Reciprocating Engines Flashcards
(38 cards)
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
