Volvo Penta D2-50 MS25L Marine Diesel Engine: Integrated 50hp Power
The Complete Saildrive Solution for Performance and Shallow-Water Access
Introduction
The Volvo Penta D2-50 MS25L marine diesel engine represents a pinnacle of integrated marine propulsion, combining a robust 50 horsepower diesel engine with the innovative MS25L sail drive unit. At Wave Inboard Motors, our factory-trained technicians have deep, hands-on experience with Volvo Penta’s D2 series and saildrive systems, making us experts in the installation and maintenance of this sophisticated package. This 50hp marine diesel engine and drive system is engineered for sailors who demand clean, efficient power and the unmatched handling benefits of a saildrive.
Designed as a complete Volvo Penta saildrive solution for performance cruisers and yachts from 38 to 45 feet, the D2-50 MS25L offers a compelling package. The sail drive configuration allows for a more efficient propeller angle, reduces cabin noise and vibration, and enables shallower draft. The engine’s modern electronic management ensures optimal fuel efficiency and smooth operation across all RPM ranges. For owners seeking a modern, integrated propulsion system for a yacht repower, the Volvo Penta D2-50 for sale is a top-tier, feature-rich option.
This page provides a detailed look at its complete specifications, an honest comparison against its key rivals, and a clear breakdown of what makes this integrated system unique.
Technical Specifications Table
| Specification | Detail |
|---|---|
| Model | Volvo Penta D2-50 MS25L (Engine & Saildrive) |
| Engine Type | 4-Cylinder, 4-stroke, water-cooled diesel |
| Displacement | 2.2 L (2200 cc) |
| Max Output | 50 HP (37 kW) @ 2800 RPM |
| Bore x Stroke | 84 mm x 90 mm |
| Compression Ratio | 18.0:1 |
| Cooling System | Heat Exchanger (Closed-Cooling) |
| Starting System | 12V Electric Start |
| Alternator Output | 12V – 115A (as standard) |
| Dry Weight | 280 kg (617 lbs) (Engine & Drive) |
| Saildrive Unit | MS25L (2.15:1 Reduction) |
| Propeller | Designed for Volvo Penta Folding/Feathering Props |
Competitor Comparison Table
| Feature | Volvo Penta D2-50 MS25L | Yanmar 4JH45 w/ SD60 Saildrive | Beta Marine 50 w/ Conventional Transmission |
|---|---|---|---|
| System Type | Integrated Engine & Saildrive | Integrated Engine & Saildrive | Engine with Traditional Shaft Drive |
| Power (HP) | 50 HP @ 2800 RPM | 45 HP @ 3000 RPM | 50 HP @ 2800 RPM |
| Key Strength | Fully Integrated System, High Output Alt | Yanmar Brand Reputation & Reliability | Industrial Kubota Base, Shaft Drive Simplicity |
| Weight | 617 lbs (280 kg) | ~600 lbs (272 kg) | ~450 lbs (204 kg) (Engine only) |
| Installation | Clean, Integrated, Space-Saving | Clean, Integrated, Space-Saving | Requires separate dripless seal, coupling, alignment |
| Noise/Vibration | Very Low (Isolated drive unit) | Very Low | Low (Depends on installation) |
| Draft | Reduced (Propeller closer to hull) | Reduced | Determined by shaft angle |
Verdict: The Volvo Penta D2-50 MS25L wins as a complete, optimized system with outstanding standard features like a high-output alternator. It directly competes with the Yanmar saildrive package, offering slightly more horsepower. The choice between a saildrive and a traditional shaft drive (like the Beta) is significant: saildrives offer superior integration and handling, while shaft drives are known for ultimate simplicity and durability in grounding situations. The Volvo package is a top choice for a modern, performance-oriented installation.
Replacement Options Table
| Consideration | Rebuild Older Engine/Drive | Install Remanufactured D2-50/MS25L | Install Brand New System |
|---|---|---|---|
| Condition | Outdated technology, worn leg seals | Like-new, zero hours, all new seals and components | Perfect, factory-fresh with full warranty |
| Warranty | None | Full 1-Year Parts & Labor Warranty | Full Volvo Penta Factory Warranty |
| Performance | Original, declining | Restored to full 50HP, like-new efficiency | Optimal |
| Risk | High (Potential for leg seal failure) | Low (All new critical seals installed) | None |
| Total Project Value | Lowest (Investing in old tech) | High (Best value for a complete system) | Highest (Peak performance & warranty) |
Expert Recommendation: For a boat equipped with a saildrive, a professionally remanufactured Volvo Penta D2-50 MS25L package offers exceptional value and security. Replacing the entire integrated system ensures perfect compatibility and eliminates the risk of mating a new engine to an old, potentially worn-out sail drive leg. Crucially, the remanufacturing process includes replacing all critical leg seals, which is a primary failure point and a costly repair if done separately. This approach provides a turn-key solution with a warranty on the entire propulsion system.
Pros and Cons Table
| Pros | Cons |
|---|---|
| Fully Integrated, Optimized System | Saildrive leg requires haulout for service/repair |
| Excellent Standard High-Output Alternator | Vulnerable to damage from grounding (vs. shaft) |
| Reduced Noise & Vibration | Higher overall system cost than shaft drive |
| Superior Maneuverability & Efficiency | Volvo-specific parts and proprietary diagnostics |
| Space-Saving Installation | |
| Shallow Draft Capability |
Link to Our Core Service Pages:
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“Ensure a flawless integration with our certified 【Volvo Penta Saildrive Installation Services】.”
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“Protect your investment with our specialized 【Saildrive Maintenance & Seal Replacement】 service.”
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“Our experts can manage your entire 【Yacht Repower Project】 from old engine removal to new system calibration.”
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“We source and supply genuine 【Volvo Penta Saildrive Parts】 and seals.”
Link to Informational Blog Posts:
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“Understand the key differences in 【Saildrive vs. Shaft Drive: A Complete Guide】.”
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“Is it the right time? Learn the 【5 Signs You Need a Marine Engine Repower】.”
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“Planning your project? We break down the 【Costs of Repowering a Sailboat】.”
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“We explain the critical factors in 【Choosing the Right HP for Your Sailboat Repower】.”
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