Dodge Dakota (R1). Manual — part 453
Fig.
1
1
CHASSIS
SPLICES
8Wa - 95 - 8
8W-95 SPLICE LOCATIONS
R1
SPLICE LOCATIONS (Continued)
ENGINE
TABLE OF CONTENTS
page
page
ENGINE 2.5L
TABLE OF CONTENTS
page
page
ENGINE 2.5L
STANDARD PROCEDURE . . . . . . . . . . . . . . . . . . . 9
AIR CLEANER ELEMENT
CYLINDER HEAD
CYLINDER HEAD GASKET . . . . . . . . . . . . . . . 20
STANDARD PROCEDURE . . . . . . . . . . . . . . . . . . 21
CYLINDER HEAD COVER(S)
ROCKER ARMS
INTAKE/EXHAUST VALVES & SEATS
VALVE SPRINGS
STANDARD PROCEDURE . . . . . . . . . . . . . . . . . . 28
VALVE SPRING - TESTING . . . . . . . . . . . . . . . 28
ENGINE BLOCK
CAMSHAFT & BEARINGS (IN BLOCK)
CONNECTING ROD BEARINGS
STANDARD PROCEDURE . . . . . . . . . . . . . . . . . . 32
CONNECTING ROD BEARING - FITTING . . . . . 32
CRANKSHAFT
AN
ENGINE
9 - 1
INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . 34
CRANKSHAFT MAIN BEARINGS
CRANKSHAFT MAIN BEARINGS - FITTING . . . 36
CRANKSHAFT OIL SEAL - FRONT
CRANKSHAFT OIL SEAL - REAR
HYDRAULIC LIFTERS (CAM IN BLOCK)
DIAGNOSIS AND TESTING . . . . . . . . . . . . . . . . . 42
HYDRAULIC TAPPETS . . . . . . . . . . . . . . . . . . . 42
PISTON & CONNECTING ROD
PISTON FITTING . . . . . . . . . . . . . . . . . . . . . . . 44
PISTON RINGS
STANDARD PROCEDURE . . . . . . . . . . . . . . . . . . 46
PISTON RING FITTING . . . . . . . . . . . . . . . . . . 46
VIBRATION DAMPER
FRONT MOUNT
REAR MOUNT
LUBRICATION
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
OIL
STANDARD PROCEDURE . . . . . . . . . . . . . . . . . . 53
ENGINE OIL . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
OIL FILTER
OIL PAN
OIL PRESSURE SENSOR/SWITCH
OIL PUMP
INTAKE MANIFOLD
INTAKE MANIFOLD . . . . . . . . . . . . . . . . . . . . . 57
EXHAUST MANIFOLD
VALVE TIMING
STANDARD PROCEDURE . . . . . . . . . . . . . . . . . . 60
CHECKING TIMING CHAIN WEAR . . . . . . . . . . 60
TIMING BELT / CHAIN COVER(S)
TIMING BELT/CHAIN AND SPROCKETS
9 - 2
ENGINE 2.5L
AN
ENGINE 2.5L
DESCRIPTION
The 2.5 liter (150 CID) four-cylinder engine is an
In-line, lightweight, overhead valve engine.
This engine is designed for unleaded fuel. The
engine cylinder head has dual quench-type combus-
tion chambers that create turbulence and fast burn-
ing of the air/fuel mixture. This results in good fuel
economy.
The cylinders are numbered 1 through 4 from front
to rear. The firing order is 1-3-4-2 (Fig. 1).
The crankshaft rotation is clockwise, when viewed
from the front of the engine. The crankshaft rotates
within five main bearings and the camshaft rotates
within four bearings.
The engine Build Date Code is located on a
machined surface on the right side of the cylinder
block between the No.3 and No.4 cylinders (Fig. 2).
The digits of the code identify:
• 1st Digit—The year (8 = 1998).
• 2nd & 3rd Digits—The month (01 - 12).
• 4th & 5th Digits—The engine type/fuel system/
compression ratio (HX = A 2.5 liter (150 CID) 9.1:1
compression ratio engine with a multi-point fuel
injection system).
• 6th & 7th Digits—The day of engine build (01 -
31).
FOR EXAMPLE: Code * 801HX23 * identifies a
2.5 liter (150 CID) engine with a multi-point fuel
injection system, 9.1:1 compression ratio and built on
January 23, 1998.
DIAGNOSIS AND TESTING—ENGINE
DIAGNOSIS - INTRODUCTION
Engine diagnosis is helpful in determining the
causes of malfunctions not detected and remedied by
routine maintenance.
These malfunctions may be classified as either
mechanical (e.g., a strange noise), or performance
(e.g., engine idles rough and stalls).
(Refer to 9 - ENGINE - DIAGNOSIS AND TEST-
ING - Preformance) or (Refer to 9 - ENGINE - DIAG-
NOSIS AND TESTING - Mechanical). Refer to 14 -
FUEL SYSTEM for fuel system diagnosis.
Additional tests and diagnostic procedures may be
necessary for specific engine malfunctions that can-
not be isolated with the Service Diagnosis charts.
Information concerning additional tests and diagno-
sis is provided within the following:
• Cylinder Compression Pressure Test (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
• Cylinder Combustion Pressure Leakage Test
(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
• Cylinder Head Gasket Failure Diagnosis (Refer
to 9 - ENGINE/CYLINDER HEAD - DIAGNOSIS
AND TESTING)
• Intake Manifold Leakage Diagnosis (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE
MANIFOLD
-
DIAGNOSIS AND TESTING)
• Lash Adjuster (Tappet) Noise Diagnosis (Refer to
9 - ENGINE/ENGINE BLOCK/HYDRAULIC LIFT-
ERS (CAM IN BLOCK) - DIAGNOSIS AND TEST-
ING)
• Engine Oil Leak Inspection (Refer to 9 - ENGINE/
LUBRICATION - DIAGNOSIS AND TESTING)
Fig. 1 Engine Firing Order
Fig. 2 Build Date Code Location
1 - NO. 4 CYLINDER
2 - NO. 3 CYLINDER
3 - DAY
4 - MONTH
5 - YEAR
6 - MACHINED SURFACE
AN
ENGINE 2.5L
9 - 3
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