Table of Contents
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Revised (10-12)
Doosan purchased Bobcat Company from Ingersoll-Rand Company in
2007. Any reference to Ingersoll-Rand Company or use of trademarks,
service marks, logos, or other proprietary identifying marks belonging
to Ingersoll-Rand Company in this manual is historical or nominative
in nature, and is not meant to suggest a current affiliation between
Ingersoll-Rand Company and Doosan Company or the products of
either.
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Chapters
Table of Contents
Related Manuals for Isuzu A-6BG1T
Summarization of Contents
General Information
General Repair Instructions
Step-by-step guide for safe and effective engine service operations.
Main Data and Specifications
Key specifications and data for 4BG1, 4BG1T, 6BG1, 6BG1T engines.
Tightening Torque Specifications
Torque values for various bolt sizes and types for engine assembly.
Angular Nut and Bolt Tightening Method
Detailed method for tightening nuts and bolts using angular rotation.
Identifications
Information on identifying engine and injection pump models and serial numbers.
Maintenance
Lubricating System
Procedures for replacing the main oil filter for different types.
Fuel System
Procedures for fuel filter replacement and overflow valve check.
Cooling System
Adjustment of cooling fan drive belt tension and thermostat inspection.
Valve Clearance and Adjustment
Procedure for adjusting valve clearances on engine cylinders.
Injection Timing
Procedures for checking and adjusting engine injection timing.
Compression Pressure Measurement
Steps to measure engine cylinder compression pressure using a gauge.
Recommended Lubricants
Recommended lubricants and engine oil viscosity chart based on ambient temperature.
Engine Assembly I (Disassembly)
External Parts Disassembly Steps
Step-by-step guide for disassembling external engine parts.
Major Components - I
Exploded view and disassembly steps for major engine components.
Cylinder Head Disassembly Steps
Disassembly steps for cylinder head and its related parts.
Piston and Connecting Rod Disassembly Steps
Disassembly steps for piston, connecting rod, and bearings.
Engine Assembly II (Inspection & Repair)
Cylinder Head Inspection
Inspecting cylinder head lower face warpage and height.
Valve Guide Clearance
Measuring valve stem and valve guide clearance using dial indicators.
Valve Depression
Measuring valve depression from the cylinder head lower surface.
Crankshaft and Bearing Inspection
Inspecting crankshaft journal and pin surfaces for wear and damage.
Crankshaft Run-Out
Measuring crankshaft run-out using a dial indicator on V-blocks.
Piston Ring Gap
Measuring piston ring gaps using a feeler gauge.
Engine Assembly III (Reassembly)
Piston and Connecting Rod Reassembly Steps
Reassembly steps for piston, connecting rod, rings, and bearings.
Cylinder Head Reassembly Steps
Reassembly steps for cylinder head components like valves and springs.
Major Component Reassembly Steps I
Reassembly steps for major engine components like crankshaft and camshaft.
Major Component Reassembly Steps II
Reassembly steps for engine block major components like flywheel and cylinder head.
Cylinder Head Bolts
Tightening cylinder head bolts using an angular method.
Injection Timing Adjustment
Checking and adjusting fuel injection timing after assembly.
Engine Tuning Operation
Mounting and Connecting
Mounting engine, filling oil, and connecting pipes before tuning.
Bleeding Fuel Lines
Procedure for bleeding air from fuel lines after assembly.
Engine Operation Checks
Checking oil circulation, leaks, noise, and charging system.
Engine Run-In Operation
Running engine at specified speeds for warming up and run-in.
Lubricating System
General Description
Overview of the engine's normal forced circulation lubricating system.
Oil Pump
Disassembly steps for the engine's oil pump.
Main Oil Filter
Disassembly and inspection steps for the main oil filter.
Oil Cooler
Disassembly and inspection steps for the oil cooler assembly.
Cooling System
General Description
Overview of the pressurized, forced circulation cooling system.
Water Pump
Disassembly steps for the water pump assembly.
Thermostat
Inspection of the thermostat function.
Fuel System
General Description
Overview of the fuel system components and operation.
Fuel Filter
Disassembly, inspection, and reassembly steps for the fuel filter.
Injection Nozzle
Disassembly, inspection, and reassembly steps for the injection nozzle.
Injection Starting Pressure Adjustment
Procedure for adjusting the injection nozzle starting pressure.
Injection Pump Calibration Data
Test conditions and calibration data required for fuel injection amount adjustment.
Turbocharger
General Description
Sectional views of TD04H and RHE6 turbocharger models.
Turbocharger Identification
Information on identifying IHI and Mitsubishi turbocharger models.
Inspection and Repair
Procedures for checking rotor shaft axial and radial play.
Air Compressor
General Description
Sectional view and main data for the air compressor.
Disassembly Steps
Disassembly steps for air compressor components.
Inspection and Repair
Measuring cylinder bore wear, piston/bore clearance, and ring clearances.
Engine Electricals
Starter Identification
Information on identifying starter motor models and plates.
Starter Main Data and Specifications
Technical data and specifications for starter motors.
Alternator Identification
Information on identifying alternator models and plates.
Alternator Main Data and Specifications
Technical data and specifications for alternators.
Troubleshooting
Hard Starting Issues
Diagnosing and resolving common hard starting problems.
Unstable Low Idling
Identifying and resolving causes of unstable low idling engine speed.
Insufficient Power
Troubleshooting steps for diagnosing and resolving insufficient engine power.
Excessive Fuel Consumption
Identifying causes and remedies for excessive fuel consumption.
Excessive Oil Consumption
Troubleshooting causes of excessive engine oil consumption.
Overheating
Diagnosing and resolving engine overheating problems.
White Exhaust Smoke
Troubleshooting causes of white exhaust smoke from the engine.
Oil Pressure Does Not Rise
Diagnosing and resolving low engine oil pressure issues.
Abnormal Engine Noise
Troubleshooting various engine noises like knocking and slapping.
Special Tool List
Special Tool List Details
List of special tools with part numbers and corresponding page references.
Conversion Table
Length Conversion
Conversion factors for length measurements between millimeters and inches.
Area Conversion
Conversion factors for area measurements between square inches and square centimeters.
Volume Conversion
Conversion factors for volume measurements between U.S. gallons/liters and Imperial gallons/liters.
Mass Conversion
Conversion factors for mass between pounds and kilograms.
Pressure Conversion
Conversion factors for pressure between psi, kg/cm², and kPa.
Torque Conversion
Conversion factors for torque between ft.lbs, kg-m, and N-m.
Temperature Conversion
Conversion factors for temperature between Fahrenheit and Centigrade.
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