The Mercedes — Benz M110.926 is a 2,778 cc, inline — six petrol engine produced between 1973 and 1985. It belongs to the M110 series, engineered for refined performance and durability in executive sedans and coupes. Featuring a dual overhead camshaft (DOHC), four — valves — per — cylinder design, and K — Jetronic mechanical fuel injection, it delivered 130 kW (177 PS) and 245 Nm of torque, offering strong high — revving performance and precise valve control.
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Pre-1979 models meet pre-Euro standards; 1979–1985 variants comply with Euro 1 depending on market (VCA UK Type Approval #VCA/EMS/5684).
The Mercedes-Benz M110.926 is a 2,778 cc inline-six petrol engine engineered for performance-oriented sedans and coupes (1973–1985). It combines DOHC valvetrain architecture with Bosch K-Jetronic continuous fuel injection to deliver high-revving performance and long-term reliability. Designed to meet pre-Euro and Euro 1 emissions standards, it balances mechanical sophistication with driving refinement.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,778 cc | |
Fuel type | Petrol | |
Configuration | Inline-6, DOHC, 24-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 87.0 mm × 78.0 mm | |
Power output | 130 kW (177 PS) @ 6,000 rpm | |
Torque | 245 Nm @ 4,000 rpm | |
Fuel system | Bosch K-Jetronic (mechanical continuous injection) | |
Emissions standard | Pre-Euro (pre-1979); Euro 1 (1979–1985) | |
Compression ratio | 9.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | N/A | |
Timing system | Double-row timing chain (interference design) | |
Oil type | SAE 20W-50 (MB 228.1 specification) | |
Dry weight | 193 kg |
The Mercedes-Benz M110.926 was used across Mercedes-Benz's W114/W115 platforms with longitudinal mounting and no licensing partnerships. This engine received platform-specific adaptations-longer intake runners in the W115 and revised exhaust manifolds in the C123-and from 1979 the facelifted W114 adopted updated emissions controls, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M110.926's primary reliability risk is camshaft wear on early builds, with elevated incidence in high-mileage or poorly maintained vehicles. Internal Mercedes quality reports from 1975 indicated a significant number of pre-1976 engines showing lobe pitting before 120,000 km, while UK DVSA MOT records show valve train noise as a common failure point in classic vehicle inspections. Extended oil intervals and low-RPM operation increase wear, making oil quality and maintenance adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (1973-1985) and UK DVSA failure statistics (1970-2023). Repair procedures should follow manufacturer guidelines.
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The M110.926 is generally robust and durable, but early models (1973-1976) are prone to camshaft wear if maintenance is neglected. Later revisions (post-1976) feature improved ignition modules and cam profiles, enhancing longevity. Regular oil changes with correct specification (20W-50 MB 228.1) and inspection of fuel and vacuum systems ensure reliable operation over 150,000 km.
Key issues include camshaft lobe wear (especially pre-1976), K-Jetronic fuel distributor faults, vacuum leaks from intake boots, and oil seepage from valve cover gaskets. These are well-documented in Mercedes technical bulletins. Fuel system cleanliness and consistent lubrication are critical to preventing major failures.
This 2.8L inline-six was used in several performance models: W114 C-Class (280), W115 C-Class (280C), and C123 SEC (280CE). Production spanned 1973 to 1985, with pre-1979 units meeting pre-Euro and later models Euro 1 compliance. It was not licensed to other manufacturers.
Limited tuning potential exists due to its naturally aspirated DOHC design. Performance gains are modest and typically involve exhaust upgrades, intake modifications, and fuel distributor recalibration. Some enthusiasts install M110.986 cylinder heads for better breathing. However, stock configuration prioritizes high-RPM smoothness over high output.
Moderate by classic car standards. In a W114 280, typical consumption is ~14.0 L/100km (city) and ~9.0 L/100km (highway), or about 20 mpg UK combined. Real-world figures depend on driving style and vehicle condition. Expect 18-22 mpg (UK) on mixed roads for a well-maintained example.
Yes. The M110 series is an interference engine. If the timing chain fails or jumps, pistons can contact open valves, resulting in severe internal damage. Chain inspection and tensioner function are critical, especially on high-mileage engines. Any unusual noise from the front of the engine should be investigated immediately.
Mercedes specifies SAE 20W-50 oil meeting MB 228.1 specification. Use a high-quality mineral oil designed for older petrol engines. Change intervals should not exceed 6,000 km or annually to ensure proper cam lobe lubrication and prevent wear in high-load areas.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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