Yanmar 2QM15 Marine Diesel Engine Service & Repair Manual
Part No. 2F015A.
Yanmar Models Covered & Key Technical Specifications
Models: Yanmar 2QM15, Yanmar 2QM15G
Sub-models / Variants: 2-cylinder vertical water-cooled diesel, Pre-combustion type
Model Years: 1970s–1980s
Serial Numbers: 2F015A
Technical Data:
- Engine displacement: 0.662 L
- Number of cylinders: 2
- Bore x stroke: 75 mm x 75 mm
- Continuous rated output: 14 HP at 3000 rpm
- One hour rating: 15 HP at 3000 rpm
- Compression ratio: 23:1
- Injection pressure: 160 ±10 kg/cm²
- Engine weight (dry): 145 kg
- Lubricating oil capacity (total): 2.5 L
- Thermostat opening temperature: 42°C ±2°C
- Thermostat full open temperature: 52°C ±2°C
Yanmar Manual Features & Content Preview
Yanmar 2QM15 Marine Diesel Engine OEM Service Manual
- Covers 1970s–1980s Yanmar 2QM15 and 2QM15G marine diesel engines, including 2-cylinder vertical water-cooled and pre-combustion variants
- Original 221-page OEM publication (Yanmar form 2F015A) featuring 47 exploded-view schematics for the base engine, fuel, lubrication, and cooling systems
- Delivered as an instant download for immediate, on-demand shop-floor access
- Essential reference material for accurate marine engine repair
Engine Construction and Systems
Mechanics and marine technicians know that guesswork does not belong in the engine room. This manual provides a comprehensive look at the engine's architecture, offering the technical descriptions needed for thorough overhauls and routine maintenance. It details the cylinder block, cylinder head, and internal rotating assemblies like the crankshaft and pistons. You get clear operational data for the Bosch-type injection pump, fuel filter, and feed pump. Working on marine diesel systems carries inherent risks, so referencing factory-approved tolerances is crucial to maintain safe operating pressures and prevent catastrophic failure. The documentation also covers the complete cooling system configuration, including rubber-impeller pumps and specialized thermal management.
Technical Reference and Specifications
Having the right numbers on hand speeds up any repair. This guide outlines the critical wear limits and build parameters for the 2F015A-series. Final stage cylinder head bolt torque is strictly rated at 15–16 kg-m (108.5–115.7 ft-lbs). The valve specification table dictates an intake and exhaust clearance of 0.20 mm. For the cooling system, the thermostat operates within a defined window of 42–52°C. You will also find the precise lubrication pressure requirement of 2.5–3.5 kg/cm² (35.56–49.78 lb/in.²) at 3,000 rpm. Exhaustive tolerance charts for valve guides, pistons, and ring grooves remove the guesswork from your inspection process, ensuring your work meets original factory standards.
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