HK-HG Monaro / GTS

1968-1971 / Coupe / Australia

All HK-HG Monaro / GTS problems All workshop issues

Critical Body, Structural Rust

Floor Pan and Sill Rust

Symptoms

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

Cause

Standard Holden problem, water ingress from above and road spray from below attacks the floor and sills relentlessly.

Fix

Cut and replace with reproduction panels.

Floor pan sections and sill repair panels are available.

Budget $2,000-5,000 per side for sills, $3,000-8,000 for comprehensive floor pan replacement.

Cost mentioned in fix

Budget $2,000-5,000 per side$3,000-8,000 for comprehensive

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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

A-Pillar Rust (Coupe)

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

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