Description
Komatsu 3D68E-3 Workshop Manual covering the Komatsu 3D68E-3 to 3D88E-3 diesel engine series. This detailed 203-page workshop publication provides technical information for servicing, maintaining, inspecting, diagnosing and repairing the covered Komatsu engines.
Designed for professional technicians, diesel-engine specialists, machinery owners and experienced mechanics, the manual provides the workshop information required to understand the engine’s construction and complete repairs correctly. It is suitable for engines installed in construction machinery, agricultural equipment, industrial machines and other Komatsu-powered applications.
Engine Series Covered
• Komatsu 3D68E-3 engine series
• Komatsu engines through to the 3D88E-3 series
Engine specifications and components can vary between individual models. Always compare the engine identification and model information on your equipment with the details shown in the manual before beginning work.
Engine Construction and Operation
The Komatsu 3D68E-3 Workshop Manual explains the construction, arrangement and operation of the principal engine systems. This technical information helps users understand how individual components work together and provides a reliable foundation for servicing and fault diagnosis.
Coverage relates to the main engine assembly, cylinder block, cylinder head, pistons, piston rings, connecting rods, crankshaft, bearings, valve mechanism and associated internal components. Diagrams and workshop instructions help identify parts and establish their correct position within the engine.
Routine Servicing and Maintenance
Regular maintenance is essential for reliable starting, efficient operation and a long engine service life. This manual contains information useful for completing routine inspections and workshop servicing across the covered Komatsu engine series.
Maintenance guidance may include lubrication-system checks, cooling-system inspection, fuel-system servicing, filter replacement, engine adjustments and general condition checks. Correct servicing can help identify worn components, leaks and incorrect adjustments before they develop into expensive engine failures.
Fuel and Injection System
The diesel fuel system must deliver the correct amount of clean fuel at the proper time. The workshop manual contains technical information to assist with the inspection, servicing and adjustment of fuel-system components.
This information can help when investigating difficult starting, uneven running, reduced engine power, excessive fuel consumption or abnormal exhaust smoke. Fuel-injection components should always be handled carefully and serviced according to the correct workshop procedures.
Cooling System
An efficient cooling system prevents the engine from operating at damaging temperatures. The manual provides information for checking and servicing cooling-system components fitted to the covered engines.
Guidance may relate to coolant circulation, the thermostat, water pump and other associated components. It can assist when investigating overheating, coolant leakage, slow warm-up or abnormal operating temperatures.
Lubrication System
Correct lubrication reduces friction, controls wear and protects the internal engine components. The manual includes information useful when inspecting the oil pump, filters, lubrication passages and related components.
This section can assist with diagnosing low oil pressure, excessive oil consumption, lubricant leakage and signs of insufficient lubrication. The correct oil specifications and servicing procedures should always be followed for the particular engine application.
Engine Dismantling and Reassembly
Structured workshop procedures support both individual component repairs and complete engine overhauls. The manual helps users follow the correct sequence when removing, dismantling, cleaning, inspecting and reassembling engine components.
Following the proper dismantling and assembly order reduces the risk of component damage and makes it easier to organise parts during extensive repair work. Where applicable, the manual provides tightening information, assembly guidance and adjustment procedures.
Inspection and Measurement
Accurate inspection is essential when rebuilding a diesel engine. Components must be checked for wear, cracking, distortion, scoring and other damage before they are approved for reuse.
The manual may provide dimensions, clearances and service limits for components such as cylinder bores, pistons, piston rings, crankshaft journals, bearings, valves and valve guides. These figures help determine whether a part remains serviceable, requires specialist machining or must be replaced.
Fault Diagnosis
The Komatsu 3D68E-3 Workshop Manual provides useful information for methodically investigating engine problems. It can assist with symptoms including:
• Engine will not start
• Difficult starting when hot or cold
• Reduced engine power
• Uneven or unstable running
• Excessive exhaust smoke
• Engine overheating
• Abnormal mechanical noise
• Low lubricating-oil pressure
• High oil consumption
• Fuel, oil or coolant leakage
Using the correct technical information during diagnosis can save workshop time and reduce unnecessary replacement of serviceable components.
Specifications and Technical Data
Accurate specifications are vital when completing engine repairs and adjustments. Depending on the engine model and procedure, the manual may contain component dimensions, inspection limits, operating clearances, adjustment figures and tightening information.
Always select the information for the exact engine model being repaired. Specifications from another engine version should not be used unless the manual confirms they are identical.
Who This Manual Is For
This publication is suitable for:
• Professional diesel-engine technicians
• Agricultural and construction machinery engineers
• Independent repair workshops
• Fleet maintenance departments
• Engine rebuilding specialists
• Machinery owners and operators
• Experienced home mechanics
• Restorers of Komatsu-powered equipment
Digital Workshop Manual
This is a digital PDF workshop manual containing 203 pages. It can be viewed on a computer, laptop, tablet or compatible mobile device. Individual pages may be printed when a paper reference is required beside the engine.
The manual provides a convenient permanent reference for maintaining and repairing engines within the Komatsu 3D68E-3 to 3D88E-3 series. It is particularly useful when an original printed manual has been lost, damaged or is no longer available.
Please confirm that your engine identification falls within the Komatsu 3D68E-3 to 3D88E-3 series before ordering.
This manual is supplied electronically. Download instructions are provided following purchase, and the complete workshop manual is delivered by secure electronic transfer.
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