Mercedes-Benz OM 5 engine

The Mercedes-Benz OM 5 was a six-cylinder inline, four-stroke diesel engine built by Daimler-Benz. It was presented in 1927 as the drive for the company's L 5 truck, series production began in 1928, and it was replaced by the OM 59 in 1932. It used precombustion chamber injection, water cooling and pressure circulation lubrication, with a gear-driven side camshaft and seven crankshaft bearings. Bore and stroke were 105 mm by 165 mm, giving a displacement of 8,572 cubic centimetres. Daimler-Benz resolved to develop it on 28 September 1925, and Hans Nibel and Fritz Nallinger were chiefly responsible for the design. The target was 85 PS at 1,300 rpm, but the engine reached a high mean working pressure that it could not withstand, which shortened piston life, so the series version was detuned to 60 PS (44 kW) at the same speed. A new Bosch inline injection pump from 1928 helped make the engine practical. The L 5 was at first the only Daimler-Benz truck offered with a diesel, and the OM 65 and OM 67 were later developed from the OM 5's design.