Glossary “proportioning valve” Definition:
Valve in the brake hydraulic system that reduces pressure to the rear wheels to achieve better brake balance.
p
Propylene Glycol Antifreeze
Glossary “Propylene Glycol Antifreeze” Definition:
A Low Tox antifreeze made form Propylene rather than Ethylene. While no antifreeze product is compleetly harmless, using propylene glycol antifreeze does provide an added margin of safety in the event of accidental ingestion.
protective atmosphere
Glossary “protective atmosphere” Definition:
A gas or vacuum envelope surrounding the work pieces, used to prevent or reduce the formation of oxides and other detrimental surface substances, and to facilitate their removal.
protective tube
Glossary “protective tube” Definition:
Shock absorber component used to keep dirt and road dust away from the seals and piston rods.
proof loading
Glossary “proof loading” Definition:
Subjecting chain to a tensile loading of some predetermined percentage of the chain’s rating strength.
propane
Glossary “propane” Definition:
Combustible, liquefied petroleum gas (C3H8) that becomes a liquid when compressed.
propane enrichment
Glossary “propane enrichment” Definition:
Service procedure used to set idle mixture where a metered amount of propane gas is added to the intake stream and a resulting rpm increase is observed.
propeller shaft
Glossary “propeller shaft” Definition:
1). Term used for drive shaft. 2). A hollow, steel shaft that connects the transmission output shaft to the differential drive pinion yoke through universal joints at each shaft end. May be constructed of other types of material.
prony brake
Glossary “prony brake” Definition:
Machine for testing the power of an engine while running against a friction brake.
progressive linkage
Glossary “progressive linkage” Definition:
Carburetor linkage system used on multiple carburetors to progressively open the secondary circuits.
progressive rate spring
Glossary “progressive rate spring” Definition:
Spring used in a vehicles suspension system that stiffens under load.
PROM
Glossary “PROM” Definition:
Programmable Read Only Memory.
Program for Alternative Fluorocarbon Toxicity (PAFT) Testing
Glossary “Program for Alternative Fluorocarbon Toxicity (PAFT) Testing” Definition:
Testing agency founded by refrigerant manufacturers for the purpose of study and testing of new refrigerants to determine toxicity levels.
programmable read only memory (PROM)
Glossary “programmable read only memory (PROM)” Definition:
A read-only memory chip that can be programmed by electrical pulses to store the computer program and other data.
programmed combustion (PROCO)
Glossary “programmed combustion (PROCO)” Definition:
A research type of stratified charge engine developed by Ford.
programmer
Glossary “programmer” Definition:
Part of an ATC system that controls the blower speed, air blend doors, and vacuum diaphragms.
profile
Glossary “profile” Definition:
Term used for aspect ration and tire profile.
profile ignition pickup (PIP)
Glossary “profile ignition pickup (PIP)” Definition:
A hall effect vane switch sensor that provides crankshaft position information to the processor, used for ignition timing.
program
Glossary “program” Definition:
1). The job instructions for a computer. 2). An organized list of instructions that, when executed, causes the computer to behave in a predetermined manner. Without programs computers are useless.
professional
Glossary “professional” Definition:
Refers to attitude, work quality and the image that a business and its workers project to its customers.