Manuals
Manufacturer: MercedesBenz
Mercedes-Benz originated in 1926 from the merger of Daimler-Motoren-Gesellschaft and Benz & Cie, whose founders Gottlieb Daimler and Karl Benz independently developed early petrol-powered automobiles in the 1880s. The company has built a reputation for luxury vehicles, commercial trucks, and motorsport success, and it operates today as a division of the Mercedes-Benz Group headquartered in Stuttgart, Germany. Its engineering contributions include the crumple zone, anti-lock braking systems, and early development of airbag technology. More recently, the company has expanded into electric mobility with its EQ line of battery-electric vehicles.
Model: 300D
The Mercedes-Benz 300D served as the diesel-powered variant of the brand's mid-size executive sedan lineup, first appearing in 1975 on the W115 chassis before continuing through the W123 and W124 generations. It was positioned as a fuel-efficient, durable alternative to gasoline models, targeting buyers who prioritized longevity and low running costs. The W123-generation 300D, produced from 1976 to 1985, became particularly well known for the longevity of its OM617 five-cylinder diesel engine. Typical strengths across its generations included robust build quality, strong fuel economy, and the ability to accumulate very high mileage with proper maintenance.
Year: 1977-1985
The Mercedes-Benz 300D (W123) was sold from 1977 to 1985, initially with a naturally aspirated 3.0-liter five-cylinder diesel and, from 1981, a turbocharged variant producing roughly 120 horsepower. Common service items include glow plug and fuel filter replacement, injection pump and injector maintenance, and timing chain inspection on high-mileage engines. These cars are also prone to rust in the floor pans, fenders, and trunk, and aging vacuum and rubber components can affect turbocharged models.
Code: W123
The W123 300D uses a rear-wheel-drive layout with the OM617 five-cylinder diesel engine, paired with either a four-speed manual or four-speed automatic transmission. From 1982, the 300D Turbodiesel added a turbocharger to the same engine family. Typical maintenance focuses on the mechanical fuel injection pump, timing chain tensioner, valve adjustments, and glow plugs, while body rust and vacuum-system leaks on automatic cars are also common concerns.
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W123 Service Manual W123 service manual.zip -
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2610 Manual Transmission, Checking & Correcting Oil Level 2610 - Manual transmission, checking & correcting oil level.pdf -
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A a.pdf -
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W123 716 Manual Transmission Manual W123 716 Manual transmission Manual.pdf -
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Bosch RW Governor Operation Bosch- RW-Governor operation.pdf -
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Introduction introduction.pdf -
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