BAKERS ORAL POWERPLANT QUESTIONS

How are reciprocating engines classified? - Answer-1) Cylinder Arrangement w/ respect to crankshaft (in-line, V-type, radial and opposed) 2) Method of cooling (liquid cooled, or air cooled) what are the different types of piston rings - Answer-compression rings, oil control rings and scraper rings what are the main causes of a cylinder having low compression - Answer-broken piston rings, rings that are not seated properly, burnt valves and poorly seating valves what is the purpose of the oil control rings? - Answer-they are used to control the thickness of the oil film on the cylinder walls what may be the result of installing piston rings incorrectly - Answer-excessive oil consumption what type of piston rods are commonly found in radial engines - Answer-a master and articulating rod assembly what type of bearings are in general use in reciprocating engines - Answer-plain, roller and ball bearings what is the indication of valve blowby - Answer-a hissing or whistle when pulling the propeller through by hand what is the purpose of using more than one spring for valve closing - Answer-valve springs will resonate (or surge) at certain engine speeds. what is the purpose of valve overlap - Answer-better volumetric efficiency and lowers the cylinder operating temperatures describe the inspection you would give the valve springs during engine overhaul - Answer-they should be cleaned thoroughly, then visually inspected for evidence of overheating, cracks, broken ends, and compression strengh what is the purpose of using valves with sodium filled stems - Answer-because it is an excellent heat conductor what causes engine sudden stoppage - Answer-Striking an object or engine seizure due to internal damage. What type inspection must be made after sudden stoppage of an engine? - Answer-a complete eng