The YANMAR 3YM Series marine diesel engines, encompassing the 3YM30, 3YM20, and 2YM15 models, represent a line of reliable and efficient naturally aspirated, indirect injection, 4-stroke diesel engines designed for marine applications. These engines feature inline cylinder arrangements, with the 3YM30 and 3YM20 utilizing three cylinders and the 2YM15 employing two. They are engineered with robust construction, incorporating forced lubrication and indirect cooling systems to ensure durability and consistent performance. The series offers various power outputs, from 15 HP to 30 HP, making them suitable for a range of vessel sizes and operational demands, complemented by options for sail drive or inboard transmissions.
This service manual provides comprehensive guidance for the maintenance, repair, and technical understanding of the YANMAR 3YM Series engines. It covers essential areas including detailed engine specifications, lubrication and cooling system requirements, fuel system maintenance, and troubleshooting procedures for common issues. The manual also includes technical data on electrical systems, engine controls, and exhaust configurations, along with vital service standards and tightening torque specifications. Its purpose is to equip owners, technicians, and mechanics with the necessary information to ensure the optimal performance, longevity, and safe operation of these marine diesel engines.
YANMAR 3YM30 3YM20 2YM15 MARINE DIESEL ENGINE SERVICE MANUAL
Yanmar 3YM30 3YM20 2YM15 AND 3YM SERIES ENGINES
CONTENTS
General
Inspection and adjustment
Troubleshooting
Disassembly and reassembly
Inspection and servicing of basic engine parts
Intake and exhaust system
Lubrication system
Cooling water system
Remote control
Electrical system
Service standards
Tightening torque for bolts and nuts
YANMAR 3YM30 3YM20 2YM15 MARINE DIESEL ENGINE SERVICE MANUAL
Yanmar 3YM30 3YM20 2YM15 AND 3YM SERIES ENGINES
CONTENTS
General
Inspection and adjustment
Troubleshooting
Disassembly and reassembly
Inspection and servicing of basic engine parts
Intake and exhaust system
Lubrication system
Cooling water system
Remote control
Electrical system
Service standards
Tightening torque for bolts and nuts
