23 mm, replace bolt. (5) Tighten cylinder head bolts in sequence. see scheme 254 (6) Tighten exhaust manifold nuts in sequence. see scheme 255 (7) Tighten intake manifold bolts/nuts in sequence. see scheme 256 (8) Tighten intake manifold collector bolts/nuts in sequence. see scheme 257 (9) Measure diameter of lower cylinder block bolt 10 mm and 50 mm from tip of bolt. If the difference between bolt diameter measurements is more than 0.13 mm, replace bolt. (10) Tighten lower cylinder block bolts in sequence. see scheme 258 (11) Tighten automatic transaxle-to-engine bolts in sequence. see scheme 259 (12) Tighten manual transaxle-to-engine bolts in sequence. see scheme 260 (13) Tighten upper oil pan bolts in sequence. see scheme 261 (14) Tighten camshaft bracket bolts in sequence. see scheme 262 (15) Tighten front cover bolts in sequence. see scheme 263 (16) Tighten intake valve timing control cover bolts in sequence. see scheme 264 (17) Tighten lower oil pan bolts in sequence. see scheme 265 (18) Tighten rocker cover bolts in sequence. see scheme 266

(1)	Measure diameter of balancer unit mounting bolt 10 mm and 70 mm from first thread of bolt. If the difference between bolt diameter measurement is more than 0.15 mm, replace bolt.

(2)	Tighten balancer unit bolts in sequence. see scheme 253

(3)	Measure diameter of connecting rod bolt 19 mm from tip of bolt. If diameter of bolt is less than 7.75 mm, replace bolt.

(4)	Measure diameter of cylinder head bolt 12 mm and 55 mm from tip of bolt. If the difference between bolt diameter measurements is less than 0.23 mm, replace bolt.

(5)	Tighten cylinder head bolts in sequence. see scheme 254

(6)	Tighten exhaust manifold nuts in sequence. see scheme 255

(7)	Tighten intake manifold bolts/nuts in sequence. see scheme 256

(8)	Tighten intake manifold collector bolts/nuts in sequence. see scheme 257

(9)	Measure diameter of lower cylinder block bolt 10 mm and 50 mm from tip of bolt. If the difference between bolt diameter measurements is more than 0.13 mm, replace bolt.