Reciprocating Engines Flashcards
A cold cylinder is found when troubleshooting a running engine. What does this indicate
No combustion in the cylinder
When pulling a propeller through a hissing sound is heard, indicating valve blow-by. What procedure should be performed next
A compression check to identify faulty cylinder
What is the purpose of performing a compression test
To determine if the valves, pistons and rings are sealing properly
Name some of the precautions that should be performed prior to engine removal
Disconnect the battery, turn off the fuel valves, chock the wheels, and if necessary, install a tail stand
When inspecting a piston where are cracks most likely to be found
In areas with high stress
- Base of piston bosses
- Inside at the junction of the bore and walls
- Ring lands
What does it mean if an engine part is within serviceable limits
The part is within manufactures limits and can be used in an engine
What tools or instruments are used to inspect a cylinder barrel for out of roundness
Dial indicator or inside micrometer
What publication is used to check an engine for normal operation
Manufacturers maintenance manual
A weak cylinder is found during a compression check. What must be inspected
Pressure is transmitted equally in all directions
What does a tachometer indicate on a reciprocating engine
Engine R.P.M
Is the aircraft electrical system required to power a cylinder head temperature gage
No. Thermocouple is the source
Where should the thermocouple be installed on a reciprocating engine using a single probe cylinder head temperature system
On the hottest cylinder
What directly controls manifold pressure
Throttle opening and engine r.p.m
During engine operation where should the propeller control be set when checking the manifold pressure
Low pitch, high r.p.m
What unit of measure is generally used to indicate fuel flow
Pounds or gallons per hour
Name the basic components of a fuel system
Transmitter and the indicator
What is the fuel pressure range on float type carburetors
3 to 5 psi
Where would a carburetor air temperature bulb be located
In the ram air intake duct
What inspection should be performed on an engine that has been in storage
inspect for corrosion or damage
What purpose does an oil analysis serve
shows normal and abnormal wear of the engine.
What inspection should be performed after a propeller strike without sudden stoppage
- Inspect engine mounts , crankcase and nose section for damage
- Inspect oil and oil filters/ screens for metal partials
- Inspect crankshaft or driveshaft for cracks and misalignment
What are two main causes of a cylinder having low compression
Piston rings and valves not seating or broken
How is a hydraulic lock removed from an aircraft engine
Remove a spark plug from the locked cylinder and drain all of oil out. Clean the spark plug and replace it
In what position should the crankshaft be when a magneto is being timed to the engine
30 degrees before top center on the compression stroke
What must be inspected to determine the airworthiness of an engine installation
Propeller, lubrication ,ignition,fuel metering,cooling and the exhaust systems
Where can you find the correct grade of fuel and amount of engine lubricating oil for an aircraft engine
Type certificate data sheet for the aircraft
What is the purpose of dynamic dampers on crankshafts
Reduce engine vibration
What type of bearings are generally found in reciprocating engines
Plain, ball and roller bearings
Name the different types of piston rings
Oil control, compression an oil scraper
What could result from incorrectly installed piston rings
Excessive oil consumption
What is used to help prevent valve surge or floating in an engine
Two or more springs are used on each valve
On engines equipped with hydraulic valve lifters what should the running valve clearance be
Zero
What is the purpose of valve overlap
It allows better volumetric efficiency and lowers cylinder operating temperatures
What are the purpose of oil control rings
Used to control the thickness of the oil film on the cylinder walls
What type of piston rod are commonly found in radial engines
Master and articulating rod assembly
What caused an engine to sudden stop
Striking an object or engine seizure due to internal damage
What indications are given in the event of a leaking or open primer while the engine is running
Engine will not idle properly
A cold cylinder is found when troubleshooting a running engine. What does this indicate
No combustion in that cylinder
