HK-HG Monaro / GTS

1968-1971 / Coupe / Australia

All HK-HG Monaro / GTS problems All workshop issues

Critical Body, Structural Rust

A-Pillar Rust (Coupe)

Symptoms

Rust at the base of the A-pillars, around the windscreen area, and in the lower A-pillar structure behind the door hinges.

Cause

The pillarless coupe lacks B-pillars, so the A-pillars carry a greater structural load. Water ingress through deteriorated windscreen seals attacks the A-pillar from the inside. The lower A-pillar area is a mud and moisture trap.

Fix

This is a critical structural repair that requires expert-level panel work.

The A-pillars must be sectioned and new metal welded in.

Budget $3,000-6,000 per side.

Do not compromise on the quality of this repair, A-pillar integrity is essential for the coupe body's structural strength and crash safety.

Cost mentioned in fix

Budget $3,000-6,000 per side

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Other known issues

Critical Body, Structural Rust

Inner Guard Rot

Rust visible (or hidden) on the inner front guards, particularly where they meet the firewall and chassis rails.

Critical Body, Structural Rust

Floor Pan and Sill Rust

Perforated floor pans, crumbling sills, soft metal when prodded from underneath.

Common Body, Structural Rust

Boot Floor and Rear Drop Panel

Rust in the boot floor, spare tyre well, and the panel below the rear window (the "drop panel").

Critical Engine, Chevrolet V8 (327ci / 350ci)

Intake Manifold Gasket Leaks

Coolant leak at the front or rear of the intake manifold. Coolant may drip externally or, worse, leak internally into the engine oil. May also cause a vacuum leak, resulting in rough idle and poor fuel economy.

Common Engine, Chevrolet V8 (327ci / 350ci)

Rochester Quadrajet Carburettor Issues

Hesitation on acceleration (bog), flooding, fuel smell, hard starting when hot, black smoke, erratic idle.

Critical Engine, Chevrolet V8 (327ci / 350ci)

Overheating Under Load

Temperature gauge climbs on highway drives, particularly towing or climbing hills. May push coolant out the overflow. Engine pings (detonation) under load.

View all 18 HK-HG Monaro / GTS problems