DICTIONARY OF AUTOMOTIVE TERMS - "On"

ON:

See octane number

On-board computer:

1. An electronic component used to control vehicle electrical circuits, etc. and to process data for instrument panel gauges
2. A cab-mounted device on a truck which electronically or mechanically records data such as truck speed, engine rpm, idle time and other information useful to trucking management. Also called "Trip Recorder"

On board diagnostics:

(OBD) A unit that monitors the Electric Control Unit and system responses for errors during normal vehicle operations. When the vehicle is serviced, this information on the errors can be down loaded and displayed to the service personnel which will facilitate the trouble shooting process.

On-board diagnostic system: (OBD) and (OBDII)

1. An indicating device on the car that alerts the driver when something is wrong in the system
2. A system which monitors some or all computer input and control signals. Signal(s) outside predetermined limits implies a fault in the system or in a related system

On boost:

The condition that exists when a turbocharger is producing power. When exhaust pressure is sufficient, the turbine spins, and the turbo is on boost.

On-car balance:

In contrast with off-car balancing (which removes a wheel from the vehicle) on-car balancing leaves the wheel on the vehicle and a special machine is used to balance the tire, wheel and brake assembly making adjustment for all of these components. Obviously this is the best (and most costly) procedure in obtaining balance.

On-center feel:

The responsiveness and feel of the steering when the wheel is approximately centered. In a car with good on-center feel, the steering wheel tends to return to center when slightly deflected, assisting straight-line stability.

One:

See formula One

One-coat finish:

A finish consisting of a single coat of paint

One eyed monster:

Trucker slang for T.V. set as in "I think my kids would die if the one-eyed-monster broke."

One-groove track:

Regardless of the width of a track, going into and coming out of a tight turn causes the track to have room for only one line of race cars rather than two.

One-off:

A car or spare part of which only a single unit is made

One off:

A car or spare part of which only a single unit is made

One-piece rim:

A wheel rim consisting of one part, designed for tubeless tire mounting. The opposite is a multi-piece rim

One-piece rim designation:

A coded description of a one-piece wheel rim.

One-piece wheel:

A wheel with a rim constructed in one piece incorporating a well formation at or near its center to enable the tire beads to be mounted over the rim flanges. A cast wheel, a one-piece forged wheel, and a steel wheel have either a 5° drop center rim, 15° drop center rim, wide base rim, or double wide base rim are one-piece wheels. The opposite is a multi-piece wheel

One price selling:

Published fixed price displayed on a new vehicle eliminating need for negotiation.

One-way:

See reactor one-way clutch

One way clutch:

A mechanical clutch which transmits power in one direction of rotation only; when torque is not applied, the driven member rotates freely; used in automatic transmissions and the old freewbeel.
Also See:
freewheeling
sprag clutch
reactor one-way clutch

One-way clutch:

See oneway clutch

One-way valve:

See check valve

On-line:

A state in which a piece of equipment or subsystem is directly connected with or incorporated into the main system

On-line painting:

A painting of components within the actual painting line. This is especially relevant for plastic moldings, which are fitted to the metal car body after the welding assembly operation. On-line painting means that such plastic parts are painted together with the body and must withstand the bake-in temperatures of about 150°C

ONO:

Acronym for "or nearest offer" as a term of negotiation which indicates that the seller is not too flexible in his price.

On/off delay:

See headlight on/off delay system

On-the-car balancing:

Balancing the wheel while it is still attached to the car. The opposite is off-the-car balancing

On-the-dolly panel beating:

A metalworking technique used to tap out dents in the bodywork. The dolly is held directly under the ridge in the panel so that the dolly contour closely matches that of the original panel shape. Hammering is then directed at the peak of the ridge, working along the ridge from end to end in a progressive manner to push the area down gradually to its original shape

On-the-road charges:

Extra charges, in addition to the list price of a new car, to cover delivery, license, etc.

On the side:

Trucker slang for Pulled over on the shoulder as in "You got a 4-wheeler on the side up ahead."

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