Continental Refrigerator IO-240-A, Installation And Operation Manual

Page: 113 / 146

IO-240 Series Engine Installation & Operation Manual A-3
31 October 2011
Glossary
Dynamic Seal Vital seal in the engine cylinder that consists of valve-to-valve seat seals,
spark plug-to-spark plug port seals, and cylinder head-to-barrel seal.
Elongate To stretch out or lengthen.
Erosion Wearing away of material due to flow, hot gases, grit, or chemicals.
Fretting Surface erosion caused by slight movement between two parts that are
fastened together.
Galling Severe chafing or fretting that results in transfer of metal from one part to
another; usually caused by slight movement of mated parts that have
limited relative motion and are under heavy loads.
Grooved Surface Shallow channels, wider than scratches and usually smooth resulting
from wear affected by concentrated contact stress.
Hydraulic Lock Condition where fluid accumulates in the induction system or the cylinder
assembly. The liquid restricts the piston from traveling during the
compression stroke. Damage to the engine occurs when the other
cylinders fire, which forces the piston in the fluid-filled cylinder through
the compression stroke. Damage to an engine from hydraulic lock can be
extensive due to the extreme stress load and can adversely affect
connecting rods, pistons, cylinder assemblies, piston pins, the
crankcase, and the crankshaft.
Mandatory Service Bulletin Service document relating to known or suspected hazards to safety that
have been incorporated in whole or in part into an Airworthiness Directive
(AD) issued by the FAA, or have been issued at the direction of the FAA
by the manufacturer requiring compliance with an already-issued AD (or
an equivalent issued by another country’s airworthiness authority).
Nick Sharp-sided gouge or depression with a V-shaped bottom.
Peening Series of blunt depressions in a surface.
Pitting Formation of pockets of corrosion products on the surface of a metal.
Propeller Strike Any incident that requires repair (other than minor dressing of the blade)
to a propeller blade. Either the propeller strikes an object or an object
strikes the propeller and causing a propeller imbalance. Propeller strikes
are serious because they can result in engine failure. Even if the
propeller still continues to rotate, other components critical to engine
operation may be damaged.
Runout Eccentricity or wobble of a rotating part; eccentricity of two bored holes or
two shaft diameters; a hole or bushing out of square with a flat surface.
Runout is usually measured with a dial indicator, and limits stated
indicate full deflection of indicator needle in one revolution of part or
indicator support.
Scoring Deep grooves in a surface caused by abrasion from fine hard particles
wedged between moving surfaces, as in a bearing and journal, or caused
by galling when a moving part is not supplied with lubricant.
Term Definition