Powerplant Chapter 1 FAA ORAL questions - Reciprocating engines Flashcards
What is the purpose of dynamic balancers 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 a radial engine uses a master rod and articulating rod assemblies.
Name the different types of piston rings.
Oil control, compression, and oil scraper.
Where should piston rign gaps be installed relative to each other?
Compression ring gaps should be staggered so that htey do not align. This prevents excessive blow by.
What could result from improperly 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 prevent valve sprin surge or floating in an aircraft engine?
Two or more springs are used on each valve.
One engines equipped with hydraulic lifters what should the running clearance be?
Zero.
What is the purpose of valve overlap?
It allows better volumetric effciency and lowers cylinder operating temperatures.
