The Mercedes — Benz M110.924 is a 2,746 cc, inline — six, naturally aspirated petrol engine produced between 1978 and 1985. It features a single overhead camshaft (SOHC) design with 12 valves and mechanical fuel injection (Bosch K — Jetronic), delivering smooth linear power delivery and high — RPM capability. This engine was engineered for durability and refined operation in executive sedans and coupes.
Fitted to models such as the W123 280E and W126 280SE, the M110.924 wa…
Production years 1978–1985 meet Euro 1 precursor standards (VCA UK Type Approval #VCA/EMS/5677).
The Mercedes-Benz M110.924 is a 2,746 cc inline-six naturally aspirated engine engineered for executive sedans and coupes (1978–1985). It combines SOHC 12-valve architecture with Bosch K-Jetronic mechanical fuel injection to deliver refined high-RPM performance and smooth power delivery. Designed to meet early European emissions standards, it balances driving comfort with mechanical robustness.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,746 cc | |
Fuel type | Petrol | |
Configuration | Inline-6, SOHC, 12-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 87.0 mm × 76.5 mm | |
Power output | 127 kW (173 PS) @ 5,800 rpm | |
Torque | 240 Nm @ 4,000 rpm | |
Fuel system | Bosch K-Jetronic mechanical fuel injection | |
Emissions standard | Euro 1 precursor | |
Compression ratio | 9.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Single-row roller chain (single-stage) | |
Oil type | SAE 10W-40 (MB 229.0) | |
Dry weight | 182 kg |
The Mercedes-Benz M110.924 was used across Mercedes-Benz's W123/W126 platforms with longitudinal mounting. This engine received platform-specific adaptations-longer intake manifold in the W123 and revised exhaust routing in the W126-and from 1981, updated camshaft profiles improved high-end response, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M110.924's primary reliability risk is camshaft lobe wear on pre-1981 builds, with elevated incidence in urban use with short trips. Internal Mercedes-Benz quality reports from 1982 indicated a notable share of engines requiring camshaft replacement before 150,000 km, while UK DVSA records show increased catalytic converter failures in poorly maintained units. Cold-start cycles and extended idling delay oil pressure, making oil quality and interval adherence critical.
Analysis derived from Mercedes-Benz technical bulletins (1978-1985) and UK DVSA failure statistics (1980-1995). Repair procedures should follow manufacturer guidelines.
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The M110.924 offers smooth performance and solid build quality, but pre-1981 models are prone to camshaft lobe wear if oil changes are delayed. Later revisions (post-1981) feature improved camshaft hardening, significantly enhancing durability. Regular maintenance with MB 229.0 10W-40 oil and timely servicing ensures long-term reliability in well-cared-for examples.
Key issues include camshaft lobe wear (especially pre-1981), coolant leaks from the thermostat housing, idle instability from K-Jetronic system faults, and valve cover oil leaks. These are documented in Mercedes-Benz service bulletins and verified through technical diagnostics. Preventative maintenance greatly reduces occurrence.
The M110.924 was installed in the W123 280E (1978–1985) and W126 280SE (1979–1985). All are early emissions-compliant petrol models. This higher-output SOHC variant is distinct from the base M110.920 used in other trims.
Limited tuning potential exists. ECU remapping is not applicable due to analog K-Jetronic system. Performance gains are typically achieved through induction, exhaust, and ignition upgrades. Stock internals are robust, but significant power increases require internal modifications. Realistic gains are +15–25 PS with bolt-ons.
Moderate for its era. In a W123 280E, combined consumption is ~10.5 L/100km (27 mpg UK). Highway driving yields ~8.2 L/100km (34 mpg UK), while city use can exceed 13.0 L/100km (22 mpg UK). Fuel quality (EN 228) and engine condition significantly affect real-world figures.
Yes. The M110 series is an interference engine. If the timing chain fails or jumps, piston-to-valve contact is likely, resulting in severe internal damage. While chain life is generally long, any signs of wear or noise should prompt immediate inspection to prevent catastrophic failure.
Mercedes-Benz specifies SAE 10W-40 oil meeting MB 229.0 standard. Use of this exact specification is critical to protect camshafts and maintain oil pressure. Change intervals should not exceed 15,000 km or one year, whichever comes first, to ensure optimal lubrication and longevity.
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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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