PPT Recip Engines Flashcards
What is the purpose of dynamic dampers on crankshafts?
They reduce engine vibration.
Page Reference: JSPT 1-8
What types of bearings are generally found in reciprocating engines?
Plain, ball and roller bearings.
Page Reference: JSPT 1-10
Are the connecting rods used in each cylinder of a radial engine the same? Explain.
No. Radial engines use master and articulating rod assemblies.
Page Reference: JSPT 1-12
Name the different types of piston rings.
Oil control, compression and oil scraper.
Page Reference: JSPT 1-15
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.
Page Reference: JSPT 1-15
What could result from incorrectly installed piston rings?
Excessive oil consumption.
Page Reference: JSPT 1-16
What purpose do oil control rings serve?
They regulate the thickness of the oil film on the cylinder walls.
Page Reference: JSPT 1-16
What is used to help prevent valve surge or floating in an aircraft engine?
Two or more springs are used on each valve.
Page Reference: JSPT 1-22
On engines equipped with hydraulic valve lifters, what should the running valve clearance be?
Zero.
Page Reference: JSPT 1-25
What is the purpose of valve overlap?
It allows better volumetric efficiency and lowers cylinder operating temperatures.
Page Reference: JSPT 1-39
Project: Identify crankshaft parts.
Given: A crankshaft, associated parts, and reference material. Performance Standard: The applicant will identify each part of the crankshaft.
Project: Identify reciprocating engine cylinder parts.
Given: An air-cooled cylinder and reference material. Performance Standard: The applicant will point out the major parts of the cylinder.
Project: Identify and inspect various types of engine bearings.
Given: Plain, needle, roller, and ball bearings, tools, and reference materials. Performance Standard: The applicant will identify the type of bearing and inspect it for defects.
Project: Identify an engine by type without reference material.
Given: An aircraft engine with data plate. Performance Standard: The applicant will visually inspect and list the information from the engine data plate.
