DRIVE HOUSINGCase surrounding the pinion
gear on the starter motor.
DRIVE LINEThe parts that transfer power from the
transmission to the drive wheels.
DRIVE SHAFTSteel tube that transfers rotating
motion from the transmission to the rear wheel of
DRIVE SHAFT ANGLEThe angle at which the
drive line meets the differential or transmission.
D R I V E S H A F T A S S E M B L YComponents
between the transmission and differential,
including front and rear yokes, universal joints,
and a drive shaft.
DRIVE SHAFT BALANCEEqual
distribution around the axis of the shaft.
DRIVE SHAFT NOISESounds typically caused
by worn U-joints, worn slip joints, or a faulty
center support bearing.
DRIVE SHAFT RUNOUTLack of straightness
due to being bent or because of U-joint wear.
DRIVE SHAFT VIBRATIONA rapid oscillation
caused by a shaft imbalance or excessive shaft
DRIVING HUBMounting for the wheel on the end
of the axle.
DRUMThe housing that holds the parts of a clutch
assembly for an automatic transmission.
DRUM BRAKESSystem that forces brake shoes
against the inside of a rotating drum to stop a
DRUM BRAKE SERVICEProcess that involves
dismounting, disassembling, cleaning, and
replacing parts as necessary. Usually, shoes are
replaced, wheel cylinders are replaced or rebuilt,
and the drum is turned. System is then
reassembled, bled, and tested.
DRUM GRINDINGA process done to remove hard
spots on a brake drum.
DRUM MAXIMUM DIAMETERLargest inside
diameter allowed for safe operation of drum
DRY CHARGEDBattery is filled with electrolyte
just before being installed in a vehicle.
DUAL MASTER CYLINDERBrake system pump
with two pistons and fluid reservoirs for safety.
ELECTROLYTELiquid that surrounds the plates
of a battery and allows a free flow of electrons.
ELECTRONIC ADVANCEA system that uses
sensor input and the computer of the vehicle to
control spark timing.
ELECTRONIC IGNITION SYSTEMOne
uses an electronic control circuit and distributor
ELECTRONIC IGNITION TESTERInstrument
use to identify source of ignition problems.
ELECTRONIC MODULESSmall computers in a
vehicle, used for specific systems (such as anti-
E L E C T R O N I C R E G U L A T O RSolid-state
regulator separate from the alternator.
ELEMENTOne of the cells that can be combined to
form a battery.
applying the rear brakes.
bolted to the transmission housing, containing the
output shaft and rear oil seal.
FACEArea of a gear tooth above the pitch line.
FAST CHARGEROne that provides a high current
flow for quickly recharging a battery.
FIELD FRAMEHousing on a motor that holds the
FIXED CALIPERBrake caliper rigidly mounted to
the steering knuckle.
FLOATING CALIPERBrake caliper mounted on
two rubber bushings, allowing some movement.
FORWARD BIASArrangement in which a diode
acts as a conductor.
DWELLThe amount of time distributor points
remain closed between openings.
DWELL METEROne that measures point setting
in degrees of distributor rotation.
causes both up-and-down and side-to-side
movement while rotating.
ECMElectronic control module, another name for
an automotive computer.
ECUElectronic control unit, another name for an