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Table of Contents
Troubleshooting
Related Manuals for Isuzu NKR 4J Series
Summarization of Contents
SECTION 6 ENGINE 4J SERIES
WORKSHOP MANUAL
General title of the document.
NHR • NKR • NPR
Identifies applicable Isuzu vehicle models.
SECTION 6
Indicates the main section covering engine systems.
THIS MANUAL INCLUDES THE FOLLOWING SECTIONS
SECTION NO. CONTENTS
Table header for section numbers and their corresponding content titles.
SECTION 00 SERVICE INFORMATION
CONTENTS
Table header for contents within Section 00.
Troubleshooting
Identifies common engine issues, possible causes, and corrective actions.
Main Data and Specifications
Provides essential technical data and specifications for engine components.
Service Standard
Outlines acceptable service standards for engine parts and assemblies.
Servicing
Covers general maintenance procedures performed by qualified personnel.
Fixing Torque
Lists critical torque specifications for component assembly and fastening.
Special Tools
Lists specialized tools required for specific service operations.
SECTION 00 SERVICE INFORMATION
TROUBLESHOOTING
Identifies common engine issues, possible causes, and corrective actions.
SECTION 6A GENERAL ENGINE MECHANICAL
CONTENTS
Table header for contents within Section 6A.
General Description
Provides a general overview of the engine mechanical systems.
Engine Mount (RH)
Details the removal and installation of the right-hand engine mount.
Engine Mount (LH)
Details the removal and installation of the left-hand engine mount.
Inlet Manifold
Covers the removal and installation of the inlet manifold.
Exhaust Manifold
Details the removal and installation of the exhaust manifold.
Oil Cooler
Explains the inspection and installation of the oil cooler.
Oil Filter Cartridge
Covers the removal and installation of the oil filter cartridge.
Cylinder Head Cover
Details the removal and installation of the cylinder head cover.
Rocker Arm Shaft Assembly
Explains the rocker arm shaft assembly removal and installation.
Valvestem Oil Controller and Valve Spring
Covers valvestem oil controller and valve spring procedures.
Timing Gear
Details the timing gear components and procedures.
Timing Belt
Explains the removal and installation of the timing belt.
Cylinder Head Assembly and Gasket
Covers the cylinder head assembly and gasket procedures.
Oil Pan
Details the removal and installation of the oil pan.
Oil Pump Assembly
Explains the oil pump assembly removal and installation.
Piston, Piston Ring and Connecting Rod
Covers piston, ring, and connecting rod assembly procedures.
Camshaft and Tappet
Details camshaft and tappet removal and installation.
Crankshaft Front Oil Seal (Gear Drive Type)
Covers the removal and installation of the front oil seal (gear drive).
Crankshaft Front Oil Seal (Belt Drive Type)
Details the removal and installation of the front oil seal (belt drive).
Crankshaft Rear Oil Seal (Gear & Belt Drive Type)
Covers the removal and installation of the rear oil seal.
Flywheel and Pilot Bearing
Details flywheel and pilot bearing procedures.
Crankshaft and Main Bearings
Explains crankshaft and main bearing installation.
Engine Assembly
Covers the engine assembly removal and installation.
SECTION 6A1 4JB1/4JB1T/4JB1TC/4JG2-ENGINE
CONTENTS
Table header for contents within Section 6A1.
General Description
Provides an overview of the engine models.
Engine Mount (RH)
Details the removal and installation of the right-hand engine mount.
Engine Mount (LH)
Details the removal and installation of the left-hand engine mount.
Inlet Manifold
Covers the removal and installation of the inlet manifold.
Exhaust Manifold
Details the removal and installation of the exhaust manifold.
Oil Cooler
Explains the inspection and installation of the oil cooler.
Oil Filter Cartridge
Covers the removal and installation of the oil filter cartridge.
Cylinder Head Cover
Details the removal and installation of the cylinder head cover.
Rocker Arm Shaft Assembly
Explains the rocker arm shaft assembly removal and installation.
Valvestem Oil Controller and Valve Spring
Covers valvestem oil controller and valve spring procedures.
Timing Gear
Details the timing gear components and procedures.
Timing Belt
Explains the removal and installation of the timing belt.
Cylinder Head Assembly and Gasket
Covers the cylinder head assembly and gasket procedures.
Oil Pan
Details the removal and installation of the oil pan.
Oil Pump Assembly
Explains the oil pump assembly removal and installation.
Piston, Piston Ring and Connecting Rod
Covers piston, ring, and connecting rod assembly procedures.
Camshaft and Tappet
Details camshaft and tappet removal and installation.
Crankshaft Front Oil Seal (Gear Drive Type)
Covers the removal and installation of the front oil seal (gear drive).
Crankshaft Front Oil Seal (Belt Drive Type)
Details the removal and installation of the front oil seal (belt drive).
Crankshaft Rear Oil Seal (Gear & Belt Drive Type)
Covers the removal and installation of the rear oil seal.
Flywheel and Pilot Bearing
Details flywheel and pilot bearing procedures.
Crankshaft and Main Bearings
Explains crankshaft and main bearing installation.
Engine Assembly
Covers the engine assembly removal and installation.
SECTION 6B ENGINE COOLING
CONTENTS
Table header for contents within Section 6B.
General Description
Provides a general overview of the engine cooling system.
On-Vehicle Service
Details service procedures for the cooling system on the vehicle.
Water Pump
Covers the removal and installation of the water pump.
Thermostat
Explains thermostat inspection and installation.
Radiator
Details radiator removal, inspection, and installation.
Drive Belt Adjustment
Covers the adjustment procedure for drive belts.
SECTION 6C ENGINE FUEL
CONTENTS
Table header for contents within Section 6C.
General Description
Provides general information about the engine fuel system.
On-Vehicle Service
Details service procedures for the fuel system on the vehicle.
Fuel Filter Assembly
Covers the removal and installation of the fuel filter assembly.
Fuel Filter Cartridge
Explains the fuel filter cartridge removal, installation, and bleeding.
Injection nozzle
Details the injection nozzle removal, inspection, and disassembly.
Injection Pump Assembly (Gear Drive Type)
Covers the removal and installation of the injection pump (gear drive).
Injection Pump Assembly (Belt Drive Type)
Details the removal and installation of the injection pump (belt drive).
Injection Timing Adjustment
Explains the procedure for adjusting injection timing.
Adjustment of Idling Speed
Covers the adjustment of engine idling speed.
Injection Pump Data
Provides data and specifications for injection pumps.
Injection Volume and Governor Performance Diagram
Illustrates injection volume and governor performance curves.
Fuel Tank
Details the removal and installation of the fuel tank.
Fuel Gauge Unit
Covers the removal and installation of the fuel gauge unit.
Accelerator Control
Explains accelerator control cable removal and installation.
Accelerator Control Cable
Details the accelerator control cable procedures.
Accelerator Pedal
Covers accelerator pedal removal and installation.
Idling Control Cable
Details the idling control cable procedures.
Air Cleaner Element
Covers air cleaner element removal, cleaning, and inspection.
SECTION 6D ENGINE ELECTRICAL
Battery
Covers battery general description, diagnosis, and service.
Starting System
Details the starting system circuit and components.
Charging System
Explains the charging system circuit and components.
QOS-II Preheating System
Covers the QOS II preheating system operation and troubleshooting.
QOS-III Preheating System
Details the QOS III preheating system operation and troubleshooting.
SECTION 6D1 BATTERY
CONTENTS
Table header for contents within Section 6D1.
General Description
Provides a general description of the battery.
Diagnosis
Outlines battery diagnosis procedures including visual inspection and voltage checks.
On-Vehicle Service
Covers battery charging and jump starting procedures.
Battery Charging
Details safety precautions and procedures for charging the battery.
Jump Starting
Explains the procedure for jump starting a vehicle with an auxiliary battery.
Removal and Installation of Battery
Covers the steps for removing and installing the vehicle battery.
Main Data and Specifications
Provides key data and specifications for different battery models.
SECTION 6D2 STARTING SYSTEM
CONTENTS
Table header for contents within Section 6D2.
General Description
Provides a general overview of the starting circuit and starter.
On-Vehicle Service
Details the removal and installation of the starter assembly.
Unit Repair
Covers the disassembly and inspection of starter components.
SECTION 6D3 CHARGING SYSTEM
CONTENTS
Table header for contents within Section 6D3.
General Description
Provides an overview of the charging system components.
Diagnosis
Outlines on-vehicle inspection and diagnosis of the charging system.
On-Vehicle Service
Covers the removal and installation of the generator assembly.
Unit Repair
Details the disassembly and inspection of generator components.
SECTION 6D6 QOSII PREHEATING SYSTEM
CONTENTS
Table header for contents within Section 6D6.
General Description
Provides an overview of the QOS II preheating system.
System Diagram
Illustrates the system diagram for the QOS II preheating system.
Inspection on QOS II system Operation
Details inspection procedures for the QOS II system operation.
QOSII System Troubleshooting
Provides troubleshooting steps for common QOS II system issues.
SECTION 6D7 QOSIII PREHEATING SYSTEM
CONTENTS
Table header for contents within Section 6D7.
General Description
Provides an overview of the QOS III preheating system.
System Diagram
Illustrates the system diagram for the QOS III preheating system.
Inspection on QOS III system Operation
Details inspection procedures for the QOS III system operation.
SECTION 6E EXHAUST GAS RECIRCULATION (EGR) SYSTEM
CONTENTS
Table header for contents within Section 6E.
General Description
Provides a general description of the EGR system.
EGR System Wiring Diagram
Illustrates the wiring diagram for the EGR system.
EGR System Operation
Explains how the EGR system operates under different conditions.
EGR System Check
Details the steps for checking the EGR system's functionality.
Inspection
Covers the inspection of EGR system components like VSV and EGR valve.
SECTION 6F ENGINE EXHAUST
CONTENTS
Table header for contents within Section 6F.
General Description
Provides a general overview of the exhaust system.
Three Way Catalytic Converter
Explains the function and types of the catalytic converter.
On-Vehicle Service
Details on-vehicle service checks for the exhaust system.
Front Exhaust Pipe
Covers the removal and installation of the front exhaust pipe.
Exhaust Brake Unit
Details the inspection of the exhaust brake unit.
Inspection
Covers inspection of exhaust system components for damage.
SECTION 6G TURBOCHARGER
CONTENTS
Table header for contents within Section 6G.
Turbocharger
Provides main data and specifications for the turbocharger.
Main Data and Specifications
Lists key specifications for different turbocharger models.
General Description
Provides a general description of the turbocharger's function.
Identification of Unit
Explains how to identify the turbocharger unit via its nameplate.
Turbocharger Servicing
Outlines general servicing procedures and precautions for turbochargers.
Precautions
Lists important precautions for turbocharger servicing.
Disassembly
Details the steps for disassembling the turbocharger.
Inspection and Repair
Covers inspection and repair procedures for turbocharger components.
Reassembly
Provides steps for reassembling the turbocharger.
IHI Service Network
Lists contact information for IHI service facilities.
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