2000GT

1967-1970 / Coupe / Japan

All 2000GT problems All workshop issues

Critical Electrical

Wiring Harness Degradation

Symptoms

Intermittent electrical faults, lights flickering, gauges reading incorrectly, starter motor not engaging, charging system faults.

Cause

The original wiring harness uses cloth-wrapped wiring with rubber insulation that becomes brittle and cracks after 55+ years. Connections corrode, solder joints develop high resistance, and insulation failure can cause short circuits.

Fix

For a car that will be driven, a complete rewire using a reproduction harness (available from specialist suppliers) is the safest option.

For a concours car, the original harness can be carefully restored by replacing individual wires and refreshing connections.

Cost: $3,000-8,000 AUD for a reproduction harness and installation; $5,000-15,000 for an original harness restoration.

Cost mentioned in fix

Cost: $3,000-8,000$5,000-15,000 for an

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Other known issues

Common Electrical

Instrument Failure

Inaccurate or non-functioning instruments, speedometer, tachometer, gauges, or clock.

Common Engine, 3M 2.0L DOHC Inline-6 (Yamaha-Built)

Carburettor Deterioration and Synchronisation Drift

Rough idle, uneven power delivery, flat spots during acceleration, poor fuel economy, and difficulty starting. The engine may run rich on some cylinders and lean on others.

Critical Engine, 3M 2.0L DOHC Inline-6 (Yamaha-Built)

Timing Chain Stretch

Rattling or slapping noise from the front of the engine, particularly on cold startup. In advanced cases, the cam timing shifts, reducing power and causing rough running.

Critical Engine, 3M 2.0L DOHC Inline-6 (Yamaha-Built)

Oil System Leaks (Dry Sump)

Oil puddles under the car, oil residue on the engine and chassis, dropping oil level in the external oil tank. Potential oil starvation if leaks are severe.

Common Engine, 3M 2.0L DOHC Inline-6 (Yamaha-Built)

Valve Clearance Drift

Ticking noise from the valve train at operating temperature, gradual loss of power, uneven cylinder performance.

Critical Cooling System

Radiator Core Degradation

Overheating, coolant loss, visible corrosion on radiator fins, reduced cooling efficiency.

View all 13 2000GT problems