Saturday, 20 April 2024, 5:59 AM
Site: IMI eLearning
Course: IMI eLearning (IMI eLearning)
Glossary: Automotive Glossary
P
PicklingThe use of a chemical solution (usually acidic) to prepare a surface for painting or bonding by dissolving away surface oxides and other impurities. |
PIDParameter ID |
Piezo-resistiveA special crystal that changes resistance as pressure is applied. |
PiezoelectricVoltage produced by shock waves on a piezo crystal. Used in engine knock sensors. |
PigmentSmall particles added to paint to influence properties such as colour, corrosion resistance, mechanical strength, etc. Pigments may be coloured, semi-transparent, black, white, or colourless. They must be incorporated into a paint system by very efficient dispersion processes. |
Pilot BearingSmall bearing usually where two shafts meet. See also Spigot. |
PingingNoise heard from an engine when the ignition of fuel occurs too early (advanced) in the cycle. Also 'ping'. |
PinholingA defect consisting of tiny holes in the dried paint surface. Defects such as pin holing, popping, bubbling, and cratering are usually caused by solvent vapours forming from the substrate or the paint and rising to the surface. |
PinionA small gear wheel or the driver of a meshing pair of gear wheels. |
Pinion GearA small gear wheel or the driver of a meshing pair of gear wheels. |