Model Variants:
6LYM-UTE, 6LYM-STE, 6LY3-ETP, 6LY3-STP, 6LY3-UTP, 6LY2-STE, 6LY2A-STP, 6LYA-STP
Intended Use:
Marine Diesel
Production Years Covered:
N/A - not specified for this manual
Target Audience:
Sales, Service, Inspection, and Maintenance Engineers
Application:
Marine propulsion and auxiliary power
Engine Type:
In-line 6-cylinder turbocharged and intercooled diesel
Valvetrain:
DOHC (Double Overhead Camshaft)
Fuel System:
Common Rail Direct Injection (for newer variants like 6LY3 series)
Cooling System:
Heat Exchanger or Keel Cooling (typical for marine diesel)
Engine Mechanical:
Cylinder head, valve train, pistons, connecting rods, crankshaft, bearings, camshaft, timing gears
Lubrication System:
Oil pump, oil cooler, oil filter, relief valves, lines and fittings
Cooling System:
Heat exchanger, raw water pump, coolant pump, thermostat, keel cooling components
Fuel System:
Common rail components, high-pressure pump, injectors, fuel filters, fuel lines
Turbocharger and Intercooler:
Turbocharger assembly, aftercooler, wastegate (if equipped), associated piping
Electrical System:
Alternator, starter motor, wiring harness, sensors, ECU, instrument panel
Marine Gearbox:
Transmission removal, installation, linkage adjustment, general service
Diagnostic Procedures:
Troubleshooting charts, fault codes, symptom-based diagnostics
Disassembly and Assembly:
Step-by-step engine overhaul with torque specifications and sequences
Adjustments:
Valve clearance, injection timing (if applicable), belt tension, governor settings
Testing:
Compression test, oil pressure test, cooling system pressure test, electrical component tests
Specifications:
Complete torque values, clearances, wear limits, and service data
Diagrams:
Exploded views, cross-sections, wiring schematics, flow charts
Part Numbers:
Genuine YANMAR part numbers for serviceable components
Component Identification:
Visual identification of parts with OEM numbering
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
Engine Type:
In-line 6-cylinder Diesel
Aspiration:
Turbocharged & Intercooled (implied by model suffixes like ETP, STP, UTP)
Valvetrain:
DOHC (Double Overhead Camshaft)
Displacement:
7.07 L (7070 cc)
Power Output Range:
Likely ranges from 300 HP to over 400 HP depending on specific model variant (e.g., 6LY2A-STP typically around 370 HP, 6LY3-ETP around 400 HP)
Cooling System:
Heat Exchanger or Keel Cooling (typical for marine diesel)
Injection System:
Common Rail Direct Injection (for newer variants like 6LY3 series)
Emissions Compliance:
Varies by model and region, but likely meets EPA Tier 2/3 and EU RCD standards for certain variants
Type:
Marine Gearbox (compatible with various marine transmissions and drives)
Drive Options:
Shaft Drive, Sterndrive (depending on vessel configuration)
Control:
Mechanical or electronic shift and throttle controls
Reduction Ratio:
N/A - varies by transmission model and vessel application
Ratings / Crash Test Information
Crash Test Ratings:
N/A - not applicable for marine engine
Engine Protection:
Low oil pressure shutdown, high coolant temperature alarm, over-rev protection
Guards:
N/A - not specified for this model
Oil Change Interval:
Typically every 200-250 operating hours or annually (whichever comes first, refer to manual)
Fuel Filter Replacement:
Recommended at regular intervals as per manual, typically 250-500 hours
Impeller Replacement:
Annually or as needed based on operating conditions
Engine Oil Capacity:
Approx. 12-14 Liters (typical for this engine size, refer to specific model for exact)
Coolant Capacity:
Varies with vessel installation, but engine block capacity is approximately 8-10 Liters
Known Issues / Common Wear Items
Common Wear Items:
Impeller, belts, hoses, filters, zinc anodes
Known Issues:
N/A - not specified for this manual
Evolution:
The 6LY series evolved over time with variants like 6LY, 6LY2, 6LY2A, 6LY3, and 6LYM, introducing improvements in fuel system, power output, and emissions compliance.
Production Location:
N/A - not specified for this model
