Model:
YM Series marine diesel engines
Model Variants:
3YM30, 3YM20, 2YM15
Production Years Covered:
2005 model year and related service period
Engine Type:
Four-stroke, water-cooled marine diesel
Application:
Marine propulsion and auxiliary use
Manual Type:
Official factory service and repair manual (PDF)
Models Covered:
3YM30, 3YM20, 2YM15
Target Audience:
Marine technicians, boatyards, fleet operators, and DIY boat owners
Intended Use:
Professional service, maintenance, repair, and rebuild of YM-series engines
Model Range:
Covers the complete YM series: 2YM15, 3YM20, and 3YM30
Depth:
Factory-level specifications, procedures, and torque data
Format Advantage:
Searchable PDF with instant download
Repair Focus:
Step-by-step servicing and overhaul guidance
Coverage Areas:
Engine, fuel system, cooling system, electrical, and transmission servicing
Manual Type:
Factory service and repair manual
Delivery:
Instant download
Page Count:
N/A - page count not specified for this listing
Intended Use:
Reference, maintenance, and repair
Engine Mechanical:
Cylinder head, block, pistons, crankshaft, and bearings
Fuel System:
Fuel injection pump, injectors, fuel lines, and filters
Cooling System:
Sea water pump, fresh water pump, heat exchanger, and thermostat
Lubrication System:
Oil pump, oil filter, and oil circuit
Electrical System:
Alternator, starter motor, wiring, and sensors
Transmission:
Marine gear and reduction gear service
Intake and Exhaust:
Air intake, exhaust manifold, and mixing elbow
Diagnostics:
Troubleshooting charts and fault diagnosis
Disassembly:
Engine removal, teardown, and component disassembly
Inspection:
Component inspection and measurement procedures
Reassembly:
Assembly, adjustment, and installation
Adjustments:
Valve clearance, injection timing, and belt tension
Testing:
Engine testing, break-in, and performance checks
Specifications:
Clearances, limits, and torque values
Diagrams:
Exploded views and component illustrations
Maintenance Schedules:
Routine service and interval tables
Service Data:
Capacities, pressures, and wear limits
Part Identification:
Component names and reference numbers where provided
Replacement:
Remove-and-replace procedures for common components
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:
Yanmar YM series four-stroke marine diesel
Configuration:
2-cylinder and 3-cylinder options
2YM15 Displacement:
0.9 L class (2-cylinder)
3YM20 Displacement:
1.1 L class (3-cylinder)
3YM30 Displacement:
1.3 L class (3-cylinder)
2YM15 Output:
Approximately 14 hp
3YM20 Output:
Approximately 20 hp
3YM30 Output:
Approximately 29 hp
Cooling:
Fresh water (indirect) cooling with heat exchanger
Fuel System:
Indirect injection with mechanical injection pump
Aspiration:
Naturally aspirated
Combustion:
Direct injection, four-stroke diesel cycle
Standard Transmission:
Yanmar marine gear (reduction ratio options)
Optional Transmission:
Various reduction gear ratios available by application
Clutch:
Mechanical multi-plate marine clutch
Control:
Mechanical shift lever
Cooling:
Transmission cooled via engine cooling circuit
Propeller Shaft:
Standard marine output flange
Ratio Options:
N/A - exact ratios vary by installation
2YM15 Length:
Compact 2-cylinder footprint
3YM20 Length:
Standard 3-cylinder footprint
3YM30 Length:
Larger 3-cylinder footprint
Orientation:
Horizontal shaft configuration for marine installation
2YM15 Dry Weight:
Approximately 180 kg class
3YM20 Dry Weight:
Approximately 200 kg class
3YM30 Dry Weight:
Approximately 230 kg class
Engine Protection:
Low oil pressure and high coolant temperature alarms (application dependent)
Cooling:
Seawater and fresh water cooling circuits
Enclosure:
Marine-grade corrosion-resistant castings
Shielding:
Guards over rotating and hot components
Certification:
Built to meet applicable marine emission and safety standards
Governor:
Mechanical centrifugal governor
Starting:
12V electric starter
Charging:
12V alternator charging system
Monitoring:
Senders for oil pressure and coolant temperature
Control Panel:
Ignition, start, and alarm indicators
Oil Change:
Per factory interval schedule (hours-based)
Oil Filter:
Replace at each oil change
Fuel Filters:
Replace at scheduled intervals
Sea Water Pump Impeller:
Inspect and replace at scheduled intervals
Coolant:
Check level regularly, replace per schedule
Valve Clearance:
Check and adjust at scheduled intervals
Engine Oil:
Marine diesel engine oil, viscosity per ambient temperature
Coolant:
Fresh water coolant with corrosion inhibitor
Sea Water Pump Impeller:
Regular replacement item
Impeller and Belts:
Inspect for cracking and wear
Anodes:
Inspect and replace to prevent corrosion
