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Yanmar Mase Marine Generators IS 5.0 IS 6.0 Workshop Manual
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🏷️ Basic Information Identification Make: Yanmar Product line: Mase marine generators Models covered: IS 5.0, IS 6.0 Model variants: IS 5.0 and IS 6.0 generator sets Production years covered: N/A...
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Tipo: Engine
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SKU: 54338
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🏷️ Basic Information
Identification
Make:
Yanmar
Product line:
Mase marine generators
Models covered:
IS 5.0, IS 6.0
Model variants:
IS 5.0 and IS 6.0 generator sets
Production years covered:
N/A - production years not stated in the source description
Document type:
Workshop (service and repair) manual
Manual Application
Intended equipment:
Yanmar Mase marine generator sets
Audience:
Marine technicians, marine electricians, boat owners performing their own maintenance
Delivery:
Instant digital download
👋 Introduction
Market Position
Target audience:
Marine service technicians, boatyards, marine electricians and owner-operators
Application:
Auxiliary power generation aboard recreational and light commercial vessels
Typical use:
Onboard AC power supply while underway or at anchor; shore-power supplement / replacement
Key Features
Purpose of manual:
Factory-level service, repair and overhaul procedures for the IS 5.0 and IS 6.0 generator sets
Advantage:
Single-source reference for engine, generator end and control system work instead of scattered supplier documentation
Engine platform:
Yanmar single-cylinder industrial diesel used in the IS series gensets
Cooling and exhaust:
Raw-water cooled marine installation with wet exhaust
Enclosure:
Sound-attenuated marine generator enclosure
📋 Manual Details
Document
Manual type:
Workshop / service and repair manual
Coverage areas:
IS 5.0 and IS 6.0 diesel generator sets
Language:
English
File format:
PDF
Delivery method:
Instant download
Binding:
Digital (not a printed book)
Page count:
N/A - page count not stated in the source description
Using the Manual
Navigation:
Bookmarked PDF with searchable text for quick lookup of sections and specifications
Printing:
PDF can be printed or used on a laptop or tablet at the vessel
Applicability:
Written for the IS 5.0 and IS 6.0 generator sets; verify serial number and build before ordering parts
📖 Manual Coverage
Engine and Fuel
Engine mechanical:
Cylinder head, valve clearance, piston, rings, cylinder bore and connecting rod service
Crankshaft and bearings:
Crankshaft inspection, main and connecting rod bearing clearances
Crankcase and lubrication:
Oil pump, relief valve, oil filter and lubrication circuit
Fuel system:
Fuel injection pump, injector, fuel filter, priming and bleeding procedure
Governor:
Mechanical governor adjustment and speed setting
Air intake:
Air cleaner service and intake restrictions
Cooling, Exhaust and Electrical
Cooling system:
Raw-water pump, impeller, hoses, thermostat and heat exchanger / coolant passages
Exhaust system:
Wet exhaust mixing elbow, exhaust hose routing and water injection point
Starting system:
Starter motor, battery connections, glow plugs and starting circuit
Charging system:
Alternator and regulator service
Wiring:
Wiring diagrams, connector identification, harness routing
Generator End and Controls
Alternator (generator end):
Stator, rotor, exciter, rotating rectifier and bearing service
Voltage regulation:
AVR (automatic voltage regulator) adjustment and testing
Control panel:
Start/stop controls, gauges, indicators, hour meter and shutdown devices
Protection circuits:
Low oil pressure, high coolant temperature and over-speed shutdowns
Electrical output:
Marine AC output configuration; verify the rating plate for voltage, frequency and phase on the specific unit
Procedures and Technical Depth
Troubleshooting:
Fault diagnosis flow for no-start, no-output, overheating, low output and unstable voltage
Disassembly and assembly:
Step-by-step teardown, inspection and reassembly with tightening sequences
Torque specifications:
Fastener torque values for engine and generator end
Measurement and adjustment:
Clearances, wear limits and adjustment values
Maintenance schedule:
Routine service intervals and inspection points
Parts information:
Component identification, exploded views and part references for ordering
Drawings:
Sectional illustrations and diagrams supporting the procedures
Scope Notes
Model variations:
Some values differ between the IS 5.0 and IS 6.0; confirm which model applies
Not covered:
Vessel hull, shore power inlet and onboard distribution wiring beyond the generator connections
Specification source:
Use the manual and the unit rating plate as the authority for exact values
📊 Manual Specifications
File & Compatibility
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print & Binding
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
⚙️ Engine Specifications
Engine
Engine type:
Yanmar single-cylinder, four-stroke, water-cooled marine diesel
Engine options:
One engine platform shared by the IS 5.0 and IS 6.0 generator sets
Combustion:
Direct injection diesel
Cylinder count:
1
Cooling:
Raw-water cooled with heat exchanger / coolant circuit
Rated engine speed:
1500 rpm at 50 Hz; 1800 rpm at 60 Hz
Displacement:
N/A - not stated in the source description
Bore and stroke:
N/A - not stated in the source description
Performance and Fuel
Generator output:
IS 5.0: nominal 5 kW class; IS 6.0: nominal 6 kW class
Output voltage and frequency:
Available in 50 Hz and 60 Hz versions; check the unit rating plate
Fuel system:
Mechanical fuel injection pump with injector
Fuel type:
Marine diesel fuel
Fuel filtration:
Primary fuel filter / water separator plus engine-mounted filter
Governor:
Mechanical governor controlling engine speed under load
Lubrication:
Pressure-fed lubrication with full-flow oil filter
Starting:
Electric start with starting battery
🔧 Transmission
Drive Arrangement
Standard transmission:
Direct-coupled engine to generator; no marine gearbox is used on a generator set
Coupling:
Flexible coupling / drive disc between engine flywheel and generator rotor
Generator mounting:
Single-bearing or two-bearing generator end bolted to the engine bell housing
Optional transmission:
N/A - no optional gearbox offered for this generator set
Belt drive:
N/A - generator is direct coupled, not belt driven
Related Drive Features
Speed control:
Engine speed held constant by the governor to maintain output frequency
Alignment:
Coupling and shaft alignment checks covered in the manual
Vibration:
Flexible mounts and coupling absorb engine and rotor vibration
📐 Dimensions
Weights
Curb weight (dry):
N/A - not stated in the source description; varies with enclosure and options
Wet weight:
N/A - not stated in the source description
Exterior
Wheelbase:
N/A - not applicable, this is a stationary marine generator set
Overall length:
N/A - not stated in the source description
Overall width:
N/A - not stated in the source description
Overall height:
N/A - not stated in the source description
Mounting:
Rigid or flexible mounts to a solid, level engine bed in the vessel
🛡️ Safety Features
Shutdown Protection
Low oil pressure:
Automatic shutdown to protect the engine
High coolant / exhaust temperature:
Automatic over-temperature shutdown
Over-speed:
Over-speed shutdown to protect the generator end
Overcrank / start protection:
Start circuit protection prevents continuous cranking
Electrical Safety
Circuit protection:
Output circuit breakers protecting the AC supply
Insulation:
Insulated windings and equipment earthing / bonding
Enclosure:
Sound-attenuated enclosure with guarded rotating parts and hot surfaces
Crash test ratings:
N/A - not applicable to a marine generator set
💡 Technology Features
Control and Monitoring
Control panel:
Start/stop controls with local instrumentation
Instrumentation:
Hour meter with oil pressure and coolant temperature monitoring
Indicators:
Charge, oil pressure and fault indicator lamps on the panel
Shutdown interface:
Fault shutdowns wired to the control panel for operator indication
Electrical Output
Voltage regulation:
Automatic voltage regulator (AVR) holding output voltage under load
Audio / infotainment:
N/A - not applicable to a marine generator set
Driver assistance:
N/A - not applicable to a marine generator set
🔧 Maintenance
Service Intervals
Daily / pre-start:
Check engine oil level, coolant level, fuel and water separator; inspect for leaks
First 50 hours:
Initial oil and filter change and general inspection
Every 250 hours or annually:
Engine oil and oil filter change; fuel filter service
Every 500 hours:
Air cleaner service and cooling system inspection
Raw-water pump impeller:
Inspect regularly; replace on the interval given in the manual or at signs of wear
Valve clearance:
Check and adjust at the interval given in the manual
Fluids and Common Wear Items
Engine oil:
Use the viscosity and API grade specified in the manual for the ambient temperature range
Oil capacity:
N/A - not stated in the source description
Coolant:
Use the coolant specification given in the manual; raw-water cooled units use seawater for the raw circuit
Fuel:
Clean marine diesel, water and contamination kept out of the system
Common wear items:
Raw-water pump impeller, drive coupling, belts where fitted, filters, hoses and anodes
Known service points:
Exhaust mixing elbow corrosion, seawater-side cooling fouling, fuel system air ingress and battery / charging faults
📚 Vehicle History
Brand and Model
Manufacturer:
Yanmar
Brand of generator set:
Mase Generators
Model line:
IS series marine generator sets
Models in this manual:
IS 5.0 and IS 6.0
Product type:
Diesel auxiliary generator set for marine use
Model evolution:
N/A - not stated in the source description
Production location:
N/A - not stated in the source description
🏆 Awards & Recognition
Recognition
Awards for model or era:
N/A - not stated in the source description
Industry standing:
Yanmar diesel engines and Mase generator sets are established names in marine auxiliary power
Basis of reputation:
Compact, reliable single-cylinder diesel generator sets suited to smaller engine rooms