Glossary “parts per million (ppm)” Definition:
1). Unit used to measure the amount of contamination in a substance, such as moisture in refrigerant. 2). Measurement of the emissions of a motor vehicle given as the number of parts of a particular chemical within one million parts of exhaust gas.
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parts requisition
Glossary “parts requisition” Definition:
orm that is used to order parts.
parts specialist
Glossary “parts specialist” Definition:
One who sells automotive engine and vehicle parts.
parts washer
Glossary “parts washer” Definition:
Machine that is used to clean parts.
parts chaser
Glossary “parts chaser” Definition:
1). Vehicle used for errands. 2). Person who runs errands, especially for delivering parts.
parts counterman
Glossary “parts counterman” Definition:
Knowledgeable in part numbers, and/or determining requirements who generally works in a parts supply wholesale or retail outlet.
parts distribution
Glossary “parts distribution” Definition:
A wholesale, discount, or retail establishment that sells parts to the trade or do-it-yourselfer.
parts changer
Glossary “parts changer” Definition:
One who, without proper diagnostic skills, randomly changes parts until the remedy to a problem is found.
parting edge
Glossary “parting edge” Definition:
Excess flash material that is found around the edge of a part that has been cast in a two-piece mold.
parting face
Glossary “parting face” Definition:
Meeting points of the two halves of split plain bearings, such as main and connecting rod bearings.
partition coefficient
Glossary “partition coefficient” Definition:
Ratio of the solubility of a chemical in water as compared to its solubility in oil.
partitions
Glossary “partitions” Definition:
Separations between the cells of a battery.
particle respirator
Glossary “particle respirator” Definition:
See dust respirator
particulate
Glossary “particulate” Definition:
1). A solid matter, mainly soot from burned carbon, in an internal combustion engine’s exhaust. 2). Form of solid air pollution such as microscopic solid or liquid matter that floats in the air.
particulate emissions
Glossary “particulate emissions” Definition:
Solid particles, such as carbon and lead, found in vehicle exhaust soot. A problem, especially in diesels.
particulate trap
Glossary “particulate trap” Definition:
Emission control device in the exhaust system of a diesel engine which is used to capture particulate before they can enter the atmosphere.
particulates
Glossary “particulates” Definition:
Liquid or solid particles such as carbon that are given off by an internal combustion engine as pollution.
partial non-hunting gear set
Glossary “partial non-hunting gear set” Definition:
When one pinion tooth contact two or three different ring gear teeth during one revolution and two or three different one the next reloution.
particle
Glossary “particle” Definition:
Very small piece of dirt, metal or other debris which can be contained in oil, air, or fuel that can be removed with a filter.
part number (PN)
Glossary “part number (PN)” Definition:
Alphanumeric designating a part as listed in a catalog or parts list.