Yanmar 2YM15 Compact Auxiliary Marine Diesel Engine

Description

Command steady coastal sailing auxiliary power using Yanmar 2YM15 Auxiliary Marine Engine packages, designed to repower small cruising sailboats and pocket cruisers up to 28 feet. Displacing 570 cc across two inline cylinders, this naturally aspirated diesel produces 14 horsepower at 3,600 RPM. Indirect swirl pre-combustion chamber injection ensures clean fuel atomization, low smoke emissions, and smooth torque delivery.

High-tensile gray cast iron forms the monolithic cylinder block, equipped with induction-hardened cylinder walls that resist scuffing. A fresh water cooling system integrates an aluminum heat exchanger housing with a cupronickel tube bundle and bronze sea water pump. Dry engine weight without transmission is 227 lbs, supported by a 2.1-quart stamped oil pan, SAE 6 housing, and 0.312-inch fuel connections.

Key Features of Yanmar 2YM15

Sailboat owners buy Yanmar 2YM15 inboard engine packages to replace obsolete raw-water cooled engines inside compact sailboat engine compartments. The balanced two-cylinder configuration delivers dependable auxiliary propulsion without adding excess ballast or creating excessive vibration inside living areas.

• 14 horsepower rating propels small displacement sailing craft at hull speed in head seas.
• 125-amp 12-volt alternator with built-in charging sensor recharges house battery banks.
• Rigid cast iron engine block suppresses vibration across low and high RPM ranges.
• Cupronickel tube heat exchanger protects cylinder jackets from salt scale accumulation.
• Electric glow plugs initiate rapid combustion down to freezing bilge temperatures.
• Yanmar 2YM15 auxiliary efficiency lowers fuel burn on extended coastal passages.
• Flexible rubber engine mounts dampen two-cylinder reciprocating pulses to protect stringers.
• Front-mounted sea water pump allows quick neoprene impeller replacement through hatch doors.

Combustion Dynamics Thermal Capacities

Coolant thermostats regulate internal temperatures between 165°F and 180°F under continuous motoring operations. The two-cylinder block develops 24 lb-ft of torque at 2,400 RPM, giving small displacement sailboats power to punch through tidal headlands and harbor chop. Rated for M4 pleasure craft service, thermal heat rejection transfers 11 kW into raw water cooling circuits. Specific fuel consumption averages 245 g/kWh, burning about 0.25 gallons per hour at standard yacht cruising speeds across open coastal waters.

Exhaust Integration Bay Clearances

A water-injected exhaust elbow attaches to 2.0-inch wet exhaust hose, meeting ABYC P-1 standards for auxiliary sailboats. Mounting brackets adjust across 14-inch to 16-inch stringer centers, preserving 2.0 inches of clearance below the oil pan. Flexible elastomer mounts absorb vibration from the hull.

Service Schedules Application Constraints

Direct mechanical Morse cables connect helm control levers straight to governor and gearbox selectors for immediate response. Operators inspect raw water strainers, check oil levels, and monitor belt tension before getting underway. This engine package is not engineered for offshore planing hulls, commercial trawlers, or raw water cooled bilges without fresh water heat exchangers.

• Inspect sea water intake strainer before each shift.
• Inspect and clean heat exchanger zincs every 150 hours.
• Change engine lube oil, gear oil, and filters every 200 hours.

Warranty Terms Package Manifest

Recreational buyers receive 2-Year limited warranty protection on base castings and mechanical components. The shipping crate contains the engine package, KM2P-1 gearbox, vibration isolators, digital B20 instrument panel, five-meter extension wiring harness, oil extraction pump, and bound factory technical service manual.