The 1977 Mercedes 300 D was the second season of the W-123 class, which was a midsized luxury or executive style car. In 1979 a turbo was added to the diesel-powered engine, which made it into a competitive performance car as well as a nicely appointed luxury sedan. The 300 D was made from 1976 through 1985.
Engine
The 300 D's diesel engine had 183.3 cubic inches and produced 85 horsepower at 4,000 rpm and 127 ft.-lbs. of torque at 2,400 rpm. The inline-five-cylinder engine utilized indirect fuel injection, and was naturally aspirated with two valves per cylinder.
The engine had a bore and stroke of 3.58 and 3.64 inches. The fuel-injected mix of fuel and air was compressed to a 21:1 ratio (diesel requires higher compression rates than gasoline engines). The engine operated with a single overhead camshaft.
Power Train
A four-speed, floor-mounted manual transmission was standard in the 300D. An automatic was available as an option. The car rode on a 110-inch wheelbase and had rear-wheel drive.
The car used 197/70 SR 14 tires. This Mercedes has a 17.2-gallon fuel tank and is rated at 23.8 mpg for combined highway and city driving.
Suspension was double wishbone coil springs with anti-roll bar on front, and independent coil springs with anti-roll bar on the rear wheels. Brakes are ventilated discs with power-assist on all wheels.
The model sold in the U.S. was a bit different from the one sold in Europe. The differences included larger bumpers in the U.S., larger headlights and more emission controls.
Dimensions
The 1977 Mercedes 300 D was a midsized car at 186 inches in length. It is 70.3 inches wide and 56.6 inches tall. The front track, or space between the wheels, is 58.6 inches in front and 56.9 inches in back. The turning circle for the car is 37.1 feet.
This Mercedes had a curb weight (without driver or gasoline) of 3,186 lbs. Its gross weight (fully loaded with fuel and people) is 4,332 lbs., leaving a payload of 1,146 lbs.
The Mercedes had a top speed rating of 103 mph.
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