Glossary “dry disk clutch” Definition:
Clutch in which the friction faces of the friction disk are dry.
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dry film lubricant
Glossary “dry film lubricant” Definition:
Petroleum based chemical used to lubricate operating parts during assembly, prior to engine start up, to provide lubrication until oil is circulated after start up.
dry friction
Glossary “dry friction” Definition:
The friction between two dry solids.
dry deck
Glossary “dry deck” Definition:
Condition in which the piston crown is at the level of the block deck.
drum maximum diameter
Glossary “drum maximum diameter” Definition:
The largest diameter, generally 0.060 inch (1.5 mm) over originally to which a brake drum can be machined or worn before it is considered unsafe.
drum web
Glossary “drum web” Definition:
Closed side of a brake drum.
dry
Glossary “dry” Definition:
1). The process of changing from a liquid to a solid, as in paint. 2). The process of evaporation, as in water.
dry charged battery
Glossary “dry charged battery” Definition:
Battery that is filled with electrolyte only when put into service.
dry compression test
Glossary “dry compression test” Definition:
A test to determine engine compression. After the engine has reached operating temperature, remove all spark plugs, disable fuel and ignition systems, prop open the throttle, install the compression tester into the spark plug hole. Crank the engine at least five compression strokes and record the reading. Repeat these step for the remaining cylinders. Compression readings are considered to be within specification if the lowest reading is within 75% of the highest reading. When performed on a diesel engine, use a compression gauge designed for diesel engines.. Compression gauge is attached through the glow plug hole.
drum brake fade
Glossary “drum brake fade” Definition:
Loss of braking efficience due to excessive heat.
dropping resistor
Glossary “dropping resistor” Definition:
Resistor inserted in series with a line to reduce the voltage to a desired level.
DRS
Glossary “DRS” Definition:
Distance Rpm Sensor, or Distributor Retard Solenoid
drum
Glossary “drum” Definition:
The part of a brake that rotates with the axle hub and that the brake shoes press against to slow or stop the vehicle.
drum armature
Glossary “drum armature” Definition:
A generator or motor armature having its coils wound longitudinally or parallel to its axis.
drum brake
Glossary “drum brake” Definition:
A type of brake in which stopping friction is created by shoes pressing against the inside of the rotating drum.
drop center wheel
Glossary “drop center wheel” Definition:
A conventional wheel that has a space in the center for one bead to fit into while the other bead is being lifted over the rim flange.
drop forged
Glossary “drop forged” Definition:
A piece of steel shaped between two dies when hot.
drop through
Glossary “drop through” Definition:
The undesirable sagging or surface irregularity encountered when brazing or welding; caused by overheating with rapid diffusion between the filler metal and the base metal.
droplight
Glossary “droplight” Definition:
An electrical light on a long extension cord. Also called a trouble light, or repair light.
dropping point
Glossary “dropping point” Definition:
Temperature at which grease turns into a liquid.