Lubrication Systems Review Questions and Answers Already Passed

Lubrication Systems Review Questions and Answers Already Passed What does the term "viscosity" refer to when discussing engine lubricating oil? Viscosity describes the thickness of the oil and its resistance to flowing. How does a wet sump lubrication system operate? In a wet sump system, the oil is contained within the engine’s crankcase. This setup has limitations like reduced oil capacity, challenges with cooling, and generally higher operating temperatures. What characterizes a dry sump lubrication system? A dry sump system involves storing oil in an external tank separate from the engine. The system includes a check valve to prevent oil from flowing back into the engine when it's not running. What are the main functions of a lubricant? Lubricants primarily reduce friction, cool engine components such as pistons and cylinder walls, provide sealing, cushion parts, clean surfaces, and offer protection. 2 Where can sludge chambers be found in a reciprocating engine? Sludge chambers are situated within the crankshaft throws. How much expansion space is needed for oil tanks in reciprocating engines? Oil tanks in reciprocating engines should have an expansion space of at least 10% of the tank's capacity or 0.5 gallons, whichever is greater. For turbine engines, the required expansion space is typically a percentage of the total capacity. Which component regulates the maximum oil pressure within an engine? The oil pressure relief valve controls the highest allowable pressure in the engine. What role does the scavenge pump play in a GTSIO-520 engine? A scavenge pump helps return oil to the oil sump or tank when gravity or air pressure alone isn't sufficient. What are the two primary types of lubrication systems used in reciprocating engines? Reciprocating engines typically use either a wet sump or a dry sump lubrication system. 3 In the Continental engines in the lab, oil is routed back from the valve rocker arm area through the push rod tubes. Is this the case with Lycoming engines as well, or is there a different method? For Lycoming engines, oil is returned via a scavenger pump. How is the oil tank ventilated in a dry sump reciprocating engine? The oil tank in a dry sump system is vented to the engine's crankcase. Why is oil with relatively high viscosity chosen for reciprocating engines? High-viscosity oil is used because reciprocating engines often have larger clearances and operate under high temperatures and pressures.