Yanmar 3GM30 Marine Inboard Diesel Engine 27hp
$8,088.00
- Description
Description
Yanmar 3GM30 Marine Inboard Diesel Engine 27HP
The Yanmar 3GM30 marine inboard diesel engine is a three-cylinder, 0.954-litre diesel with direct seawater cooling and a swirl precombustion-chamber combustion system. For owners replacing an existing GM Series installation, this 27HP-class engine is an option to assess against the vessel’s propulsion and installation requirements. saltwaterdiesels.com
Looking for a Yanmar 3GM30 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 covers the equipment required for your boat.
Direct Seawater Cooling: Confirm the Correct Engine Version
The standard 3GM30 uses a rubber-impeller pump to circulate seawater through its cooling passages. Yanmar’s workshop manual describes a thermostat and bypass arrangement to regulate cooling-water flow, together with anticorrosion zincs. nhmr.nl
When assessing an engine, request information about the cooling passages, pump condition, thermostat, hoses, exhaust manifold and mixing elbow. Ask for available service records and running-test evidence showing cooling-water discharge under the stated test conditions.
For the heat-exchanger-cooled version, compare the Yanmar 3GM30F freshwater-cooled marine diesel engine. Confirm the complete model designation and actual cooling arrangement before choosing a replacement.
Technical Specifications
| Specification | Manufacturer-Published Reference |
|---|---|
| Engine model | Yanmar 3GM30 |
| Engine configuration | Three-cylinder, vertical four-stroke diesel |
| Displacement | 0.954 litres / 954 cc |
| Bore × stroke | 75 × 72 mm |
| One-hour crankshaft output | 20.1 kW / 27.3 metric HP at 3,600 rpm |
| Continuous crankshaft output | 17.7 kW / 24.1 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 |
These are reference specifications from Yanmar’s original documentation. Verify the identification plate, equipment and any modifications for the particular engine offered. saltwaterdiesels.com
Understand the 27HP Product Rating
The 27HP listing label corresponds to the engine’s higher one-hour output class. The cited Yanmar documentation expresses this as 27.3 metric HP at 3,600 rpm, with a separate continuous rating of 24.1 metric HP at 3,400 rpm. Manualzz
Discuss the intended cruising load and operating profile with your installer. The vessel’s displacement, hull form, gearbox ratio and propeller demand all influence the engine selection.
Consult the Yanmar GM operation manual for original manufacturer operating information.
Marine Gearbox and Shaft-Drive Installation
The cited GM operation manual documents KM-series mechanical cone-clutch transmissions for the Yanmar 3GM30. Gearbox model and reduction ratio should be established from the offered unit’s identification plate. Manualzz
Before ordering a replacement engine, check:
- Mounting arrangement: Engine-bed dimensions, mount positions and shaft height.
- Drivetrain: Gearbox ratio, output coupling, propeller shaft and alignment.
- Controls: Throttle, shift and stop connections.
- Connections: Exhaust routing, seawater intake, fuel lines and electrical wiring.
- Service access: Clearance for filters, belts, pump inspection and routine maintenance.
Provide photographs and measurements of the existing installation. Even when replacing another 3GM30, compare the actual engine and transmission configurations.
Compare the Complete Engine Package
A meaningful Yanmar 3GM30 price comparison includes condition, supplied equipment and the work needed for installation.
Request a written quotation confirming:
- Engine serial number, 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, instruments, wiring and exhaust components supplied.
- Warranty provider, coverage, exclusions and any commissioning requirements.
- Packing arrangements, estimated dispatch timing and delivery charges.
For a unit described as reconditioned, ask which components were inspected, repaired or replaced and what testing followed. Documented work helps you assess the offered engine beyond its external appearance.
For a sailboat repower, compare the total equipment and installation cost alongside the engine purchase price.
Frequently Asked Questions
Is the standard Yanmar 3GM30 freshwater cooled?
Its original specification uses direct seawater cooling. The Yanmar 3GM30 is the freshwater heat-exchanger-cooled version. Confirm any modifications to the offered engine. Manualzz
Is 27HP the continuous rating?
No. The original documentation separates the one-hour and continuous ratings. Use the continuous output shown in the specifications when discussing sustained propulsion requirements.
Does the engine include a gearbox and warranty?
Inclusions and warranty depend on the offered unit and supply arrangement. Request an itemised equipment list and written warranty terms.
Request Your Yanmar 3GM30 Quote
Contact MSS Motorsports UG for a Yanmar 3GM30 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.
