AERM 2447 - Reciprocating Engine Overhaul Questions & Answers
On which part of the cylinder walls of a normally operating engine will the greatest amount of wear
occur? - Correct Answer-Near the top of the cylinder.
When is the fuel/air mixture ignited in a conventional reciprocating engine? - Correct Answer-Shortly
before the piston reaches the top of the compression stroke.
Consider the following statements:
(1)Only cast-iron piston rings can be used in nitrided or chromium-plated cylinders.
(2)Chromium-plated rings may be used in plain steel cylinders.
Of these two statements, - Correct Answer-both No. 1 and No. 2 are true.
The actual power delivered to the propeller of an aircraft engine is called - Correct Answer-brake
horsepower.
During overhaul, reciprocating engine intake and exhaust valves are checked for stretch - Correct
Answer-with a contour gage.
Crankshaft runout is checked - Correct Answer-during engine overhaul and in case of sudden stoppage
of the engine.
If an engine cylinder is to be removed, at what position in the cylinder should the piston be? - Correct
Answer-Top dead center.
Which of the following engine servicing operations generally requires engine pre-oiling prior to starting
the engine? - Correct Answer-Engine installation.
Straightening of nitrided crankshafts is - Correct Answer-not recommended.
What tool is generally used to measure the crank-shaft rotation in degrees? - Correct Answer-Timing
disk.
During overhaul, the disassembled parts of an engine are usually degreased with some form of mineral
spirits solvent rather than water-mixed degreasers primarily because - Correct Answer-water-mixed
degreaser residues may cause engine oil contamination in the overhauled engine.
Which statement is correct regarding engine crank-shafts? - Correct Answer-Moveable counterweights
serve to reduce the torsional vibrations in an aircraft reciprocating engine.
How is proper end-gap clearance on new piston rings ensured during the major overhaul of an engine? -
Correct Answer-By placing the rings in the cylinder and measuring the end gap with a feeler gauge.
When can it be concluded that a reciprocating engine with a dry sump has been pre-oiled sufficiently? -
Correct Answer-When oil flows from the engine return line or indicator port.
Some cylinder barrels are hardened by - Correct Answer-nitriding.
Full-floating piston pins are those which allow motion between the pin and - Correct Answer-both the
piston and the small end of the connecting rod.
During overhaul, reciprocating engine exhaust valves are checked for stretch - Correct Answer-with a
contour or radius gauge.
An aircraft reciprocating engine using hydraulic valve lifters is observed to have no clearance in its valveoperating mechanism after the minimum inlet oil and cylinder head temperatures for takeoff have been
reached. When can this condition be expected? - Correct Answer-During normal operation.