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Jet Engine Lube System

A look at the components of a typical jet engine lube system, and a simplified explanation of how they all work together. We use examples of each component from several different engines, and we go through some hand-made diagrams... Piston engines need lubrication for the sliding of piston rings against cylinder walls, and lubrication of journal bearings. The oil also is used as a coolant, sometimes even sprayed on the undersides of pistons. Turbine engines use high temperature tolerant oil to cool the roller bearings supporting the main rotor. The oil is also used as a lubricant for the accessory drive gearboxes. Piston engine oil is higher in viscosity, and turbine engine oil is higher in temperature tolerance. Engine oil has 5 functions: 1 - Lubrication 2 - Cooling 3 - Carrying away contaminants and wear debris 4 - Power transmission 5 - Corrosion prevention #4 may seem odd. Think hydraulic valve lifters and cam phasers in piston engines. In Turbine engines, think vsv actuators and torque meters. The functions are prioritized differently: Piston engines 1 2 4 3 5 Turbine engines 2 3 1 4 5 That's my comparison.