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Pikes Peak

A 14,110 foot (4,300 meters) high mountain peak in central Colorado where an annual auto-racing hill climb is held around the Fourth of July.

Pilot

1. A driver. 2. A device that guides the operation of a machine or part.

Pilot Bearing

The bearing at the output end of the engine's crankshaft that supports the transmissions input shaft.

Pilot Hole

A small hole drilled into a part to serve as a guide for a larger sized drill bit.

Pilot Model

The first vehicle of a new design to be constructed on the assembly line to test the assembly procedures and fixtures before full-scale production begins.

Pilot Operated

A small valve used to energize or regulate a large valve.

Pilot Shaft

A shaft that is used to align parts during assembly.

Pilot-operated Absolute (POA)

A term used for pilot-operated evaporator pressure regulator.

Pilot-operated Evaporator Pressure Regulator (POEPR)

An evaporator pressure regulated valve that is regulated by an internal pilot-valve pressure.

PIN

[1] An acronym for product identification number. [2] A threaded tapered metal part used to repair cracks in castings such as an engine block using a process called pinning.

Ping

A mild knock noise from the engine.

Pinion

1. A small gear such as at the end of the steering shaft of a rack-and-pinion steering system. 2. A small ring gear such as the planet gears in a planetary gear set. 3. The small gear on the end of a starter drive which rotates the engine flywheel ring gear for starting.

Pinion Bearing

A bearing that is used to support the pinion gear in the differential housing.

Pinion Factor

A calculation using the final drive ratio and the tire circumference to obtain accurate vehicle speed signals.

Pinion Gears

A term used for pinion.

Pinion Seal

An oil seal for the pinion gear in a ring and pinion.

Pinion Shaft

A shaft used to support a pinion bearing and/or pinion.

Pink Slip

A vehicle ownership certificate.

Pinning

Using a series of pins to repair and crack in the casting by screwing them into a series of predrilled holes in a manner so that they overlap each other from one end of the crack to the other.

Pintle

[1] A valve-like part of a fuel injector that controls the fuel-spray pattern. [2] A valve that controlles the flow of any liquid or gas.