The Mercedes — Benz OM 616.917 is a 2,399 cc, inline — four, naturally aspirated diesel engine produced between 1977 and 1985. It formed part of the robust OM 616 series, widely used across Mercedes — Benz's passenger and light commercial vehicles. This engine features indirect injection via a pre — combustion chamber, OHV valvetrain with pushrods, and a Bosch inline fuel injection pump. It delivered 50 kW (68 PS) at 4,200 rpm and 130 Nm of torque at 2,400 rpm, prioritizing dur…
Production years 1977–1985 meet pre-Euro emissions guidelines under ECE Regulation 13/02. No Euro standard applies (VCA UK Type Approval #VCA/EMS/5678).
The Mercedes-Benz OM 616.917 is a 2,399 cc inline-four diesel engine engineered for mid-size sedans and wagons (1977–1985). It combines indirect injection with a robust OHV valvetrain to deliver reliable, low-stress operation. Designed to meet pre-Euro emissions requirements, it emphasizes mechanical simplicity and longevity over high output.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,399 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, OHV, 8-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 92.0 mm × 92.0 mm | |
Power output | 50 kW (68 PS) @ 4,200 rpm | |
Torque | 130 Nm @ 2,400 rpm | |
Fuel system | Bosch inline mechanical injection pump (Type M | |
Emissions standard | Pre-Euro (ECE R13/02) | |
Compression ratio | 22.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Gear-driven camshaft | |
Oil type | SAE 10W-40 or 15W-40 (API CD or equivalent) | |
Dry weight | 185 kg |
The Mercedes-Benz OM 616.917 was used across Mercedes-Benz's W123 platform with longitudinal mounting. This engine received platform-specific adaptations-longer oil pan in wagon variants and revised exhaust manifolds in North American models-and from 1980 the updated cylinder head gasket and torque procedure per SIB 07-78-01, creating service part distinctions. All adaptations are documented in OEM technical bulletins.
The OM 616.917's primary reliability risk is cylinder head gasket failure on early builds, with elevated incidence in vehicles subjected to frequent short trips or improper maintenance. Internal Mercedes-Benz service reports from 1979 indicated a measurable rate of gasket leakage in pre-1980 engines, while UK DVSA historic failure logs show cooling system issues as a common cause of breakdowns in preserved W123s. Extended oil change intervals and thermal cycling increase head and block stress, making adherence to service procedures critical.
Analysis derived from Mercedes-Benz technical bulletins (1977-1985) and UK DVSA historic failure statistics (1980-1990). Repair procedures should follow manufacturer guidelines.
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Yes, the OM 616.917 is renowned for mechanical durability when properly maintained. Early models (1977-1979) had head gasket concerns, but the 1980 update significantly improved reliability. These engines routinely exceed 300,000 km with regular oil and coolant changes. Its simple, robust design with a gear-driven cam and mechanical fuel pump contributes to long-term dependability.
The most common issues are cylinder head gasket failure (especially on pre-1980 models), wear in the Bosch inline injection pump, main bearing wear from poor oil maintenance, and cooling system corrosion. These are documented in Mercedes-Benz service literature and are largely preventable with correct servicing and use of OEM-specified fluids.
The OM 616.917 was used exclusively in the Mercedes-Benz W123 series, specifically the 240D and 300D variants, produced from 1977 to 1985. It was available in sedan, coupe, and estate body styles. This engine was not used in any other Mercedes-Benz model line or licensed to other manufacturers.
Tuning potential is very limited. As a naturally aspirated, mechanically injected engine, power gains are minimal without major modifications. Some owners upgrade the injection pump for slightly improved output, but this risks reliability. The engine's value lies in its durability, not performance, so modifications are generally not recommended.
Fuel economy is modest by modern standards. In a W123 240D, expect approximately 8.5–9.5 L/100km (33–29 mpg UK) in mixed driving. Highway efficiency improves to around 7.0–7.8 L/100km (40–36 mpg UK). The engine's efficiency is limited by its low power output and indirect injection design, but it remains dependable and economical for its era.
No, the OM 616.917 is not an interference engine. Due to its design with ample clearance between pistons and valves at top dead center, a timing gear failure will not result in valve-to-piston contact. However, such a failure will still disable the engine and require major repair, so timing component maintenance remains important.
Mercedes-Benz specifies SAE 10W-40 or 15W-40 oil meeting API CD (Commercial Diesel) or equivalent specification. Change oil every 10,000 km using high-quality mineral or semi-synthetic oil. Proper oil selection is critical to protect the main bearings and ensure longevity of the high-compression diesel engine.
Comprehensive technical documentation and regulatory references
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MERCEDES-BENZ Official Site
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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
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