Reciprocating Engine Overhaul Flashcards
Process in which the valves, pistons, and cylinders are overhauled, but crankcase is not opened.
Top overhaul
6 steps of a major overhaul
Disassembly, Cleaning, Inspection, Repair, Reassembly, Testing.
Compliance with_____ and _____ must be checked during overhauls.
Airworthiness directives,
Sevice directives.
Manufacturer’s recommended maximum time period that an aircraft engine should run before being overhauled.
TBO
Time between overhauls
T/F
When a TBO is reached, the engine must receive a major overhaul.
False
TBO is only a recommendation.
After starting an engine, watch for an indication of ______.
Oil pressure
T/F
If there is no indication of oil pressure after 30 seconds the engine should be shut down.
True
Aircraft operating instructions are found in the ______.
POH
Pilot’s operating handbook
Moving the mixture control to the forward limit is called _____.
Full Rich.
7 parts that are routinely replaced during an overhaul include:
Gaskets, Oil seals, Bearing inserts, Stressed nuts and bolts, Exhaust valves, Piston rings, Ignition cables.
T/F
Longitudinal magnetism is intended to detect faults that extend lengthwise through the part.
False
Circular magnetism
A measure of the amount a shaft, flange or disc is bent or fails to run true.
Runout
T/F
A top overhaul may be used to extend the TBO of an engine.
False
T/F
After completing a major overhaul, the engine operating time is set back to zero.
False
T/F
An engine that is rebuilt by the manufaturer or a manufacturer approved agency has zero hours of operating time.
True
T/F
All usable parts of an engine are kept together and assembled in a rebuilt engine.
False
Overhauled engines only
T/F
Carburetors, magnetos and spark plugs are normally installed on an engine when it is sent to an overhaul facility.
True
Piston ring grooves may be cleaned with a _____.
Cotton string
The two most widely used types of nondestructive inspection are _____ and _____.
Magnetic particle inspection.
Fluorescent penetrant inspection.
Two types of mag particle inspection are ____ and ____.
Continuous.
Residual.
_____ detects faults that extend lengthwise through the part
Circular magnetism
_____ detects faults that extend across the part
Longitudinal magnetism
T/F
Magnetic particle inspection can detect SUBSURFACE faults.
True
T/F
For a fluorescent penetrant inspection to detect a fault, the fault must extend to the surface.
True
T/F
Abrasive blasting should not be used before fluorescent penetrant inspection.
True
Cylinder bore is measured with a _____ or an outside micrometer with a _____.
Inside micrometer caliper.
Telescoping gauge.
If a part is larger than the hole into which it is to be installed, the fit is called an _______.
Interference fit.
Three important piston ring measurements:
End gap.
Side clearance.
Tension.
Damaged stud holes can be repaired by installing ______.
Heli-Coil
Bearing journals on a crankshaft are hardened by ______.
Nitriding.
Cylinder heads are inspected for cracks by ______.
Fluorescent penetrant.
Valve guides and valve seats are installed with an _______.
Interference fit.
Two methods for making cylinder walls hard and wear resistant:
Nitriding. (Blue paint)
Chrome plating. (Orange paint)
Yellow paint on the cylinder fins between spark plug and rocker box means:
Long-reach spark plugs required.
Intake valves are ground to an angle of _______ degrees relative to the plane of the seat.
30 degrees
Exhaust valves are ground to an angle of ______ relative to the plane of the seat.
45 degrees
A feathered edge on a valve face can become so hot that it can cause ______.
Preignition.
T/F
Valve seats are ground so that their angle is 0.5 to 1 degree less that the angle of the valve face
False.
Greater than 0.5 - 1 degree.
Full forward position on the mixture control is called ______.
Full Rich
Full forward position of the propeller pitch control is called:
Low pitch (high rpm)
