Yanmar 3GM30F Specifications
| Engine Model: Yanmar 3GM30F |
| Engine Type: 4-stroke inline 3-cylinder water-cooled diesel |
| Total Displacement: 58.2 cu.in (0.95 L) |
| Rated Engine Power: 27 Hp (20.1 kW) at 3600 rpm |
| Fuel System Type: Indirect injection |
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The Yanmar 3GM30F is a freshwater-cooled (heat
exchanger) version of the 3-cylinder GM series marine diesel engine. It
is widely used in mid-sized sailboats for its compact design and high
reliability. The engine is available with two transmission options: the
KM3P/KM3A mechanical cone clutch and the SD20 saildrive unit.
The Yanmar 3GM30F is a vertical, 3-cylinder, 4-cycle, water-cooled
diesel engine featuring an indirect injection system with a swirl
pre-combustion chamber for smooth operation. Its freshwater cooling
system, utilizing a heat exchanger, protects the engine from the
corrosive effects of raw seawater. The engine is rated for 20.1 kW (27
hp) at 3600 rpm, with a continuous rating of 17.9 kW (24 hp) at 3400
rpm.
Known for its high reliability and compact design, this engine has
become a standard powerplant for sailboats up to approximately 35 feet.
The engine weighs 138 kg (304 lbs) including marine gear, making it
suitable for vessels where weight distribution is critical. The firing
order is 1-3-2-1. The compression pressure specification ranges from 28
to 33 kg/cm2.
Engine Family: Yanmar GM Series.
Configuration: Vertical in-line 3-cylinder, 4-stroke diesel.
Displacement: 0.954 L (954 cc).
Bore x Stroke: 75.0 mm x 72.0 mm (2.95 in x 2.83 in).
Compression Ratio: 23.5:1.
Firing Order: 1-3-2-1.
Aspiration: Naturally aspirated.
Fuel System: Indirect injection (swirl pre-combustion chamber).
Fuel Injection Timing: 18° BTDC.
Maximum Output: 20.1 kW (27 hp) at 3600 rpm.
Continuous Rating: 17.9 kW (24 hp) at 3400 rpm.
Maximum Torque: 60 Nm (44 lb-ft) at 2400 rpm.
Maximum Fuel Consumption: 215 g/hp-hr.
Cruising Fuel Consumption: 2.5-3.0 L/hour.
Material: Cast iron.
Configuration: Vertical in-line 3-cylinder.
Cylinder Liners: Parent bore (no replaceable liners).
Number of Cylinders: 3.
Bore Diameter: 75.0 mm (2.95 in).
Material: Cast iron.
Valvetrain: Overhead valve (OHV) with pushrods and rocker arms.
Valves per Cylinder: 2 (1 intake, 1 exhaust).
Total Valves: 6.
Valve Clearance (Cold - Intake and Exhaust): 0.20 mm (0.008 in).
Combustion System: Indirect injection with swirl pre-combustion chamber.
System Type: Indirect injection with mechanical injection pump.
Injection Pump: Inline mechanical pump.
Injectors: Mechanical nozzle-and-holder type.
Injection Timing: 18° BTDC.
Fuel Filter: Spin-on type with integral water separator.
Fuel Type: Diesel No. 1-D or No. 2-D.
System Type: Forced lubrication with trochoid pump.
Oil Capacity (engine only): 2.6-2.7 L (2.75-2.85 qt).
Oil Specification (API): Class CD, CF-4, or higher (mineral oil
recommended).
Oil Viscosity (SAE): 15W-40 or 10W-30.
Oil Change Interval: 100 hours or annually.
Oil Cooler: Seawater-cooled oil cooler integrated with heat exchanger.
Oil Pan: Stamped steel.
System Type: Freshwater cooling with heat exchanger (closed circuit).
Coolant Capacity (freshwater side): 5.5 L (1.5 gal).
Thermostat (Opening Temperature): 71-82°C (160-180°F).
Heat Exchanger: Tube-bundle type for seawater cooling of engine coolant.
Raw Water Pump: Impeller-type pump for seawater circulation.
Expansion Tank: Integral with heat exchanger.
Electrical System: 12 V.
Alternator: 12 V / 55 A.
Starter Motor: 12 V / 1.0 kW.
Glow Plugs: 3 units (12 V) for cold starting.
Overall Length: 740 mm (29.1 in)
Overall Width: 455 mm (17.9 in)
Overall Height: 545 mm (21.5 in)
Dry Weight (including marine gear): 138 kg (304 lbs).
Engine Oil Change Interval: 100 hours or annually.
Engine Oil Filter Change: Every oil change (100 hours).
Fuel Filter Change Interval: 200 hours or annually.
Raw Water Impeller Replacement: 200 hours or annually.
Coolant Change Interval: 1000 hours or 2 years.
Valve Clearance Inspection Interval: 500 hours.
Injection Timing Check: 1000 hours.
Compression Pressure Check: 1000 hours (standard: 28-33 kg/cm2).
Anode Inspection (heat exchanger): Every 100 hours or seasonally.
Cylinder Head Bolts: 118 Nm (87 lb-ft).
Connecting Rod Cap Nuts: 45 Nm (33 lb-ft).
Main Bearing Cap Bolts (M12): 70 Nm (52 lb-ft).
Flywheel to Crankshaft Bolts: 45 Nm (33 lb-ft).
Flywheel Housing to Block: 30 Nm (22 lb-ft).
Intake Manifold (M8): 15 Nm (11 lb-ft).
Exhaust Manifold (M10): 25 Nm (18 lb-ft).
Injector Hold-Down Clamp (M8): 20 Nm (15 lb-ft).
Glow Plug (M10): 18 Nm (13 lb-ft).
Oil Pan Drain Plug (M14): 35 Nm (26 lb-ft).
Thermostat Housing Bolts (M8): 10 Nm (7 lb-ft).
Valve Cover Bolts (M6): 7 Nm (5 lb-ft).
Sailboats: Mid-sized cruising sailboats (28-35 feet) requiring auxiliary
power.
Sailboats: Catalina 30, 320, 34; Beneteau 331, 343; Hunter 33, 34;
Pearson 31, 33.
Power Boats: Small displacement motor cruisers and fishing boats.
Transmission Option 1: Kanzaki KM3P or KM3A mechanical cone clutch with
reduction ratios of 2.36:1, 2.61:1, or 3.20:1.
Transmission Option 2: Yanmar SD20 saildrive with clutch dog and 2.64:1
reduction ratio.
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