Yanmar 3YM20 21HP 4-Stroke Marine Diesel Engine Inboard

Yanmar 3YM20 21HP 4-Stroke Marine Diesel Engine Inboard

New Yanmar 3YM20 21HP 4-Stroke Marine Diesel Engine Inboard

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

Combustion System Indirect Injection
Cylinders In-line
Direction Of Rotation [Crankshaft] Counterclockwise Viewed From Stern
Lubrication System Enclosed, Forced Lubricating System
Starting System Electric Starting 12V - 1.4 kW
Configuration 4-Stroke, Vertical, Water-Cooled Diesel Engine
Maximum Output At Crankshaft * 15.3 kW@3600 rpm [21 mhp@3600 rpm]
Displacement 0.854 L [52.1 cu in]
Bore X Stroke 70 mm x 74 mm, [2.76 in x 2.91 in]
Aspiration Natural Aspiration
Cooling System Fresh Water Cooling With Heat Exchanger
Dry Weight Without Gear 110 kg [243 lbs]
Engine Mounting Rubber Type Flexible Mounting
Model KM2P-1 (Parallel), Saildrive [SD25]
• Alternator 12V - 125A OPTIONS:
• B20-Panel • Extension Wire Harness [4m, 6m, 10m]
• Belt Safety Cover • High-Riser Mixing Elbow [Instead Of L-elbow]
• Expansion Tank For Fresh Water Cooling System • Hot Water Kit With Cocks
• Set Of Flexible Mounts • Propeller Cone Nut Kit SD25
• Sensor For Instrument Panel • Dual Harness (For 2nd Station)
• Exhaust Mixing Elbow [L-type]
• Operation Manual
• Electric Stop Solenoid

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