Yanmar 2GM20F Marine Inboard Diesel Engine 18hp Freshwater Cooled
$7,688.00
- Description
Description
Yanmar 2GM20F Marine Inboard Diesel Engine 18HP Freshwater Cooled
The Yanmar 2GM20F marine inboard diesel engine combines a two-cylinder, 0.636-litre diesel platform with freshwater cooling through a heat exchanger. This 18HP-class GM Series engine is an option to assess for sailboat auxiliary propulsion and replacement projects where its output and installation requirements suit the vessel. nhmr.nl
Searching for a Yanmar 2GM20F engine for sale? Contact MSS Motorsports UG for current availability, details of the offered engine and an itemised quotation. Provide your existing engine designation and transmission information to establish the required package.
Freshwater Cooling for Your Marine Installation
The Yanmar 2GM20F circulates engine coolant through the cylinder block and cylinder head. A separate seawater circuit removes heat through the heat exchanger before discharging through the exhaust mixing elbow.
This arrangement keeps seawater separate from the engine’s internal coolant circuit during normal operation. The coolant pump, heat exchanger, seawater pump and associated hoses all remain part of the condition assessment. nhmr.nl
For an existing installation, confirm that the replacement includes the cooling components needed for your boat. Request available heat-exchanger service records and running-test evidence showing the operating temperature and cooling-water discharge.
Technical Specifications
| Specification | Manufacturer-Published Reference |
|---|---|
| Engine model | Yanmar 2GM20F |
| Engine configuration | Two-cylinder, vertical four-stroke diesel |
| Displacement | 0.636 litres / 636 cc |
| Bore × stroke | 75 × 72 mm |
| One-hour crankshaft output | 13.4 kW / 18.2 metric HP at 3,600 rpm |
| Continuous crankshaft output | 11.8 kW / 16.0 metric HP at 3,400 rpm |
| Combustion system | Swirl precombustion chamber / indirect injection |
| Cooling system | Freshwater cooling with heat exchanger |
| Lubrication | Enclosed, forced lubrication |
| Starting system | Electric, 12V / 1.0 kW |
| Alternator reference | 12V / 55A |
| Reference dry package weight | 114 kg, including marine gearbox |
These are original Yanmar reference specifications. Confirm the identification plate, fitted transmission, supplied equipment and any modifications for the particular unit. The quoted package weight includes the gearbox. nhmr.nl
Understand the 18HP Rating
The 18HP product label describes the engine’s higher output class. Yanmar’s cited documentation specifies 18.2 metric HP at 3,600 rpm for one-hour operation, with a separate 16.0 metric HP continuous rating at 3,400 rpm. Manualzz
Use the continuous rating when discussing sustained propulsion requirements with your installer. Vessel displacement, hull form, typical loading and propeller demand should be assessed alongside engine output.
Consult the Yanmar GM operation manual for original manufacturer operating information.
Gearbox and Sailboat Repower Requirements
Yanmar’s cited GM operation manual lists the KM2P mechanical cone-clutch gearbox for the 2GM20F. Establish the transmission actually fitted to the offered unit, including its reduction ratio and output coupling. Manualzz
For a replacement-engine enquiry, provide:
- Engine and gearbox identification: Model plates and serial numbers.
- Mounting measurements: Engine-bed dimensions, mount spacing and shaft height.
- Drivetrain details: Coupling dimensions, shaft arrangement and propeller information.
- Service connections: Exhaust, cooling-water, fuel and electrical arrangements.
- Control requirements: Throttle, shift, stop controls and instrument connections.
Compare the complete installation even when replacing another 2GM20F. Clear photographs and measurements help your installer identify additional components or alterations before purchase.
For a higher-output freshwater-cooled model in the same family, compare the Yanmar 3GM30F marine inboard diesel engine. Check its installation requirements separately.
Compare Condition, Equipment and Total Cost
When reviewing a Yanmar 2GM20F price, request a quotation that identifies the engine and supplied equipment clearly.
Confirm:
- Stated condition and documented operating hours, where available.
- Service history and the scope of any repairs or rebuilding.
- Available cold-start, warm-running and compression-test evidence.
- Cooling-system inspection findings and maintenance records.
- Gearbox, coupling, mounts, starter, alternator, panel and wiring supplied.
- Terms for any warranty offered, including provider, coverage and exclusions.
- Packing arrangements, estimated dispatch timing and delivery charges.
For a unit described as reconditioned, request the work record showing what was inspected, repaired or replaced and the tests performed afterward.
Compare the engine price together with transport, installation parts and commissioning. An itemised quotation makes the complete purchase easier to assess.
Frequently Asked Questions
Does freshwater cooled mean the engine operates without seawater?
The original system uses a separate seawater circuit to cool the engine coolant through a heat exchanger. The seawater pump and associated connections remain essential. nhmr.nl
Is 18HP the continuous rating?
No. Yanmar’s cited documentation separates the one-hour and continuous outputs. Use the continuous rating shown in the specifications for sustained-operation discussions.
Are the gearbox and manufacturer warranty included?
Package contents and warranty depend on the offered engine and supply arrangement. Request an itemised equipment list and written warranty terms.
Request Your Yanmar 2GM20F Quote
Contact MSS Motorsports UG for a Yanmar 2GM20F quotation with your vessel make and model, current engine designation, gearbox model and ratio, intended use and purchase timing. Include your billing and delivery addresses to request equipment pricing and transport costs for your destination.
