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MOTRS

HK-HG Monaro / GTS

1968-1971 / Coupe / Australia

All HK-HG Monaro / GTS problems All workshop issues
Common Electrical

Generator/Alternator Charging Issues

Symptoms

Battery goes flat, dim lights, instruments dim, engine stalls.

Cause

Early HK models used generators; later models used alternators. Either way, the charging components are 55 years old. Voltage regulators fail, bushes wear, and the wiring deteriorates.

Fix

Replace with a modern internally-regulated alternator ($200-400).

Clean all earth points.

Replace corroded wiring sections.

Cost mentioned in fix
$200-400

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Other known issues

Common Electrical

Ignition System Deterioration

Misfiring, rough running, poor starting, timing drift.
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.
Common Engine, Chevrolet V8 (327ci / 350ci)

Hydraulic Lifter Noise

Ticking or clattering from the top of the engine that varies with RPM. May be audible at idle and disappear at higher RPM, or vice versa.
Common Engine, Holden Six (186ci) and V8 (253ci)

Oil Leaks, Rear Main Seal

Oil drips from the bellhousing area. Oil accumulates on the underside of the engine and transmission.
View all 18 HK-HG Monaro / GTS problems