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Powerplant O&P
Reciprocating Engines
Question | Answer |
---|---|
What is the purpose of dynamic dampers on crankshafts? | They reduce engine vibration. |
What types of bearings are generally found on reciprocating engines? | Plain, roller, and ball bearings. |
Are the connecting rods used in each cylinder of a radial engine the same? | No. Radial engines use master and articulating rod assemblies. |
Name the different types of piston rings. | Oil scraper, compression, and oil control. |
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 tolerance be? | Zero |
What is the purpose of valve overlap? | It allows better volumetric efficiency and lowers cylinder operating temperatures. |