Yanmar 2GM20 Marine Inboard Diesel Engine 18hp
$7,538.00
- Description
Description
Yanmar 2GM20 Marine Inboard Diesel Engine 18HP
The Yanmar 2GM20 marine inboard diesel engine is a two-cylinder, 0.636-litre diesel with direct seawater cooling and a swirl precombustion-chamber combustion system. This 18HP-class GM Series engine is an option to assess for sailboat auxiliary propulsion and small-boat replacement projects. nhmr.nl
Looking for a Yanmar 2GM20 engine for sale? Contact MSS Motorsports UG for current availability, details of the offered unit and an itemised quotation. Share your existing engine designation and gearbox information so the enquiry reflects your vessel’s installation.
Direct Seawater Cooling and Engine Condition
The standard Yanmar 2GM20 circulates seawater through its cooling passages using a rubber-impeller pump. Yanmar’s workshop documentation describes a thermostat, bypass circuit and anticorrosion zincs within the seawater-cooling arrangement. nhmr.nl
For a replacement-engine purchase, request available records covering the cooling passages, pump, thermostat, hoses and exhaust components. Ask for running-test evidence showing cooling-water discharge and the stated test conditions.
For the heat-exchanger-cooled version, compare the Yanmar 2GM20F freshwater-cooled marine diesel engine. Confirm the complete model designation and actual cooling arrangement, especially if the engine has been modified.
Technical Specifications
| Specification | Manufacturer-Published Reference |
|---|---|
| Engine model | Yanmar 2GM20 |
| 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 |
| Original cooling system | Direct seawater cooling with rubber-impeller pump |
| Lubrication | Enclosed, forced lubrication |
| Starting arrangement | Electric and manual in the reference specification |
| Starter specification | 12V / 1.0 kW |
| Alternator reference | 12V / 55A |
| Reference dry package weight | 106 kg, including marine gearbox |
These figures follow the cited Yanmar GM operation manual. Verify the identification plate, transmission and installed equipment for the particular unit. The reference weight includes the gearbox. Manualzz
Understand the 18HP Rating
The 18HP product label describes the higher output class. Yanmar’s cited documentation lists 18.2 metric HP at 3,600 rpm for one-hour operation and 16.0 metric HP at 3,400 rpm continuously. Manualzz
Discuss the continuous rating and intended operating profile with your installer. Hull form, vessel displacement, typical loading and propeller demand should be considered alongside engine output.
Review the Yanmar GM operation manual for original manufacturer operating information.
Gearbox and Shaft-Drive Installation
The cited GM operation manual lists a KM2P mechanical cone-clutch gearbox for the 2GM20. Confirm the transmission actually fitted to the offered engine, including its reduction ratio and coupling. Manualzz
Before ordering, compare:
- Engine mounts: Bed dimensions, mounting positions and shaft height.
- Propulsion equipment: Gearbox ratio, output coupling, propeller shaft and alignment.
- Controls: Throttle, shift, stop controls and instrument connections.
- Service connections: Seawater intake, exhaust routing, fuel lines and electrical wiring.
- Maintenance access: Clearance around filters, belts and the cooling-water pump.
The reference specification includes electric and manual starting. Ask whether the offered unit retains the manual-start components and which starting equipment is supplied.
Photographs of the existing engine, gearbox plates and installation space help your installer assess the proposed replacement.
Compare the Complete Yanmar 2GM20 Package
A useful Yanmar 2GM20 price comparison accounts for engine condition, included equipment and the work needed before installation.
Request a written quotation confirming:
- Engine identification, stated condition and documented 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, instruments and wiring supplied.
- Terms for any warranty offered, including provider, coverage and exclusions.
- Packing arrangements, estimated dispatch timing and delivery charges.
If an engine is described as reconditioned, ask what was inspected, repaired or replaced and which tests followed. Unit-specific records provide a clearer basis for comparison than the condition label alone.
Include transport, installation parts and commissioning when assessing the complete project cost.
Frequently Asked Questions
Is the standard Yanmar 2GM20 freshwater cooled?
Its original specification uses direct seawater cooling. The 2GM20F is the freshwater heat-exchanger-cooled version. Verify any modifications to the offered engine. nhmr.nl
Is 18HP the continuous rating?
No. The original documentation separates the one-hour and continuous ratings. Use the continuous output in the specifications when discussing sustained propulsion requirements.
Does the engine include a gearbox and manufacturer warranty?
Package contents and warranty depend on the offered unit and supply arrangement. Request an itemised equipment list and written warranty terms.
Request Your Yanmar 2GM20 Quote
Contact MSS Motorsports UG for a Yanmar 2GM20 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.
