A&P - Powerplant Oral (Jeppesen) Questions with 100% Correct Answers | Latest Version 2024 | Verified

What is the purpose of dynamic dampers on crankshafts? - They reduce engine vibration. What types of bearings are generally found in reciprocating engines? - Plain, ball and roller bearings. Are the connecting rods used in each cylinder of a radial engine the same? Explain. - No. Radial engines use master and articulating rod assemblies. Name the different types of piston rings. - Oil control, compression, and oil scraper. Where should piston ring gaps be installed relative to each other, and why? - Compression ring gaps should be staggered so that they do not align. This prevents excessive blow-by. What could result from incorrectly installed piston rings? - Excessive oil consumption. What purpose do oil control rings serve? - They regulate the thickness of the oil film on the cylinder walls. What is used to help prevent valve surge or floating in an aircraft engine? - Two or more springs are used on each valve. On engines equipped with hydraulic valve lifters, what should the running valve clearance be? - Zero. What is the purpose of valve overlap? - It allows better volumetric efficiency and lowers cylinder operating temperatures What indications are given in the event of a leaking or open primer while the engine is running? - The engine will not idle properly.A cold cylinder is found when troubleshooting a running engine. What does this indicate? - No combustion in that cylinder. When pulling a propeller through, a hissing sound is heard, indicating valve blow-by. What procedure should be performed next? -