Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1997.1999-2001 Approved 2000 XJ Jeep Cherokee exj_9
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XJ ENGINE 9-1
ENGINE
TABLE OF CONTENTS
page page
2.5L ENGINE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4.0L ENGINE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
2.5L ENGINE
TABLE OF CONTENTS
page page
DESCRIPTION AND OPERATION REPAIR DAMAGED OR WORN THREADS . . . . . . 27
ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 SERVICE ENGINE ASSEMBLY (SHORT BLOCK). . . . 27
LUBRICATION SYSTEM. . . . . . . . . . . . . . . . . . . . . 2 HYDROSTATIC LOCK . . . . . . . . . . . . . . . . . . . . . 27
CYLINDER BLOCK. . . . . . . . . . . . . . . . . . . . . . . . . 5 ENGINE OIL SERVICE . . . . . . . . . . . . . . . . . . . . . 27
CYLINDER HEAD. . . . . . . . . . . . . . . . . . . . . . . . . . 5 REMOVAL AND INSTALLATION
CRANKSHAFT . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 ENGINE MOUNTS--FRONT. . . . . . . . . . . . . . . . . 29
PISTON AND CONNECTING ROD . . . . . . . . . . . . . 6 ENGINE MOUNT--REAR . . . . . . . . . . . . . . . . . . . 30
CAMSHAFT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
ROCKER ARM . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 INTAKE MANIFOLD . . . . . . . . . . . . . . . . . . . . . . . 33
VALVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 EXHAUST MANIFOLD . . . . . . . . . . . . . . . . . . . . . 35
VALVE SPRING . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 CYLINDER HEAD COVER . . . . . . . . . . . . . . . . . . 35
CYLINDER HEAD COVER . . . . . . . . . . . . . . . . . . . 7 ROCKER ARMS AND PUSH RODS . . . . . . . . . . . 36
HYDRAULIC TAPPET. . . . . . . . . . . . . . . . . . . . . . . 7 VALVE SPRING AND SEAL . . . . . . . . . . . . . . . . . 37
VALVE GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 CYLINDER HEAD. . . . . . . . . . . . . . . . . . . . . . . . . 38
OIL PAN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 CYLINDER HEAD. . . . . . . . . . . . . . . . . . . . . . . . . 40
VALVE STEM SEAL . . . . . . . . . . . . . . . . . . . . . . . . 8 HYDRAULIC TAPPETS. . . . . . . . . . . . . . . . . . . . . 40
INTAKE MANIFOLD . . . . . . . . . . . . . . . . . . . . . . . . 8 VIBRATION DAMPER . . . . . . . . . . . . . . . . . . . . . . 41
EXHAUST MANIFOLD . . . . . . . . . . . . . . . . . . . . . . 8 TIMING CASE COVER OIL SEAL . . . . . . . . . . . . . 41
DIAGNOSIS AND TESTING TIMING CASE COVER . . . . . . . . . . . . . . . . . . . . . 42
ENGINE DIAGNOSIS--INTRODUCTION. . . . . . . . . 8 TIMING CHAIN AND SPROCKETS . . . . . . . . . . . . 43
SERVICE DIAGNOSIS--PERFORMANCE . . . . . . . 9 CAMSHAFT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
SERVICE DIAGNOSIS--MECHANICAL. . . . . . . . . 10 CAMSHAFT PIN REPLACEMENT . . . . . . . . . . . . . 45
INTAKE MANIFOLD LEAKAGE DIAGNOSIS . . . . . 13 CAMSHAFT BEARINGS . . . . . . . . . . . . . . . . . . . . 47
CYLINDER COMPRESSION PRESSURE TEST . . 13 CRANKSHAFT MAIN BEARINGS . . . . . . . . . . . . . 47
ENGINE CYLINDER HEAD GASKET FAILURE OIL PAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 OIL PUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
CYLINDER COMBUSTION PRESSURE PISTON AND CONNECTING ROD . . . . . . . . . . . . 51
LEAKAGE TEST . . . . . . . . . . . . . . . . . . . . . . . . 13 REAR MAIN OIL SEAL . . . . . . . . . . . . . . . . . . . . . 52
ENGINE OIL LEAK INSPECTION . . . . . . . . . . . . . 14 DISASSEMBLY AND ASSEMBLY
ENGINE OIL PRESSURE . . . . . . . . . . . . . . . . . . . 15 CYLINDER BLOCK. . . . . . . . . . . . . . . . . . . . . . . . 53
SERVICE PROCEDURES CLEANING AND INSPECTION
VALVE TIMING . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 ROCKER ARMS AND PUSH RODS . . . . . . . . . . . 53
VALVE, GUIDE AND SEAL . . . . . . . . . . . . . . . . . . 15 ENGINE CYLINDER HEAD. . . . . . . . . . . . . . . . . . 54
PISTON--FITTING . . . . . . . . . . . . . . . . . . . . . . . . 17 CYLINDER BLOCK. . . . . . . . . . . . . . . . . . . . . . . . 54
PISTON RING--FITTING . . . . . . . . . . . . . . . . . . . 18 SPECIFICATIONS
CONNECTING ROD BEARINGS--FITTING . . . . . 21 ENGINE SPECIFICATIONS. . . . . . . . . . . . . . . . . . 55
FITTING CRANKSHAFT MAIN BEARINGS . . . . . . 23 SPECIFICATIONS--TORQUE . . . . . . . . . . . . . . . . 59
FORM-IN-PLACE GASKETS. . . . . . . . . . . . . . . . . 25 SPECIAL TOOLS
ENGINE PERFORMANCE . . . . . . . . . . . . . . . . . . 26 2.5L ENGINE SPECIAL TOOLS . . . . . . . . . . . . . . 60
HONING CYLINDER BORES . . . . . . . . . . . . . . . . 26
9-2 2.5L ENGINE XJ
DESCRIPTION AND OPERATION
ENGINE
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 combustion cham-
bers that create turbulence and fast burning 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
Fig. 2 Build Date Code Location
within four bearings.
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