Model:
6LYA / 6LY2 / 6LY2A
Engine Type:
Marine diesel engine, inline 6-cylinder
Application:
Pleasure craft and light commercial marine propulsion
Models Covered:
6LYA, 6LY2, 6LY2A marine diesel engines and variants
Production Years:
N/A - not specified for this model
Documentation Type:
Factory workshop (service) manual
Target Audience:
Marine technicians, boatyard service departments, and experienced DIY owners servicing Yanmar 6LY series engines
Product Class:
High-output marine diesel propulsion engine for inboard applications
Power Density:
Compact inline-6 layout delivering high horsepower relative to installed size
Serviceability:
Common rail architecture with accessible service points for routine maintenance
Fuel Delivery:
Common rail direct injection diesel system
Cooling:
Freshwater-cooled with seawater heat exchanger
Manual Type:
Official workshop / service manual
Coverage Areas:
General information, engine mechanical, fuel system, cooling and lubrication, electrical, troubleshooting, disassembly and reassembly
Delivery Method:
Instant download after purchase
Binding:
Digital (PDF document)
Page Count:
N/A - not specified for this model
Engine Mechanical:
Cylinder block, head, pistons, crankshaft, valvetrain, timing gear
Fuel System:
Common rail injection pump, injectors, fuel filters, supply lines
Lubrication System:
Oil pump, oil cooler, pressure regulator, filter circuits
Cooling System:
Freshwater pump, seawater pump, heat exchanger, thermostat
Intake and Exhaust:
Turbocharger, intercooler, exhaust manifold and mixing elbow
Electrical System:
Starting motor, alternator, sensors, wiring diagrams
Engine Control:
ECU, throttle and shift control interfaces
Troubleshooting:
Symptom-based fault diagnosis with test procedures
Disassembly and Reassembly:
Step-by-step procedures with special tool callouts
Inspection and Measurement:
Wear limits and service standard tables
Adjustment Procedures:
Valve clearance, belt tension, injection system checks
Torque Specifications:
Fastener torque values for all major assemblies
Level:
Professional workshop-level detail for complete engine overhaul
Diagrams:
Exploded views, schematics, and wiring diagrams
Special Tools:
Listed where required for specific procedures
Part Numbers:
Referenced throughout procedures where applicable
Wear Limits:
Factory service limits and standards provided in tables
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 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
Primary Engine:
Yanmar 6LY series inline 6-cylinder turbocharged diesel
Displacement:
Approximately 4.2 liters
Aspiration:
Turbocharged with intercooler
Valvetrain:
Overhead valve, 4 valves per cylinder (confirm with manual)
Power Output:
Approximately 315-440 hp depending on 6LYA / 6LY2 / 6LY2A variant
Rated Speed:
Approximately 3,000-3,800 rpm depending on variant
Emissions:
N/A - not specified for this model
Fuel Delivery:
Common rail direct injection
Fuel Filtration:
Primary and secondary fuel filters
Configuration:
Inline 6-cylinder marine diesel
Length x Width x Height:
N/A - consult manual for exact per-variant dimensions
Dry Weight:
N/A - not specified for this model
Mounting:
Flexible engine mounts on marine engine beds
Shaft Coupling:
Standard SAE marine gear interface (see manual for details)
Engine Protection:
Overheat, low oil pressure, and overspeed protection via sensors and ECU shutdown
Alarms:
Audible and visual alarm outputs for critical fault conditions
Emergency Stop:
Remote stop solenoid support for bridge-mounted shutdown
Crash Test Ratings:
N/A - not applicable to a marine diesel engine
Fuel Injection:
Common rail electronic diesel injection
Engine Management:
Electronic control unit (ECU) governing fuel delivery and protection
Diagnostics:
Fault code output and sensor-based diagnostic procedures covered in manual
Instrumentation:
Tachometer with hour meter, coolant temperature, oil pressure, alarm panel
Driver Assistance:
N/A - not applicable to a marine diesel engine
Engine Oil and Filter:
Per factory schedule in manual; typical marine interval every 100-250 hours or annually
Fuel Filters:
Inspect regularly; replace per hour-based schedule
Coolant:
Replace per factory interval with specified long-life coolant
Valve Clearance:
Check and adjust at specified hour intervals
Seawater Pump Impeller:
Inspect annually or per interval
Engine Oil:
CCMC/API-rated diesel engine oil per Yanmar specification in manual
Coolant:
Ethylene glycol long-life coolant with soft water
Gear Oil:
N/A - transmission not covered in this engine manual
Impellers:
Seawater pump impeller is a common wear item requiring periodic replacement
Anodes:
Zinc anodes in cooling circuit require regular inspection and replacement
Belts:
Alternator and freshwater pump belts subject to wear
Exhaust Elbow:
Mixing elbow subject to corrosion over time
Manufacturer:
Yanmar Co., Ltd., Japanese diesel engine manufacturer founded in 1912
Marine Reputation:
Long-established supplier of compact, high-output marine diesel propulsion engines
6LY Series:
High-horsepower inline-6 marine diesel family for pleasure craft
6LYA:
Earlier generation of the 6LY line with electronic governed fueling
6LY2 / 6LY2A:
Updated variants with increased output and refined common rail systems
Country of Manufacture:
Japan
Plant:
N/A - not specified for this model
