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General| Engine Model | 3GM30F |
|---|---|
| Number of Cylinders | 3 |
| Fuel Type | Diesel |
| Aspiration | Natural |
| Combustion System | Indirect Injection |
| Compression Ratio | 23:1 |
| Lubrication System | Forced Lubrication by Trochoid Pump |
| Engine Type | Vertical, Water Cooled, 4-Stroke Diesel Engine |
| Rated Output | 20.1 kW (27.4 mhp) / 3600 rpm |
| Cooling System | Fresh water cooling, with heat exchanger |
| Starting System | Electric Start |
| Alternator | 35 A |
| Max Torque | 71.6 Nm (52.8 lb-ft) / 2400 rpm |
Provides general information for engine owners and mechanics.
Explains the meaning of NOTE, CAUTION, and WARNING terms used in the manual.
Offers essential safety rules and precautions for servicing the machine.
Provides practical advice and tips for performing service procedures.
Guides on ordering and identifying correct replacement parts by model number.
Lists general torque specifications for nuts and bolts not found elsewhere.
Details on different types of fasteners, threads, nuts, bolts, and their properties.
Describes essential hand tools required for mechanical work and their proper use.
Details various precision tools needed for accurate measurements in service.
Covers procedures for removing, installing, and handling bearings.
Provides guidelines for removing and installing seals to prevent damage.
Covers common starting system problems, operation, and troubleshooting steps.
Outlines components, common issues, and testing procedures for the charging system.
Discusses common fuel system issues, symptoms, and troubleshooting steps.
Covers troubleshooting for engine overheating and cooling system issues.
Explains how to interpret different colors of exhaust smoke for diagnosis.
Discusses common engine noises and their potential causes.
Provides troubleshooting steps for common engine operational issues.
Diagnoses causes for low engine oil pressure and testing procedures.
Covers lubrication system diagrams and oil pressure testing.
Daily checks to perform before starting the engine for safe operation.
Step-by-step procedure for starting the engine safely.
Proper procedure for shutting down the engine to prevent damage.
Maintenance tasks to perform after each use of the boat.
Guidelines for regular maintenance and lubrication intervals.
Importance of clean fuel and maintaining the fuel system for diesel engines.
Instructions for removing and cleaning the air filter element.
Guidance on inspecting, adjusting, and replacing drive belts.
Information on checking and replacing sacrificial anodes for corrosion protection.
Procedures for performing a tune-up to restore engine performance.
How to perform a compression test as the first step of a tune-up.
Step-by-step guide to adjusting valve clearance for proper engine operation.
Procedures for adjusting the engine's idle speed.
Details recommended transmission oil types and change intervals.
Essential preparation steps for storing the engine during off-season.
Procedures for properly draining cooling systems for winter storage.
Steps to drain the seawater cooling system to prevent freezing damage.
Procedure for adding antifreeze to the cooling system for storage.
Instructions for draining the freshwater cooling system if necessary.
Steps for preparing the boat and engine for use after storage.
Explains the basic principles of diesel engine operation and compression ignition.
Safety warnings and precautions for removing the engine.
General instructions for removing and installing the engine.
Procedure for removing and installing the valve cover.
Step-by-step instructions for removing the cylinder head.
Guidance on servicing valves, guides, and seats, recommending professional service.
Covers removal and installation of piston and connecting rod components.
How to measure piston and cylinder bore for wear.
Procedures for removing and reinstalling the timing gearcase.
Information on inspecting and replacing crankshaft main and thrust bearings.
Steps for removing and installing the camshaft and related components.
Procedures for cleaning and inspecting the cylinder block.
Instructions for removing and installing core plugs in the cylinder block.
Locating and recording engine serial and model numbers for parts ordering.
Guidance on selecting correct marine-grade replacement parts.
Safety warnings and general precautions for engine handling and service.
General procedures for removing and reinstalling multicylinder engines.
Procedures for removing and installing the valve cover on multicylinder engines.
Procedures for removing and installing the exhaust manifold.
Step-by-step guide to removing the cylinder head.
Guidance on servicing valves, guides, and seats, recommending professional service.
Covers removal and installation of piston and connecting rod components.
How to measure piston diameter and cylinder bore for wear.
Procedures for removing and reinstalling the timing gearcase.
Information on inspecting and replacing crankshaft main and thrust bearings.
Procedures for cleaning and inspecting the cylinder block.
Instructions for removing and installing core plugs in the cylinder block.
Explains the basic principles of diesel engine fuel injection.
Details on the fuel injection pump's function and precision requirements.
Explains the function of the fuel transfer pump and its operation.
Procedure for bleeding air from the fuel system to prevent engine issues.
Discusses the role of the fuel injector and its precision requirements.
Steps for removing and installing the fuel injection pump.
Explains the importance of proper injection timing for combustion.
Guidance on inspecting and replacing fuel lines to prevent leaks.
Explains the governor system's function in maintaining engine speed.
Procedures for removing, inspecting, and installing the governor assembly.
Covers components and operation of the standard seawater cooling system.
Explains the operation of the freshwater cooling system.
Details on the heat exchanger's function and maintenance.
Procedures for removing and installing thermostats.
Troubleshooting steps for an overheated engine.
Guidance on inspecting and replacing cooling system hoses.
Instructions for inspecting, adjusting, and replacing drive belts.
Covers the seawater pump, its operation, and maintenance.
Procedures for removing and installing the seawater pump.
Procedures for pressure testing the cooling system for leaks.
Procedures for inspecting and maintaining the battery and its connections.
How to check and maintain the battery's electrolyte level.
Methods for testing battery condition using a hydrometer.
Procedures for charging the battery, including jump-starting safety.
Steps and warnings for jump-starting a discharged battery.
Information on battery cutoff switches and their function.
Components and preliminary testing of the charging system.
Steps for removing and installing the starter motor.
Procedures for removing and installing the starter solenoid.
Steps for replacing starter motor brushes.
Information on key, start, and battery cutoff switches.
How to check the oil pressure sender for proper operation.
Procedures for checking the coolant temperature sender.
Explanation of warning lamps for engine conditions.
Procedures for testing the alarm buzzer for proper function.
Explains how the tachometer works and its sensor location.
Explains how power is transmitted through the KM series transmissions.
Exploded view and parts list for the shifter assembly.
Exploded view and parts list for the shifter assembly.
Procedures for removing and installing the KM series transmission.
Steps for disassembling the KM series transmission.
Inspection procedures for the input shaft and its bearings.
Procedures for inspecting the output shaft, gears, and bearings.
Procedures for adjusting bearing preload using shims.
Information on the drive disc, its function, and replacement criteria.
Steps for removing and installing the drive disc.
Explains how power is transmitted through the KBW series transmissions.
Step-by-step procedures for disassembling the KBW transmission.
Procedures for inspecting the input shaft and its bearings.
Inspection of the intermediate shaft, gears, and bearings.
Procedures for inspecting the output shaft, gears, bearings, and clutch components.
Steps for reassembling the transmission components.
Wiring diagram for early models with a large instrument panel.
Wiring diagram for early models with a small instrument panel.
Wiring diagram for late models with a large instrument panel.
Wiring diagram for late models with a small instrument panel.
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