Reciprocating Engines Flashcards
- How are conventional reciprocating engines classified?
By cylinder arrangement. (V-type, in line, opposed)
- What are the different types of piston rings?
Compression rings
Oil control Rings
Scraper Rings
- What are the main causes of a cylinder having low compression?
Broken piston rings
Rings not seated
Burnt valves
Poorly seated valves
- What is the purpose of the oil control rings?
Controls thickness of pool film on cylinder wall
- What may be the result of installing piston rings incorrectly?
Excessive oil consumption
- What types of piston rods are commonly found in radial engines?
Master & articulating rod assembly
- What type of bearings are general use in reciprocating engines?
Plain
Roller
Ball Bearings
- What is the indication of valve blow by?
Hissing or whistle while pulling propeller around
- What is the purpose of using more than one spring for valve closing?
Prevent valve surging
- What is the purpose of valve overlap?
Better volumetric efficiency & lowers the cylinder operating temps
- Describe the inspection you would give the valve springs during engine overhaul?
Cleaned
Inspected for overheating,cracks, broken ends, & compression strength
- What is the purpose of using valves with sodium filled stems?
Excellent heat conductor, once melts, sodium is circulated carrying heat from the valve head to the stem
- What causes ending sudden stoppage?
Sticking an object or engine seizure from internal damage
- What type of inspection must be made after sudden stoppage of an engine?
Tear down & inspection
- What is the purpose of the crankshaft dynamic dampers used in aircraft engines?
Reduce vibrations from pistons
- How would you make a “runout” check on a crankshaft that is still installed on the engine?
Remove propeller
Attach dial indicator to front of engine crankcase position needle on crankshaft
Check specs
- What is detonation?
Uneven fuel - air mixture & critical fuel temperature & compression will cause explosive spontaneous ignition
- What’s cylinder is engine to magneto timing based on?
1 Cylinder
- What is engine sudden speed reduction?
Propeller strike but engine continues to run
- What can be learned about the condition of an engine by studying the results of a compression check?
If valves, piston rings, pistons are adequately sealing combustion chamber
- How can a cold cylinder be located on a double row radial engine?
Infrared laser thermometer
- What instrument can be used to check bore for out of roundness?
Dial indicator
Telescopic gauge
Outside micrometer
Inside micrometer
- What would a cold cylinder indicate?
No combustion
- Where is a crack most likely to occur on a piston?
Piston pin connects
- What should be done to a nose wheel airplane before removing the engine?
Support the tail
- What is the running valve clearance on engines equipped with hydraulic lifters?
Zero
