RECIPROCATING ENGINE OPERATION

Question 1

what indications are given in the event of a leaking or open primer while the engine is running

Answer 1

the engine will not idle properly

Question 2

a cold cylinder is found when troubleshooting a running engine what does this indicate

Answer 2

no combustion in that cylinder

Question 3

when pulling a propeller through a hissing sound is heard indicating valve blow by what procedure should be performed next

Answer 3

a compression check should be performed to identify the faulty cylinder

Question 4

what is the purpose of performing a compression test

Answer 4

to determine if the valves piston and rings are sealing properly

Question 5

when an engine is overhauled how is its total time affected when an engine is rebuilt how was its operating history affected

Answer 5

the total time on the engine must be continued and the time since major overhaul is entered in the engine logbook if the manufacturer rebuilds the engine it is granted a zero time status and is to be considered to have no previous operating history

Question 6

what inspections should be performed after a propeller strike without sudden stoppage

Answer 6

inspect engine mounts, the crankcase and the nose section for damage. inspect the oil and oil filters slash screens for metal particles. inspect the crankshaft or driveshaft for cracks and misalignment

Question 7

name some of the precautions that should be performed prior to engine removal

Answer 7

disconnect the battery turn off the fuel valves chock the wheels and if necessary install a tail stand

Question 8

when inspecting a piston where are cracks most likely to be found

Answer 8

in those areas that are highly stressed usually the base of the piston bosses inside the junction of the bore and the walls and the ring glands

Question 9

what does it mean if an engine part is within serviceable limits

Answer 9

it means that the part is within the manufacturer’s limits and can be used in an engine it does not require a replacement

Question 10

what tools or instruments are used to inspect a cylinder barrel for out of roundness

Answer 10

a dial indicator or an inside micrometer is usually used to measure the top of the cylinder at the skirt a telescopic gauge and micrometer can also be used two readings should be taken 90 degrees to each other

Question 11

how can a loose stud in an engine crank case be repaired

Answer 11

remove the loose stud and inspect the hole for size and thread condition it may be necessary to use an oversized stud or helicoil insert

Question 12

what publications is used to check an engine for normal operation

Answer 12

the manufacturer’s maintenance manual

Question 13

a weak cylinder is found during a compression check what must be inspected

Answer 13

pressure is transmitted equally in all directions

Question 14

what purpose does an oil analysis serve

Answer 14

metal particles in the oil show normal and abnormal wear of the engine this helps in evaluating the engine’s internal condition

Question 15

what inspections should be performed on an engine that has been in storage

Answer 15

perform an inspection to determine if there is any corrosion damage

Question 16

where would a carburetor air temperature bulbs be located

Answer 16

in the ram air intake duct

Question 17

what is the fuel pressure range on a float type carburetor

Answer 17

3 to 5 psi

Question 18

name the basic components of a fuel indicator system

Answer 18

the transmitter and the indicator

Question 19

what unit of measure is generally used to indicate fuel flow

Answer 19

pounds or gallons per hour

Question 20

why is fuel flow monitored

Answer 20

to determine the fuel consumption and engine performance

Question 21

what does the manifold gauge indicate and how was it calibrated

Answer 21

it measures the absolute pressure in the engine manifold and is calibrated in inches of mercury

Question 22

what directly controls manifold pressure

Answer 22

throttle opening and engine rpm during engine operation

Question 23

where should the propeller control be set when checking the manifold pressure

Answer 23

low pitch high rpm

Question 24

is the aircraft electrical system required to power a cylinder head temperature gauge

Answer 24

no a thermocouple is used as the electrical source

Question 25

what are the possible indications of an oil pressure transmitter or indicator malfunction

Answer 25

a severe or sudden drop in oil pressure while the oil temperature remains normal and the oil supply remains full

Question 26

what does a tachometer indicate in a reciprocating engine

Answer 26

tachometer indicates engine rpm

Question 27

where should the thermocouple be installed on a reciprocating engine using a single probe cylinder head temperature system

Answer 27

on the hottest cylinder