IsItAGoodCar
Reliability Guide

Common Problems with the
1971 Datsun 240Z / 260Z

The 1971 model year saw the 240Z finally reach UK showrooms in meaningful numbers, having first appeared at the Earls Court Motor Show in late 1970. European-spec cars received unique suspension tuning with stiffer springs and thicker anti-roll bars, a front air dam, and a rear spoiler — all designed to address high-speed stability and crosswind sensitivity identified during pre-production testing. The UK remained a right-hand-drive market.

What changed for 1971

  • •UK sales began in earnest with European-spec suspension tuning
  • •Front air dam and rear spoiler added as standard
  • •Stiffer springs and thicker anti-roll bars for European roads

Common MOT watch-outs

  • !Rust was already a concern even on near-new cars; check battery tray and floor pans
  • !Carburetor adjustment required for UK fuel quality
4
Known Issues
2
Serious
2
Moderate
0
Minor

All Known Issues

Structural Corrosion (Rust)

SeriousBodywork & Rust

The S30 chassis has many hidden box sections where moisture traps and eats the metal from the inside out. Frame rails, battery trays, and floor pans are the most common failure points.

Est. Repair Cost: £5,000–£20,000+
Warning Signs:

Bubbling paint, Soft spots in floor/sills, Doors not aligning (suggesting chassis flex), MOT failure for structural rot

What to Inspect:
  • Magnet test on sills and arches
  • Hammer tap on frame rails
  • Check under the battery tray for acid/water damage
Verified by IsItAGoodCar Research Team

Overheating & Head Gasket Failure

SeriousCooling System

Older L24/L26 engines can suffer from silt buildup in the radiator or blocked coolant passages in the block, leading to localized overheating and warped heads.

Est. Repair Cost: £1,000–£3,000
Warning Signs:

Temp gauge climbing in traffic, White smoke from exhaust, Mayo-like sludge under oil cap

What to Inspect:
  • Condition of coolant (should be clean)
  • Ask when the water pump/radiator was last replaced
  • Test for exhaust gases in coolant
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Carburetor & Fuel System Issues

ModerateFuel System

The Hitachi-SU carburettors require regular maintenance and adjustment. Worn needles, vacuum leaks and gummed-up passages cause flat spots, poor idle and hesitation. Parts are hard to source, with many owners converting to Webers.

Est. Repair Cost: £200–£600
Warning Signs:

Hesitation on acceleration, Stalling at idle, Rich or lean running, Strong fuel smell

What to Inspect:
  • Check for smooth throttle response through the range.
  • Look for fuel leaks around carburettors.
  • Inspect fuel lines for perishing.
  • Ask if Weber conversion has been done.
Verified by IsItAGoodCar Research Team

Wiring Loom Degradation

ModerateElectrics & Electronics

After 45+ years, the original wiring loom becomes brittle. Corroded fuse connections, cracked insulation and perished earth straps cause intermittent electrical faults throughout the car.

Est. Repair Cost: £100–£500
Warning Signs:

Intermittent lighting failures, Gauge erratic behaviour, Flickering dashboard lights, Blown fuses

What to Inspect:
  • Inspect fuse box for corrosion.
  • Check all earth points for clean metal contact.
  • Test all electrical systems including lights and gauges.
  • Consider a relay upgrade for headlights.
Verified by IsItAGoodCar Research Team

Buying Tips for 1971 Datsun 240Z / 260Z

  • ✓European-spec 1971 cars are distinguishable by their front spoiler and rear ducktail
  • ✓Early UK cars are rare and desirable; verify originality carefully
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Check a 1971 Datsun 240Z / 260Z by Registration