1595 Ford Fiesta Remake
REF•24Glossary of technical terms
EEGR valveA valve used to introduce exhaust
gases into the intake air stream.
Electr onic control unit (ECU) A computer
which controls (for instance) ignition and fuel
injection systems, or an anti-lock braking
system. For more information refer to the
Haynes Automotive Electrical and Electronic
Systems Manual.
Electr onic Fuel Injection (EFI) A computer
contr olled fuel system that distributes fuel
thr ough an injector located in each intake port
of the engine.
Emergency brake A braking system,
independent of the main hydraulic system,
that can be used to slow or stop the vehicle if
the primary brakes fail, or to hold the vehicle
stationary even though the brake pedal isn’t
depr essed. It usually consists of a hand lever
that actuates either front or rear brakes
mechanically through a series of cables and
linkages. Also known as a handbrake or
parking brake.
Endfloat The amount of lengthwise
movement between two parts. As applied to a
crankshaft, the distance that the crankshaft
can move forward and back in the cylinder
block.
Engine management system (EMS) A
computer controlled system which manages
the fuel injection and the ignition systems in
an integrated fashion.
Exhaust manifold A part with several
passages through which exhaust gases leave
the engine combustion chambers and enter
the exhaust pipe.
FFan clutch A viscous (fluid) drive coupling
device which permits variable engine fan
speeds in relation to engine speeds. Feeler blade
A thin strip or blade of hardened
steel, ground to an exact thickness, used to
check or measure clearances between parts.
Firing order The order in which the engine
cylinders fire, or deliver their power strokes,
beginning with the number one cylinder.
Flywheel A heavy spinning wheel in which
ener gy is absorbed and stored by means of
momentum. On cars, the flywheel is attached
to the crankshaft to smooth out firing
impulses.
Fr ee play The amount of travel before any
action takes place. The “looseness” in a
linkage, or an assembly of parts, between the
initial application of force and actual
movement. For example, the distance the
brake pedal moves before the pistons in the
master cylinder are actuated.
Fuse An electrical device which protects a
cir cuit against accidental overload. The typical
fuse contains a soft piece of metal which is
calibrated to melt at a predetermined current
flow (expressed as amps) and break the
circuit.
Fusible link A circuit protection device
consisting of a conductor surrounded by
heat-r esistant insulation. The conductor is
smaller than the wire it protects, so it acts as
the weakest link in the circuit. Unlike a blown
fuse, a failed fusible link must frequently be
cut from the wire for replacement.
GGap The distance the spark must travel in
jumping from the centre electrode to the side electr
ode in a spark plug. Also refers to the
spacing between the points in a contact
br eaker assembly in a conventional points-
type ignition, or to the distance between the
r eluctor or rotor and the pickup coil in an
electr onic ignition.
Gasket Any thin, soft material - usually cork,
cardboar d, asbestos or soft metal - installed
between two metal surfaces to ensure a good
seal. For instance, the cylinder head gasket
seals the joint between the block and the
cylinder head.
Gauge An instrument panel display used to
monitor engine conditions. A gauge with a
movable pointer on a dial or a fixed scale is an
analogue gauge. A gauge with a numerical
r eadout is called a digital gauge.
HHalfshaft A rotating shaft that transmits
power from the final drive unit to a drive
wheel, usually when referring to a live rear axle.
Harmonic balancer A device designed to
r educe torsion or twisting vibration in the
crankshaft. May be incorporated in the
crankshaft pulley. Also known as a vibration
damper.
Hone An abrasive tool for correcting small
irr egularities or differences in diameter in an
engine cylinder, brake cylinder, etc.
Hydraulic tappet A tappet that utilises
hydraulic pressure from the engine’s
lubrication system to maintain zero clearance
(constant contact with both camshaft and
valve stem). Automatically adjusts to variation
in valve stem length. Hydraulic tappets also
r educe valve noise.
IIgnition timing The moment at which the
spark plug fires, usually expressed in the number of crankshaft degrees before the
piston reaches the top of its stroke.
Inlet manifold A tube or housing with
passages through which flows the air-fuel mixtur e (carburettor vehicles and vehicles with
thr ottle body injection) or air only (port fuel-
injected vehicles) to the port openings in the
cylinder head.
Exhaust manifold
Feeler blade
Adjusting spark plug gap
Gasket
EGR valve
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