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GT

An acronym for gran turismo, Italian for "grand touring.".

GTAC

An acronym for gas-tungsten arc cutting.

GTAW

An acronym for gas-tungsten arc welding.

GTO

An acronym for gran turismo omologato.

GTW

An acronym for gross trailer weight.

Guard

A barrier, such as a shroud, that physically prevents entry of the operator's hands or fingers into the point of operation.

Gudgeon Pin

English term for wrist pin.

GUI

An acronym for Graphical User Interface. A program interface that takes advantage of the computer's graphics capabilities to make the program easer to use such as Microsoft Windows.

Guide

1. A part used to align an assembly or another part. 2. The support for a valve stem in the head.

Guide Block

A metal or hard-rubber device used to maintain timing-chain tension.

Guide Insert

A valve-guide insert that is not an original part of the cylinder head; used to replace a worn integral valve guide.

Guide Liner

A thin, bronze sleeve used to repair a worn-out valve guide.

Guide Plate

A metal plate on the cylinder head that keeps the push rod aligned with the rocker arm.

Guide Rail

A device that keeps the timing chain aligned and in the correct position.

Guide Seal

A seal that prevents oil from being drawn into the valve guide.

Guide Shoe

A device used to maintain tension on the timing chain of an overhead-cam engine.

Guide Sleeve

A tubular sleeve that is placed on a connecting rod bolt when it is removed, to prevent the bolt threads from scratching the crank pin.

Guide-Matic

An electronic headlamp control that automatically shifts between upper and lower beams as required.

Guide-mounted Seal

A seal that mounts directly onto the valve guide.

Gullwing

A coupe-body style with the doors hinged so they open upward.