The latest in a series of new-generation compact diesels from Yanmar Marine is its three-cylinder 3YM20, developing 21HP (15.3kW) at 3,600 rpm. Displacement is 0.854 litres. The naturally aspirated 3YM20 features a completely redesigned cylinder block and combustion system, configured for quietest possible, vibration-free running. It is a vertical four-stroke, fresh water cooled. With indirect injection and a swirl pre-combustion chamber, this all-new unit complies with EPA Tier 2 and BSO/SAV Stage 2 emissions regulations. A compact control panel, injection pump, electric stop solenoid and 60-amp alternator are introduced as standard. To meet heavier electrical demands, an 80-amp alternator is offered as an option. Maintenance has been simplified, with the water pump, fuel filter, oil change and dip stick located on the same side of the engine, at the front. This engine is available as a standard inboard, or with Yanmar’s double-seal saildrive unit. The inboard has a servo-cone clutch with a choice of 2.21:1, 2.62:1 and 3.22:1 forward ratios, plus 3.06:1 in reverse. The saildrive version, designated 3YM20C, has a constant mesh dog clutch, geared at 2.64:1 forward and reverse. In recent months, Yanmar Marine has introduced new diesels for sailboats and smaller motor boats at 29HP (21.3kW), 39HP (28.7kW) and 54HP (39.6kW). The 3YM20 at 21HP replaces Yanmar’s 2GM20 and provides around 17% more power

Specifications

• Rated Output : 15.3 kW / 21 mhp
• Rated Speed : 3600 rpm
• Displacement : 0.854 L / 52.1 cu. in
• No. of cylinders : 3 cylinders
• Cylinder Bore x Stroke : 70 mm x 74 mm / 2.76 in x 2.91 in
• Combustion system : Indirect Injection, In-line Pump
• Aspiration : Natural
• Alternator : 12V - 125A
• Dry weight without gear : 110 kg / 243 lbs
• Dimensions : 694 mm x 463 mm x 600 m
• Controls : Mechanical
• Certifications : RCD 2 EPA Tier 3 EPA Tier 3C BSO II EMC

NOTE:

1 kW = 1.3596 mhp = 1.34102 bhp
Fuel condition: density at 15°C = 0.842 g/cm³
Technical data is according to (ISO 8665) / (ISO 3046)
Fuel temperature 40°C at the inlet of the fuel injection pump (ISO 8665)
Length includes KM2P-1 marine gear & height includes U-type elbow
(Dimensions may vary with other gears/elbow)

Standard Engine Package

• Exhaust mixing elbow [L-type]
• Alternator 12V – 125A
• B20 panel
• Flexible mounts
• Expansion tank for fresh water cooling system
• Electric stop solenoid
• Belt safety cover

Optional Accessories

• High-riser mixing elbow [instead of L-elbow]
• Extension wire harness [4m, 6m]
• Dual harness [for 2nd station]
• TFX Sidemount control head
• Hot water kit with cocks
• Extension saildrive leg [50 mm]
• Propeller cone nut kit SD25
• On-board spare parts kit