Yanmar 2QM15 Marine Diesel Engine Service Manual

Official Yanmar 2QM15 Marine Diesel Engine Service Manual

• Covers 1970s–1980s Yanmar 2QM15 and 2QM15G marine diesel engines, documenting the 2-cylinder vertical water-cooled configuration and pre-combustion chamber variants
• Original OEM publication, Yanmar form 2F015A, first issued in Japan
• Contains 47 detailed exploded-view schematics for the base engine, fuel, lubrication, and cooling systems
• Files are delivered as a direct download the moment payment clears
• Indexed PDF search covers every chapter and appendix
• Accessible from your device as soon as the order is placed
• Suitable for printing individual sections for shop-floor use
• This specific edition is the primary technical reference for the 2F015A-series build, detailing the specific tolerances for the fuel injection pump and timing gear train

Engine Construction and Systems

The Yanmar 2QM15 service manual provides a detailed technical walk-through of the marine diesel engine architecture. The documentation explains the construction and inspection of the cylinder block, cylinder head, and the internal moving elements such as the crankshaft, connecting rod, and piston assemblies. The text provides guidance on the fuel system, including the Bosch-type injection pump, injection nozzle, fuel filter, and feed pump operation. The lubricating system and trochoid oil pump are reviewed, alongside the comprehensive cooling system configuration, which features rubber-impeller pumps and specialized thermostat thermal management.

Technical Reference and Specifications

The Yanmar 2QM15 specification section documents critical build parameters and wear limits necessary for engine maintenance. Cylinder head bolt torque is specified at 15–16 kg-m (108.5–115.7 ft-lbs) in the final stage. The intake and exhaust valve clearance is listed at 0.20 mm in the valve specification table. The cooling system operating temperature for the thermostat is documented at 42–52°C for the 2QM15. Lubrication pressure is specified at 2.5–3.5 kg/cm² (35.56–49.78 lb/in.²) at 3,000 rpm. Detailed tolerance charts for valve guides, pistons, and ring grooves ensure precise inspection outcomes. This official 221-page Yanmar OEM workshop manual covers the 2QM15 and 2QM15G, providing the engine, fuel, lubrication, and cooling system specifications for the 2F015A-series marine diesel build.