Dictionary of Automotive Terms Abbreviations

DICTIONARY OF AUTOMOTIVE TERMS - "Gu"

Guarantee: A promise by the manufacturer to fix or replace a specific part if it does not last for a specific time period or distance.

Guard: See
Chain guard
Dog guard
Edge guard
Oil pan guard
Side radiator guard
Splash guard
Stone guard
Sump guard

Gudgeon pin: British term for a Piston pin or wrist pin.

Gudgeon pin boss: British term for Piston boss

Gudgeon pin circlip: A British term for Piston pin circlip

Gudgeon pin end: British term for Piston pin end

Guibo coupling: A doughnut-shaped type of flexible coupling

Guide: A device which allows a long shaft to do its job without flexing.

Also See
Cable guide
Oversize valve guide
Valve guide
Glass's Guide

Guide bolts: Floating calipers slide on these bolts to center over the rotor when braking action occurs.

Guide coat: A thin coat of paint designed to highlight imperfections

Guide driver: See
Valve guide driver

Guided send test: Bending a specimen in a definite way by using a fixture.

Guided vehicle system: See
Automated guided vehicle system

Guide pins: Floating calipers slide on these pins to center over the rotor when braking action occurs.

Guide pulley: See
Jockey pulley

Guide reamer: See
Valve guide reamer

Guide remover: See
Valve guide remover

Guide seal: See
Valve guide seal

Guillotine: A bench tool for cutting sheet metal. The sheet is pulled in by two adjustable rollers (one above and the other below) as the tool cuts the metal in either a straight line or a curve as desired.

Gull-wing door: Click image to supersize Mercedes Gullwing

A roof-hinged door that opens upward. It was first used on the Mercedes-Benz 300 SL in the early 1950s

Gulp system: See
Air gulp system

Gulp valve: A vacuum-controlled valve that admits fresh air to the inlet manifold during deceleration to prevent backfiring in the exhaust system; its vacuum signal is governed by a Thermovalve and a Solenoid valve to ensure that the gulp valve action does not interfere with cold start enrichment.

Also See
Air gulp valve
Air bypass valve

Gum: The Oxidized portions of the fuel that form deposits in the Fuel system or engine parts.

Also See
Curing gum
Cushion gum
Repair gum

Gum deposit: A sticky deposit that occurs when gasoline remains unused in the tank for a period of time. The use of detergent in gasoline (or pouring in some Fuel stabilizer) helps prevent its formation.

Gum stock: Rubber compounds containing only the necessary ingredients for vulcanizing. Reinforcing fillers are not present in gum stock.

Also See
Cushion gum.

Gun

To press the accelerator hard to make the engine roar at top rpm.
A device for applying paint or grease.

Also See
Airless spray gun
Blow gun
Compressed-air spray gun
Gravel gun
Gravity-feed spray gun
Grease gun
Paint gun
Pressure-feed spray gun
Rivet gun
Spray gun
Suction-feed spray gun
Top feed gun

Gun nozzle cleaning unit: See
Spray gun nozzle cleaning unit

Gunwale bar: See
Stringer bar

Gusset: A triangular plate secured across an angle to reinforce a joint

Gusset plate: A triangular plate secured across an angle to reinforce a joint

Gut

To strip the interior of the vehicle.
To remove the internal Baffles from a Muffler.

Gutted muffler: A Muffler with no silencing Baffles. Makes a very loud sound.

Gutter

The recessed part on a truck rim base that holds the lock ring in place.
A channel at the edge of a road to carry away rainwater.
A thin U-shaped channel on the sides of the roof of a car or truck to prevent water on the roof from splashing on you as you get into your vehicle.

Gutter bevel: Truck rims are bevelled to provide for the gutter and this bevel matches a 28° taper at the inside of the cast spokes, holding the rim in place.

Gutter system: A roof rack designed to fit older cars and trucks that have external rain gutters.

Guzzler: See
Gas guzzler