The Ultimate Guide to the Mercedes M273 Engine: Specs, Problems, and Reliability
The Mercedes-Benz M273 engine family represents a significant leap in engineering for the German automaker, combining performance, luxury, and reliability. Introduced in 2005, the M273 was designed to replace the M113 engine and has since become a popular choice in various Mercedes models. This guide will delve into the specifications, common issues, and reliability of the M273 engine, providing you with everything you need to know.
Comparison of Mercedes M273 Engine Variants
| Engine Variant | Displacement | Power Output | Torque | Applications |
|---|---|---|---|---|
| M273 46 KE | 4.7L | 335 hp | 339 lb-ft | E-Class, S-Class, ML-Class |
| M273 55 KE | 5.5L | 382 hp | 391 lb-ft | S-Class, CL-Class, G-Class |
| M273 62 KE | 6.2L (AMG) | 507 hp | 465 lb-ft | AMG models, high-performance vehicles |
Overview of the M273 Engine Family
The Mercedes-Benz M273 engine series includes both the 4.7-liter and 5.5-liter V8 configurations. These engines were built on the foundation of the M272 V6 and feature an all-aluminum construction, which greatly reduces weight while enhancing performance. The M273 engines are characterized by a 90-degree V-shape, equipped with advanced technologies such as variable valve timing and multi-port fuel injection.
The M273 was engineered to deliver strong, linear performance while maintaining the luxurious driving experience expected from Mercedes vehicles. With applications in prominent models like the S-Class and E-Class, the M273 has carved out a reputation for both power and refinement.
Key Specifications of the M273 Engine
Engine Design and Architecture
The M273 engines are designed with a focus on durability and efficiency. Key design features include:
– Material: All-aluminum construction, including the crankcase and cylinder heads.
– Cylinder Liners: Al-Si alloy cast liners for improved wear resistance.
– Valvetrain: Double overhead camshafts (DOHC) with four valves per cylinder.
– Fuel Injection: Sequential fuel injection controlled by the Bosch ME9 ECU.
Performance Metrics
The M273 engines deliver impressive performance metrics:
– M273 46 KE: Offers 335 horsepower and 339 lb-ft of torque, making it suitable for daily driving and luxury applications.
– M273 55 KE: Produces 382 horsepower and 391 lb-ft of torque, ideal for high-performance vehicles.
– M273 62 KE: In AMG variants, it peaks at 507 horsepower and 465 lb-ft of torque, catering to enthusiasts seeking thrilling performance.
Cooling and Temperature Management
The M273 engine utilizes an electronically controlled thermostat for optimal temperature management. This system enhances engine efficiency and extends the lifespan of engine components by maintaining an ideal operating temperature.
Common Problems Associated with the M273 Engine
While the M273 engines are generally reliable, owners have reported several common issues that may arise over time:
Intake Manifold Failures
One of the most frequently reported problems is the failure of the intake manifold, particularly in older models. This can lead to a loss of performance and increased fuel consumption. Regular inspections and timely replacements can mitigate this issue.
Camshaft Adjuster Wear
Wear on the camshaft adjusters can lead to a rough idle and decreased performance. This is often attributed to poor maintenance or low oil levels. Regular oil changes and using high-quality engine oil can help prevent this issue.
Oil Leaks
Oil leaks are another common problem with the M273 engines. These can stem from various seals and gaskets, particularly around the valve covers and oil pan. Addressing leaks promptly is crucial to maintaining engine health.
Maintenance Tips for the M273 Engine
To keep your M273 engine running smoothly, consider the following maintenance tips:
Regular Oil Changes
Changing the engine oil regularly using the recommended oil type is essential for maintaining engine health. This ensures proper lubrication and can help prevent premature wear of engine components.
Monitoring Engine Temperature
Keep an eye on the engine temperature gauge. Overheating can lead to severe damage, so if you notice any fluctuations, have your cooling system inspected immediately.
Routine Inspections
Conduct regular inspections of the intake manifold and camshaft adjusters. Early detection of wear can save you from costly repairs down the line.
Technical Features Comparison of the M273 Engine
| Feature | M273 46 KE | M273 55 KE | M273 62 KE (AMG) |
|---|---|---|---|
| Displacement | 4.7L | 5.5L | 6.2L |
| Horsepower | 335 hp | 382 hp | 507 hp |
| Torque | 339 lb-ft | 391 lb-ft | 465 lb-ft |
| Cylinder Configuration | V8 | V8 | V8 |
| Fuel System | Multi-port Injection | Multi-port Injection | Multi-port Injection |
| Variable Valve Timing | Yes | Yes | Yes |
| Cooling System | Electronically controlled | Electronically controlled | Electronically controlled |
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Conclusion
The Mercedes M273 engine family represents a significant achievement in automotive engineering, blending power, luxury, and reliability. While common issues such as intake manifold failures and camshaft adjuster wear may arise, regular maintenance can extend the engine’s life. Whether in a luxury sedan or a high-performance AMG model, the M273 continues to impress.
FAQ
What is the Mercedes M273 engine?
The Mercedes M273 is a naturally aspirated V8 engine introduced in 2005, designed to replace the M113 engine, offering improved performance and technology.
What vehicles use the M273 engine?
The M273 engine powers a variety of Mercedes models, including the S-Class, E-Class, G-Class, and ML-Class.
What are the common problems with the M273 engine?
Common problems include intake manifold failures, camshaft adjuster wear, and oil leaks.
How often should I change the oil in my M273 engine?
It’s recommended to change the oil every 7,500 to 10,000 miles, depending on driving conditions and oil type.
Is the M273 engine reliable?
Overall, the M273 engine is considered reliable, but regular maintenance is crucial to prevent common issues.
What type of oil should I use for the M273 engine?
Refer to your vehicle’s service manual for specific oil recommendations, but high-quality synthetic oil is generally recommended.
Can I use parts from the M272 engine on the M273?
No, the crankshafts, pistons, and rods of both versions are not interchangeable due to design differences.
What should I do if my M273 engine is overheating?
If your engine is overheating, check the cooling system, including the coolant level and radiator function. Seek professional assistance if needed.
How does the M273 compare to the newer M278 engine?
The M278 is a twin-turbocharged engine that offers improved fuel efficiency and power compared to the naturally aspirated M273.
What is the lifespan of the M273 engine?
With proper maintenance, the M273 engine can last well over 200,000 miles, making it a durable choice for luxury vehicles.