57 Reciprocating Engines - Insyall, Inspect, Repair, Service

Question 1

Using the following information, determine how many degrees the crankshaft will rotate with both the intake and exhaust valves seated.
Intake opens 15° BTDC.
Exhaust opens 70° BBC.
Intake closes 45° ABDC.
Exhaust closes 10° ATDC.

Answer 1

245 °

Question 2

An aircraft reciprocating engine using hydraulic valve lifters is observed to have no clearance in its valve-operating mechanism after the minimum inlet oil and cylinder head temperatures for takeoff have been reached. When can this condition be expected?

Answer 2

During normal operation

Question 3

What tool is generally used to measure the crankshaft rotation in degrees?

Answer 3

Timing disk.

Question 4

During overhaul, reciprocating engine exhaust valves are checked for stretch

Answer 4

with a contour or radius gauge.