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 was designed to balance performance with long-term reliability. Its engineering prioritized smooth cruising characteristics and mechanical robustness. Emissions compliance was achieved through a catalytic converter and lambda feedback control, enabling Euro 1 precursor standards for applicable markets.
One documented concern is premature camshaft and follower wear, particularly in engines subjected to extended oil change intervals or improper lubrication. This issue, referenced in Mercedes-Benz Service Bulletin 07-1980-02, is attributed to insufficient oil pressure at cold start and marginal lobe surface hardening in early production units. From 1981, revised camshafts with improved metallurgy were introduced to enhance durability.
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 SOHC 12-valve design provides smooth high-RPM operation ideal for highway cruising but requires strict adherence to 15,000 km oil change intervals using MB 229.0-spec oil to prevent camshaft wear. SAE 10W-40 is critical due to its shear stability and film strength under sustained load. Cold-start idling should be limited to 30 seconds to ensure rapid oil pressure build-up. The Bosch K-Jetronic system demands clean fuel and regular airflow distributor servicing to maintain idle stability. Post-1981 models feature improved camshaft hardening; pre-1981 units should be inspected for lobe wear per Service Bulletin 07-1980-02. Catalytic converters require lead-free petrol meeting EN 228 to prevent poisoning.
Oil Specs: Requires MB 229.0 specification (Mercedes-Benz Service Bulletin 07-1980-02). Compatible with ACEA A2 standards.
Emissions: Euro 1 precursor certification applies to all production years (1978–1985) (VCA Type Approval #VCA/EMS/5677).
Power Ratings: Measured under DIN 70020 standards. Output consistent across all markets (Mercedes-Benz TIS Doc. A110-880).
Mercedes-Benz Technical Information System (TIS): Docs A110-880, A110-885, A110-890, SB 07-1980-02
VCA Type Approval Database (VCA/EMS/5677)
DIN Deutsches Institut für Normung: DIN 70020 Engine Power Measurement
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.
Locate the engine code stamped horizontally on the front-facing side of the cylinder block, near the exhaust manifold (Mercedes-Benz TIS A110-892). The 7th and 8th digits of the VIN indicate engine type ('110.924'). Pre-1981 models have ribbed cam covers with silver finish; post-1981 units use smooth-finish covers. Critical differentiation from M110.920: M110.924 features higher compression and K-Jetronic injection, while M110.920 is lower-output variant. Service parts require VIN verification—camshafts for pre-1981 production are incompatible with later units due to metallurgical revisions (Mercedes-Benz SB 07-1980-02).
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.
Find answers to most commonly asked questions about MERCEDES-BENZ M110924.
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MERCEDES-BENZ Official Site
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EUR-Lex
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GOV.UK: Vehicle Approval & V5C
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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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GOV.UK: Vehicle Approval
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