reciprocating piston engine lubrication system
TRANSCRIPT
Reciprocating piston engine lubrication system
Functions of Oil
Reduce Friction
Absorb Heat
Seals
Cushions
Cleans
Corrosion
Reciprocating piston engine lubrication system
• Reduce Friction
Reciprocating piston engine lubrication system
• Absorb Heat– Oil is a heat-transfer medium which flows
through the crankcase and oil coolers, and dissipates the heat from moving parts, thus constantly cooling engine bearings and piston rings.
• Absorb Heat– Air-cooled aircraft engines rely on their oil for
cooling far more than water-cooled automotive engines. Automotive oil typically accounts for about 40 percent of the engine's cooling capacity. In aviation engines, the oil must carry off a greater percentage of the engine's heat.
Reciprocating piston engine lubrication system
• Seals– Aviation oil not only provides a seal between
the rings and cylinder walls, but also helps seal the gasket areas and the rubber or synthetic seals for the crankshaft. When oil washes around those areas, it helps retain a seal. Thus, aviation oil must be of a blend or formulation that is compatible with the seal materials so that the seal itself lasts longer.
Reciprocating piston engine lubrication system
• Cushions– Oil properties can include boundary or mixed film, dynamic,
hydrodynamic, and elastohydrodynamic forms. – Boundary or mixed film lubrication is found in the upper cylinder
area in the outer boundary of an aircraft engine. This is the most remote engine area to lubricate because the oil rings scrape most of the oil film off the cylinder walls before it reaches the upper cylinder. However, there must be a residual amount of lubrication in the upper cylinder to protect the engine on startup. Also, if an engine has been sitting idle for a month, some lifters have been pressed against cam faces and loaded under maximum spring pressure. Most of the oil has been squeezed out of that junction.
Reciprocating piston engine lubrication system
• Cleans– All aviation oils clean. When we say an aviation oil
cleans, we think of removing sludge, varnishes, and grunge accumulations in the oil pan, on plugs, or in the screen. However, when a lubricant keeps your airplane engine clean, it also means a clean ring belt area and better control of the combustion process. When those rings are able to move freely, your engine operates at higher efficiencies, has better ring seal, produces less blow-by, and consumes less oil
Reciprocating piston engine lubrication system
• Corrosion
Reciprocating piston engine lubrication system
• Ash cannot be added to aviation piston engine oils. Regulations prohibit the use of ash-bearing detergents and anti-wear, zinc-dithio-phosphate that are used in automotive or diesel truck engine oils because they may cause pre-ignition or detonation in an aircraft engine.
Reciprocating piston engine lubrication system
• Dispersants, flow-improvers, anti-foam, anti-rust, anti-corrosion, and oxidation inhibitors can all be found in aviation oils, as can some ashless, anti-wear additives.
Reciprocating piston engine lubrication system
Reciprocating piston engine lubrication system
Reciprocating piston engine lubrication system
Reciprocating piston engine lubrication system
Oil Filter adapter
Reciprocating piston engine lubrication system
Filter Inspection
Oil Filter
Oil filter operation
Reciprocating piston engine lubrication system
Reciprocating piston engine lubrication system
Reciprocating piston engine lubrication system
Reciprocating piston engine lubrication system
Reciprocating piston engine lubrication system
