1989 FORD FIESTA brake rotor

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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1595 Ford Fiesta Remake
Glossary of technical termsREF•25
REF
JJump startStarting the engine of a vehicle
with a discharged or weak battery by
attaching jump leads from the weak battery to
a charged or helper battery.
LLoad Sensing Proportioning Valve (LSPV) A
brake hydraulic system control valve that
works like a proportioning valve, but also
takes into consideration the amount of weight
carried by the rear axle.
Locknut A nut used to lock an adjustment
nut, or other threaded component, in place.
For example, a locknut is employed to keep
the adjusting nut on the rocker arm in
position.
Lockwasher A form of washer designed to
pr event an attaching nut from working loose.
MMacPherson strut A type of front
suspension system devised by Earle
MacPherson at Ford of England. In its original
form, a simple lateral link with the anti-roll bar
cr eates the lower control arm. A long strut - an
integral coil spring and shock absorber - is
mounted between the body and the steering
knuckle. Many modern so-called MacPherson
strut systems use a conventional lower A-arm
and don’t rely on the anti-roll bar for location. Multimeter An electrical test instrument with
the capability to measure voltage, current and
resistance.
NNOx Oxides of Nitrogen. A common toxic
pollutant emitted by petrol and diesel engines
at higher temperatures.
OOhm The unit of electrical resistance. One
volt applied to a resistance of one ohm will
pr oduce a current of one amp.
Ohmmeter An instrument for measuring
electrical resistance.
O-ring A type of sealing ring made of a
special rubber-like material; in use, the O-ring
is compressed into a groove to provide the
sealing action. Overhead cam (ohc) engine
An engine with
the camshaft(s) located on top of the cylinder
head(s).
Overhead valve (ohv) engine An engine with
the valves located in the cylinder head, but
with the camshaft located in the engine block.
Oxygen sensor A device installed in the
engine exhaust manifold, which senses the
oxygen content in the exhaust and converts
this information into an electric current. Also
called a Lambda sensor.
PPhillips screw A type of screw head having a
cr oss instead of a slot for a corresponding
type of screwdriver.
Plastigage A thin strip of plastic thread,
available in different sizes, used for measuring clearances. For example, a strip of Plastigage
is laid across a bearing journal. The parts areassembled and dismantled; the width of the
crushed strip indicates the clearance between
jour nal and bearing.
Pr opeller shaft The long hollow tube with
universal joints at both ends that carries
power from the transmission to the differential on front-engined rear wheel drive vehicles.
Pr oportioning valve A hydraulic control
valve which limits the amount of pressure to
the rear brakes during panic stops to prevent
wheel lock-up.
RRack-and-pinion steering A steering system
with a pinion gear on the end of the steering
shaft that mates with a rack (think of a geared
wheel opened up and laid flat). When the
steering wheel is turned, the pinion turns,
moving the rack to the left or right. This
movement is transmitted through the track
r ods to the steering arms at the wheels.
Radiator A liquid-to-air heat transfer device
designed to reduce the temperature of the
coolant in an internal combustion engine
cooling system.
Refrigerant Any substance used as a heat
transfer agent in an air-conditioning system.
R-12 has been the principle refrigerant for
many years; recently, however, manufacturers
have begun using R-134a, a non-CFC
substance that is considered less harmful to the ozone in the upper atmosphere.
Rocker arm
A lever arm that rocks on a shaft
or pivots on a stud. In an overhead valve
engine, the rocker arm converts the upward
movement of the pushrod into a downward
movement to open a valve.
Rotor In a distributor, the rotating device
inside the cap that connects the centre
electr ode and the outer terminals as it turns,
distributing the high voltage from the coil
secondary winding to the proper spark plug.
Also, that part of an alternator which rotates
inside the stator. Also, the rotating assembly
of a turbocharger, including the compressor
wheel, shaft and turbine wheel.
Runout The amount of wobble (in-and-out
movement) of a gear or wheel as it’ s rotated.
The amount a shaft rotates “out-of-true.” The
out-of-r ound condition of a rotating part.
SSealant A liquid or paste used to prevent
leakage at a joint. Sometimes used in
conjunction with a gasket.
Sealed beam lamp An older headlight design
which integrates the reflector, lens and
filaments into a hermetically-sealed one-piece
unit. When a filament burns out or the lens
cracks, the entire unit is simply replaced.
Serpentine drivebelt A single, long, wide
accessory drivebelt that’s used on some
newer vehicles to drive all the accessories,
instead of a series of smaller, shorter belts.
Serpentine drivebelts are usually tensioned by
an automatic tensioner.
Shim Thin spacer, commonly used to adjust
the clearance or relative positions between
two parts. For example, shims inserted into or
under bucket tappets control valve
clearances. Clearance is adjusted by
changing the thickness of the shim.
Slide hammer A special puller that screws
into or hooks onto a component such as a
shaft or bearing; a heavy sliding handle on the
shaft bottoms against the end of the shaft to
knock the component free.
Sprocket A tooth or projection on the
periphery of a wheel, shaped to engage with a
chain or drivebelt. Commonly used to refer to
the sprocket wheel itself.
Starter inhibitor switch On vehicles with an
O-ring
Serpentine drivebelt
Plastigage
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