The M104 Engine: Overview, Specifications, and FAQs
m104 engine for sale, The Mercedes-Benz M104 engine is a classic inline-6 engine series celebrated for its robust performance and engineering excellence. Produced from 1989 to 1999, it powered various Mercedes-Benz models, delivering reliability, power, and smoothness.
Whether you’re a car enthusiast seeking a replacement engine or a project car builder aiming to revive a classic Mercedes, the M104 remains a popular choice. Below, we’ll explore its features, technical specifications, and frequently asked questions.
Key Features of the M104 Engine
- Inline-6 Configuration
- The M104 engine is an inline-6 (I6) engine, known for its balance and smooth operation.
- Multi-Valve Technology
- Early models featured a 12-valve design, while later versions used a 24-valve DOHC setup for improved power and efficiency.
- Displacement Options
- Available in various displacements: 2.8L (M104.94x), 3.0L (M104.98x), and 3.2L (M104.99x).
- Advanced Fuel Injection
- Equipped with electronic fuel injection systems, such as KE-Jetronic and later HFM (Hot Film Airflow Meter) for better fuel economy and performance.
- Durable Construction
- Built with high-quality materials, including an aluminum head and cast-iron block, ensuring longevity.
M104 Engine Specifications
| Specification | Details |
|---|---|
| Engine Type | Inline-6, water-cooled |
| Displacement Options | 2.8L, 3.0L, 3.2L |
| Valvetrain | DOHC, 4 valves per cylinder |
| Compression Ratio | 9.2:1 to 10.5:1 (varies by model) |
| Fuel System | KE-Jetronic or HFM |
| Power Output | 197–231 hp (depending on variant) |
| Torque Output | 270–315 Nm (varies by model) |
| Bore x Stroke | 89.9 x 84 mm (M104.99x, 3.2L) |
| Fuel Type | Petrol |
| Production Years | 1989–1999 |
Models Featuring the M104 Engine
The M104 engine was utilized in several iconic Mercedes-Benz models, including:
- W124 E-Class (1989–1995)
- M104.98x (3.0L) and M104.99x (3.2L).
- W140 S-Class (1991–1998)
- Featured in the S280 and S320 models.
- R129 SL-Class (1989–1998)
- Powered the SL280, SL300, and SL320 models.
- W202 C-Class (1993–2000)
- Available in the C280 variant.
- W210 E-Class (1995–1999)
- Used in early E320 models.
Where to Buy M104 Engines for Sale
1. Online Marketplaces
- Platforms like eBay, Craigslist, and Facebook Marketplace often list used M104 engines. Verify the seller’s reputation before purchasing.
2. Specialized Auto Parts Stores
- Mercedes-Benz specialist stores or workshops can supply reconditioned or new-old-stock (NOS) M104 engines.
3. Salvage Yards
- Wrecking yards with Mercedes models may have engines in salvageable condition.
4. Forums and Communities
- Online communities like BenzWorld and MBWorld often feature members selling engines and parts.
FAQs About the m104 engine for sale
1. How reliable is the M104 engine?
The M104 engine is highly reliable when maintained properly. Regular oil changes, proper coolant levels, and timely replacement of wear-and-tear components ensure longevity.
2. What are common issues with the M104 engine?
- Head Gasket Failure: Early models had a tendency for head gasket leaks. Modern replacements are more robust.
- Oil Leaks: Common around the timing cover or valve cover gasket.
- Wiring Harness Deterioration: Biodegradable wiring used in some models can fail over time.
3. Can the M104 engine be tuned for more performance?
Yes, the M104 can be tuned. Options include performance camshafts, ECU remapping, or adding forced induction like a turbocharger or supercharger.
4. What is the cost of an M104 engine?
Prices vary depending on the condition:
- Used: $1,000–$3,000
- Rebuilt: $3,500–$5,000
- New (NOS): $5,000–$8,000+
5. Can I swap an M104 engine into another car?
Yes, the M104 is a popular swap choice for project cars, but you’ll need custom mounts, wiring, and tuning expertise.
6. What fuel grade is recommended for the M104?
Premium unleaded gasoline (91–95 octane) is recommended for optimal performance and efficiency.
7. Are spare parts for the M104 engine still available?
Yes, parts are available from Mercedes-Benz dealerships, aftermarket suppliers, and online marketplaces.
Conclusion | m104 engine for sale
The M104 engine remains a testament to Mercedes-Benz’s engineering prowess. Whether you’re looking to restore a classic car or seek a robust engine for a custom build, the M104 offers reliability, performance, and adaptability.
When purchasing an M104 engine, consider its condition, source, and compatibility with your project. With proper care, this inline-6 powerhouse can provide years of dependable service.
