Yanmar 3YM30/3YM20/2YM15 Marine Diesel Engine Service Manual

Yanmar 3YM and 2YM Marine Diesel Series Technical Documentation

• Covers 2004–2008 Yanmar 3YM30, 3YM30C, 3YM20, 3YM20C, 2YM15, and 2YM15C marine diesel engines with KM2P-1 or SD20 drive systems
• Official Yanmar publication P/N M9961-03E101, March 2004 edition with 2005 revision updates
• Includes 10 detailed piping diagrams, 8 troubleshooting logic charts, and torque specification tables for main bolts and nuts
• Delivered as a direct download the moment payment clears
• Indexed PDF search covers every chapter and appendix
• Stored against your account so you can retrieve it after a hard-drive loss
• This 231-page factory manual is the reference used for the 3YM and 2YM engine series, documenting installation and service parameters

Engine Series Coverage and Maintenance Scope

The 2004–2008 Yanmar 3YM30, 3YM20, and 2YM15 service manual provides technical data and maintenance procedures for the Yanmar 3YM series and 2YM15 marine engines. The document structure guides the user through exterior component identification, fuel and lubrication system requirements, and comprehensive cooling water circuit layouts. Detailed sections address periodic inspection schedules, ranging from daily pre-start checks to 1,000-hour or four-year interval service milestones for engine timing, valve clearances, and cooling system impeller maintenance. Troubleshooting support is provided through systematic reference charts covering engine stops, uneven output, and starting difficulties.

Specification Highlights and Reference Data

Technical data includes specific rotational tightening values for internal engine fasteners and complete fluid capacity documentation. The cooling water capacity is documented at 4.9 L for the 3YM30 engine and 3.0 L for the 2YM15, with coolant recovery tank capacities of 0.8 L across all models. Intake/exhaust valve clearance is specified at 0.15–0.25 mm, with injection timing variations for each model variant to accommodate fuel temperature differences. Standard electrical system parameters list a 60A AC generator as primary, with 80A as an optional upgrade. Compression pressure test values are documented at 3.43 MPa for the 3YM30 and 3.23 MPa for the 3YM20/2YM15 engines. A 231-page Yanmar OEM workshop manual covering the 2004–2008 3YM30, 3YM20, and 2YM15 marine diesel engines, documenting mechanical, electrical, and cooling system specifications for the Yanmar YM-series build.