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Interior and oil sump of an Tohatsu MFS30B outboard motor. Within piston engines, a wet sump is part of a lubrication system whereby the crankcase sump is used as an integral oil reservoir. An alternative system is the dry sump, whereby oil is pumped from a shallow sump into an external reservoir. [1]
The O-320 uses a conventional wet sump system for lubrication. The main bearings, connecting rods, camshaft bearings, tappets and pushrods are all pressure lubricated, while the piston pins, cylinder walls and gears are all lubricated by spray. The oil system is pressurized by an accessory-drive mounted oil pump.
Schematic diagram of a basic dry-sump engine lubrication system. The oil collects in sump (1), is withdrawn continuously by scavenge pump (2) and travels to the oil tank (3), where gases entrained in the oil separate and the oil cools. Gases (6) are returned to the engine sump.
In a common oiling system, oil is drawn out of the oil sump (oil pan, in US English) through a wire mesh strainer that removes some of the larger pieces of debris from the oil. The flow made by the oil pump allows the oil to be distributed around the engine.
The OM636 is a water-cooled inline-four-cylinder diesel engine with precombustion chamber injection, eight valves, OHV valvetrain and wet sump lubrication. It has a cross-flow cylinder head made of grey cast iron. The cylinder block material is also grey cast iron.
"H" in the model number indicated "horizontal". The cylinders were inclined slightly upwards at 17½ degrees. Wet sump lubrication was used. [6] Many of the ancillaries and servicing points were relocated to what were now the sides of the engine, so that they could be serviced from the sides of the railcar, rather than having to lift out floor ...
In contrast to the M178, this version of the engine uses wet-sump lubrication. In the C63 and GLC63 applications, the turbos are single-scrolled, whereas in E63 and S63 are twin-scrolled and different exhaust manifold. The twin-scroll application also features cylinder deactivation. [6]
The rocker arms, which are supported in bronze bearings, are lubricated by the wet sump lubrication system. They are secured with a horizontal screw each. [ 15 ] The fuel is pumped to the injection nozzles by a Bosch size A injection pump , that is driven by the gear between the flange and camshaft gear on the camshaft.