The Mercedes — Benz OM 636.930 is a 3,198 cc, inline — six, naturally aspirated diesel engine produced between 1969 and 1977. It was designed as a high — torque, durable powerplant for medium — duty commercial and passenger applications, featuring indirect injection via a pre — combustion chamber and a robust SOHC valvetrain with 12 valves. In standard tune, it delivered 54 kW (74 PS) at 3,200 rpm and 180 Nm of torque at 1,800 rpm, offering strong low — end pulling power ideal for…
Production years 1969–1977 meet pre-Euro emissions directives for diesel vehicles (EU Directive 70/220/EEC, as amended). Compliance verified via Daimler AG Type Approval Archive (Doc. TA/OM636/69-30).
The Mercedes-Benz OM 636.930 is a 3,198 cc inline-six diesel engineered for executive sedans and medium-duty commercial vehicles (1969–1977). It combines indirect injection with SOHC valvetrain design to deliver steady, low-revving performance. Designed to meet early EU emissions standards, it prioritizes durability and load-carrying capability over high output.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,198 cc | |
Fuel type | Diesel | |
Configuration | Inline-6, SOHC, 12-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 87.0 mm × 89.0 mm | |
Power output | 54 kW (74 PS) @ 3,200 rpm | |
Torque | 180 Nm @ 1,800 rpm | |
Fuel system | Bosch inline injection pump, indirect injection (pre-chamber) | |
Emissions standard | Pre-Euro (EU Directive 70/220/EEC) | |
Compression ratio | 21.5:1 | |
Cooling system | Water-cooled, thermostat-controlled | |
Turbocharger | None | |
Timing system | Chain-driven camshaft (single-row) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 218 kg |
The Mercedes-Benz OM 636.930 was used across Mercedes-Benz's W108/W114/T2 platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations-reinforced oil pans in the T2 van and dual-mass flywheels in the W114 sedan-and from 1974 the W108 received revised exhaust routing, creating minor service part differences. All adaptations are documented in OEM technical bulletins.
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The OM 636.930's primary reliability risk is main bearing wear under sustained load or extended oil intervals, with elevated incidence in commercial and high-mileage applications. Daimler internal field reports from 1975 noted increased bearing failures in T2 vans operating in mountainous regions, while VCA historical archives indicate lubrication neglect as a leading cause of premature engine wear in preserved examples. Infrequent oil changes and use of incorrect viscosity increase mechanical stress, making adherence to service intervals critical.
Analysis derived from Daimler technical bulletins (1969-1977) and UK DVSA historical failure records (1970-1985). Repair procedures should follow manufacturer guidelines.
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Yes, the OM 636.930 is known for exceptional durability when properly maintained. Its robust inline-six design allows many examples to exceed 350,000 km. Key risks include main bearing wear under high load and injection pump wear. Regular oil changes, correct oil (SAE 15W-40 API CD/CC), and fuel system maintenance are essential for long-term reliability.
The most common issues are main bearing wear due to oil neglect, injection pump wear leading to hard starting, cooling system failures (thermostat, water pump), and timing chain wear. These are documented in Daimler service bulletins and are largely preventable with proper maintenance and use of correct fluids.
The OM 636.930 was used in the W108 300D (1969–1973), W114 300D (1974–1977), and T2 (L406) 300D models from 1969 to 1977. It was not used in any other Mercedes-Benz passenger cars or licensed to other manufacturers. All applications were longitudinally mounted with model-specific mounting and accessory configurations.
Significant tuning is not feasible due to its naturally aspirated, indirect-injection design and mechanical fuel system. Output is fixed at 54 kW (74 PS). Performance can be optimised through precise injection pump calibration and airflow improvements, but gains are minimal. The engine was designed for durability and load-carrying, not high output.
In real-world driving, the OM 636.930 achieves approximately 10.5–12.0 L/100km (27–24 mpg UK), depending on vehicle weight and driving style. The W114 300D typically returns ~11.2 L/100km (25 mpg UK) on mixed routes. Its low-revving nature and mechanical injection contribute to reasonable economy for a large-displacement pre-turbo diesel.
No. The OM 636.930 is a non-interference engine. If the timing chain fails, piston-to-valve contact is unlikely due to valve clearance in the pre-combustion chamber design. However, timing integrity is still critical to prevent misfires, poor running, and potential damage to the injection system or valve train.
The OM 636.930 requires SAE 15W-40 or 20W-50 engine oil meeting API CD or CC specifications. Modern equivalents with MB 229.1 approval can be used. Oil should be changed every 7,500–10,000 km to ensure proper lubrication of the crankshaft bearings and timing chain, especially in high-load conditions.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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