The Pielstick PC series engines are single-acting, medium-speed, four-stroke reversible types. Both in-line and V-configurations are available. The running gear, being a trunk-type engine, is made up of the piston and the connecting rod which joins the single-throw crankshaft. The arrangement of a PC4 engine. The crankcase and frame are constructed from heavy plate and steel castings to produce a low-weight rigid structure.
The crankshaft is underslung and this arrangement confines all stresses to the frame structure. The crankshaft is a one-piece forging and the connecting rods are H-section steel stampings. The one-piece cylinder head contains two exhaust and two inlet valves together with a starting air valve, a relief valve, an indicator cock and a centrally positioned fuel injector.
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Exhaust-gas-driven turbo-chargers operating on the pulse system supply pressurised air to the engine cylinders. Bearing lubrication and piston cooling are supplied from a common system. The engine has a dry sump with oil suction being taken from a separate tank. The cylinder jackets are water-cooled together with the cylinder heads and the exhaust valve cages.
The charge air cooler may be freshwater or sea-water cooled as required. Fuel injection uses the jerk pump system, and a Woodward-type hydraulic governor is used to control engine speed. Later versions of the PC series engine are described as PC20 and PC40 and have somewhat increased scantlings.
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