Glossary “positive valve rotators” Definition:
Devices that turn the valves approximately 3¡ã per valve lift to equalize wear on the valve and seat.
Glossary “positive wheel slip” Definition:
Excessive wheel spin that occurs during acceleration as a wheel loses traction and spins on the pavement.
Glossary “positive wiping seal” Definition:
Seal that maintains constant contact with a stem or shaft to wipe off excess oil.
Glossary “positive terminal” Definition:
Terminal to which electrons flow in a complete electrical circuit often identified by the symbol +.
Glossary “positive traction” Definition:
A limited-slip differential.
Glossary “positive pressure test” Definition:
Part of the fit test. Performed by covering up the exhalation valve and exhaling. A proper fit is evident if the face piece billows out without air escaping from the mask.
Glossary “positive spark plug electrode” Definition:
The end of the conductor.
Glossary “positive stop” Definition:
An automatic adjustment feature used with hydraulic valve lifters.
Glossary “positive crankcase ventilation (PCV)” Definition:
An engine emissions-control system, operating on engine vacuum, that picks up crankcase gases and meters them into the intake stream to be burned.
Glossary “positive engagement starter” Definition:
Ford type of starter motor that uses the magneticfield strength of a field winding to engage the starter drive into the flywheel ring-gear
Glossary “positive offset” Definition:
A wheel rim placed outward of the center of the mounting flange.
Glossary “positive pole” Definition:
1). The positive terminal of an electrical device. 2). The north pole of a magnet.
Glossary “positive post” Definition:
Positive terminal of a battery.
Glossary “positive caster” Definition:
The rearward tilt of the steering axis, when viewed from the top.
Glossary “positive absolute-suction throttling valve” Definition:
A suction throttling valve having bronze bellows under a nearly perfect vacuum, which is not affected by atmospheric pressure.
Glossary “positive” Definition:
1). One of the two poles of a magnet. 2). One of the two terminals of an electrical device, such as a battery. 3). A pressure greater than atmospheric.
Glossary “positive back-pressure EGR valve” Definition:
A common type of exhaust gas recirculation valve which uses exhaust system backpressure to sense engine load, thus more accurately metering the amount of EGR flow.
Glossary “positive camber” Definition:
The outward tilt of a wheel on a vehicle.