Westerbeke marine diesel engines represent over 70 years of industry-leading experience in auxiliary marine propulsion. Exclusively designed for demanding marine applications, the current production lineup is built around compactness, quietness, and reliability — used by leading sailboat builders worldwide.
Current Production Models
12D Two
12 HP marine diesel
Westerbeke's most compact marine diesel — two-cylinder, four-cycle smoothness in a lightweight package built for small-sailboat auxiliary duty.
Naturally aspirated with fresh-water cooling, self-bleeding fuel system, and glow-plug cold starting. Four-point adjustable flex mounts and oil-pressure / water-temperature alarms come standard.
| Continuous Output | 12 HP |
| Cylinders | 2 |
| Displacement | 38.75 cu. in. (0.635 L) |
| Bore × Stroke | 2.99" × 2.76" |
| Aspiration | Natural |
| Cooling | Fresh water |
| Std. Transmission | Mechanical marine gear, 2.05:1 reduction |
| Dimensions (L × W × H) | 24.50" × 20.00" × 20.30" |
| Dry Weight | 225 lbs |
| Manufacturer Page | View on westerbeke.com |
30C Three
25 HP marine diesel
A three-cylinder evolution of the 12D platform, designed for the same four-cycle smoothness in a power-to-weight ratio that fits modest engine-room footprints.
Self-bleeding diesel system, gear-driven raw water pump, dedicated lube-oil cooler, and the same alarm package as the rest of the range.
| Continuous Output | 25 HP |
| Cylinders | 3 |
| Displacement | 58.09 cu. in. (0.95 L) |
| Bore × Stroke | 2.99" × 2.76" |
| Aspiration | Natural |
| Cooling | Fresh water |
| Std. Transmission | Short-profile marine gear, 2.47:1 reduction |
| Mounting Centers | 14.56" |
| Dimensions (L × W × H) | 29.30" × 20.00" × 20.40" |
| Dry Weight | 274 lbs |
| Manufacturer Page | View on westerbeke.com |
35E Three
28 HP marine diesel
A larger-displacement three-cylinder option with a 12V 50-amp alternator standard (72-amp optional). The Captain and Admiral instrumentation panels are also offered.
Designed by Westerbeke — pioneers in lightweight marine diesel — for sailing auxiliaries needing a bit more power without giving up footprint efficiency.
| Continuous Output | 28 HP |
| Cylinders | 3 |
| Displacement | 80.43 cu. in. (1.317 L) |
| Bore × Stroke | 3.07" × 3.62" |
| Aspiration | Natural |
| Cooling | Fresh water |
| Std. Transmission | Short-profile marine gear, 2:1 reduction |
| Alternator | 12V 50A standard (72A optional) |
| Dimensions (L × W × H) | 30.60" × 21.30" × 22.60" |
| Dry Weight | 386 lbs |
| Manufacturer Page | View on westerbeke.com |
44C Four
38 HP marine diesel
The top of the current production range — a four-cylinder lightweight diesel with a tuned air-intake silencer for noise reduction.
Same compact-and-quiet design language as the rest of the lineup, scaled for larger auxiliaries needing the extra cylinder.
| Continuous Output | 38 HP |
| Cylinders | 4 |
| Displacement | 107.27 cu. in. (1.76 L) |
| Bore × Stroke | 3.07" × 3.62" |
| Aspiration | Natural |
| Cooling | Fresh water |
| Std. Transmission | Short-profile marine gear, 2:1 reduction |
| Alternator | 12V 50A standard |
| Dimensions (L × W × H) | 34.10" × 21.30" × 23.00" |
| Dry Weight | 416 lbs |
| Manufacturer Page | View on westerbeke.com |
Standard Across the Range
- Self-bleeding diesel fuel system
- Fresh-water cooling with coolant recovery
- Glow-plug cold-starting aid
- Four-point adjustable flex mounts
- Low oil-pressure and high water-temperature alarms
- 12-volt alternator (50A standard on most models)
- Other transmission ratios available through your local distributor