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