Glossary “directional rotors” Definition:
Brake rotors that are designed to rotate in one direction to maximimize there cooling ability because of the design of the internal cooling fins.
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directional signals
Glossary “directional signals” Definition:
Lights at either side of both the front and rear of the vehicle that flash to indicate an intended turn.
directional stability
Glossary “directional stability” Definition:
Ability to maintain a straight line while stopping.
direct ignition system
Glossary “direct ignition system” Definition:
Ignition system where impulses are sent directly to the spark plugs by a modulator.
direct injection
Glossary “direct injection” Definition:
Type of fuel-injection system that injects fuel directly into the cylinders.
direct clutch solenoid
Glossary “direct clutch solenoid” Definition:
Solenoid that directs fluid flow to engage the direct clutch in an A/T..
direct current (DC)
Glossary “direct current (DC)” Definition:
Current flow in one direction only such as the current produced by a battery.
direct drive
Glossary “direct drive” Definition:
A transmission mode in which the driveshaft and engine crankshaft are at the same speed.
Direct Fuel Cell
Glossary “Direct Fuel Cell” Definition:
A type of fuel cell in which a hydrocarbon fuel is fed directly to the fuel cell stack without requring an external “reformer” to generate hydrogen.
dipper
Glossary “dipper” Definition:
A small, metal scoop at the bottom of a connecting rod to scoop up oil from the pan to lubricate the bearing.
dipper trough
Glossary “dipper trough” Definition:
A trough aligned under the connecting rod that is fitted with the dipper.
direct acting shock absorber
Glossary “direct acting shock absorber” Definition:
A double-action design controlling up and down suspension travel; it is mounted directly between the frame of the vehicle and the control arm or axle.
direct acting thermostatic air cleaner
Glossary “direct acting thermostatic air cleaner” Definition:
Component of the heated air-intake systems that uses a thermostatic bulb connected to a rod to operate a flapper valve in the air-cleaner snorkel.
direct battery power
Glossary “direct battery power” Definition:
Power available to a circuit in the automobile directly from the battery, without an intermediate switch.
direct bonded bearing
Glossary “direct bonded bearing” Definition:
A bearing that is formed by pouring molten babbitt directly into the bearing housing and machining the cooled metal to the desired diameter.
diode
Glossary “diode” Definition:
An electrical one-way check valve made by joining P-material to N-material at a junction
diode trio
Glossary “diode trio” Definition:
A group of three diodes grouped together with one output used to provide rectified current to the field and voltage regulator on many internally regulated alternators
diolefins
Glossary “diolefins” Definition:
An ingredient of gasoline which contribute to gum and lacquer formation in the fuel system.
dip stick
Glossary “dip stick” Definition:
A thin, steel strip of metal used to measure the fluid level or quantity in the engine, transmission, or compressor.
dimple
Glossary “dimple” Definition:
The process of turning a hole under or down to allow the installation of a fastener.