Chapter 1 - Reciprocating Engines.------------ ---------------------------------------------------------
----------------
What is the purpose of dynamic dampers on They reduce engine vibration.
crankshafts?
What types of bearings are generally found Plain, Ball and Roller bearings.
in reciprocating engines?
No. Radial engines use master and articulating rod assemblies.
Are the connecting rods used in each
cylinder of a radial engine the same?
Explain.
Name the different types of piston rings. Oil Control, Compression and Oil Scraper.
Where should piston ring gaps be installed Compression ring gaps should be staggered so that they do not align. This prevents
relative to each other, and why? excessive blow-by.
Excessive oil consumption.
What could result from incorrectly installed
piston rings?
What purpose do oil control rings serve? They regulate the thickness of the oil film on the cylinder walls.
What is used to help prevent valve surge or Two or more springs are used on each valve.
floating in an aircraft engine?
Zero.
On engines equipped with hydraulic valve
lifters, what should the running valve
clearance be?
What is the purpose of valve overlap? It allows better volumetric efficiency and lowers cylinder operating temperatures.
---------------------------------------------------------
Chapter 2- Reciprocating Engine Operation,
Instruments, Maintenance, and Overhaul. ---
----------------------------
The engine will not idle properly.
What indication are given in the event of a
leaking or open primer while the engine is
running?
No combustion in that cylinder.
A cold cylinder is found when
troubleshooting a running engine. What
does this indicate?
A compression check should be performed to identify the faulty cylinder.
When pulling a propeller through, a hissing
sound is heard, indicating valve blow-by.
What procedure should be performed next?
What is the purpose of performing a To determine if the valves, pistons and rings are sealing properly.
compression test?
The total time on the engine must be continued and the time since major overhaul is
When an engine is overhauled, how is its entered into the engine log. If the manufacturer rebuilds the engine, it is granted a
total time affected? When an engine is zero-time status and is considered to have no previous operating history.
rebuilt, how is its operating history affected?
, 1- Inspect engine mounts, the crankcase, and the nose section for damage. 2- Inspect
What inspections should be performed after the oil and oil filters/ screens for metal particles. 3- Inspect the crankshaft or driveshaft
a propeller strike without sudden stoppage? for cranks and misalignment.
Name some of the precautions that should Disconnect the battery, turn off the fuel valves, chock the wheels, and if necessary,
be performed prior to engine removal. install a tail stand.
When inspecting a piston, where are cracks In those areas that are highly stressed; usually the base of the piston bosses, inside at
most likely to be found? the junction of the bore and the walls, and the ring lands.
What does it mean if an engine part is within It means that the part is within the manufacturer's limits and can be used in an engine.
Does not require replacement.
serviceable limits?
A dial indicator or an inside micrometer is usually used to measure the top of the
What tools or instruments are used to cylinder and at the skirt. A telescopic gauge and micrometer can also be used. Two
inspect a cylinder barrel for out-of- reading should be taken 90# to each other.
roundness?
How can a loose stud in an engine Remove the loose stud and inspect the hole for size and thread condition. It may be
crankcase be repaired? necessary to use an oversize stud or Heli-Coil insert.
Manufacture's maintenance manual.
What publication is used to check an engine
for normal operation?
Pressure is transmitted equally in all directions.
A Weak Cylinder is found during a
compression check. What must be
inspected?
Metal particles in the oil show normal and abnormal wear of the engine. This helps in
What purpose does an oil analysis serve? evaluating the engine's internal condition.
Perform an inspection to determine if there is any corrosion damage.
What inspection should be performed on an
engine that has been in storage?
In the ram air intake duct.
Where would a carburetor air temperature
bulb be located?
What is the fuel pressure range on float-type 3 to 5 PSI.
carburetors?
The transmitter and the indicator.
Name the basic components of a fuel
system.
Pounds or gallons per hour.
What unit of measure is generally used to
indicate fuel flow?
Why is fuel flow monitored? To determine fuel consumption and engine performance.
It measures the absolute pressure in the engine manifold and is calibrated in inches of
What does the manifold gauge indicate and
mercury.
how is it calibrated?
What directly control manifold pressure? Throttle opening and engine r. p. m.
Low pitch, high r. p. m.
During engine operation, where should the
propeller control be set when checking the
manifold pressure?
----------------
What is the purpose of dynamic dampers on They reduce engine vibration.
crankshafts?
What types of bearings are generally found Plain, Ball and Roller bearings.
in reciprocating engines?
No. Radial engines use master and articulating rod assemblies.
Are the connecting rods used in each
cylinder of a radial engine the same?
Explain.
Name the different types of piston rings. Oil Control, Compression and Oil Scraper.
Where should piston ring gaps be installed Compression ring gaps should be staggered so that they do not align. This prevents
relative to each other, and why? excessive blow-by.
Excessive oil consumption.
What could result from incorrectly installed
piston rings?
What purpose do oil control rings serve? They regulate the thickness of the oil film on the cylinder walls.
What is used to help prevent valve surge or Two or more springs are used on each valve.
floating in an aircraft engine?
Zero.
On engines equipped with hydraulic valve
lifters, what should the running valve
clearance be?
What is the purpose of valve overlap? It allows better volumetric efficiency and lowers cylinder operating temperatures.
---------------------------------------------------------
Chapter 2- Reciprocating Engine Operation,
Instruments, Maintenance, and Overhaul. ---
----------------------------
The engine will not idle properly.
What indication are given in the event of a
leaking or open primer while the engine is
running?
No combustion in that cylinder.
A cold cylinder is found when
troubleshooting a running engine. What
does this indicate?
A compression check should be performed to identify the faulty cylinder.
When pulling a propeller through, a hissing
sound is heard, indicating valve blow-by.
What procedure should be performed next?
What is the purpose of performing a To determine if the valves, pistons and rings are sealing properly.
compression test?
The total time on the engine must be continued and the time since major overhaul is
When an engine is overhauled, how is its entered into the engine log. If the manufacturer rebuilds the engine, it is granted a
total time affected? When an engine is zero-time status and is considered to have no previous operating history.
rebuilt, how is its operating history affected?
, 1- Inspect engine mounts, the crankcase, and the nose section for damage. 2- Inspect
What inspections should be performed after the oil and oil filters/ screens for metal particles. 3- Inspect the crankshaft or driveshaft
a propeller strike without sudden stoppage? for cranks and misalignment.
Name some of the precautions that should Disconnect the battery, turn off the fuel valves, chock the wheels, and if necessary,
be performed prior to engine removal. install a tail stand.
When inspecting a piston, where are cracks In those areas that are highly stressed; usually the base of the piston bosses, inside at
most likely to be found? the junction of the bore and the walls, and the ring lands.
What does it mean if an engine part is within It means that the part is within the manufacturer's limits and can be used in an engine.
Does not require replacement.
serviceable limits?
A dial indicator or an inside micrometer is usually used to measure the top of the
What tools or instruments are used to cylinder and at the skirt. A telescopic gauge and micrometer can also be used. Two
inspect a cylinder barrel for out-of- reading should be taken 90# to each other.
roundness?
How can a loose stud in an engine Remove the loose stud and inspect the hole for size and thread condition. It may be
crankcase be repaired? necessary to use an oversize stud or Heli-Coil insert.
Manufacture's maintenance manual.
What publication is used to check an engine
for normal operation?
Pressure is transmitted equally in all directions.
A Weak Cylinder is found during a
compression check. What must be
inspected?
Metal particles in the oil show normal and abnormal wear of the engine. This helps in
What purpose does an oil analysis serve? evaluating the engine's internal condition.
Perform an inspection to determine if there is any corrosion damage.
What inspection should be performed on an
engine that has been in storage?
In the ram air intake duct.
Where would a carburetor air temperature
bulb be located?
What is the fuel pressure range on float-type 3 to 5 PSI.
carburetors?
The transmitter and the indicator.
Name the basic components of a fuel
system.
Pounds or gallons per hour.
What unit of measure is generally used to
indicate fuel flow?
Why is fuel flow monitored? To determine fuel consumption and engine performance.
It measures the absolute pressure in the engine manifold and is calibrated in inches of
What does the manifold gauge indicate and
mercury.
how is it calibrated?
What directly control manifold pressure? Throttle opening and engine r. p. m.
Low pitch, high r. p. m.
During engine operation, where should the
propeller control be set when checking the
manifold pressure?
