Reliability Guide

Common Problems with the
2006–2009 Caterham Seven (Ford Sigma / Duratec)

We've identified 2 known issues that can affect the 2006–2009 Caterham Seven (Ford Sigma / Duratec). 1 of these are serious faults that could be expensive to repair.

Known Issues

Serious

Moderate

Minor

The 2006–2009 period has 1 more issue than the Caterham Seven (Ford Sigma / Duratec) average across all year periods.

All Known Issues

De Dion Tube Fatigue

SeriousSuspension & Chassis

The De Dion tube can develop hairline cracks near the welds on cars used heavily on track or with stiff suspension.

Most affected: All De Dion equipped models

Estimated cost: £400–£700Affects: 2006–2025

Typical symptoms

•Vague rear-end handling
•Cracks visible in paint/coating of the tube

What to inspect before you buy

✓Thoroughly clean and inspect the De Dion tube welds.
✓Look for "fretting" marks (rust dust) near joints.

Engine Mount Cracking

ModerateEngine

The vibrations from the Duratec engine, especially in higher states of tune, can crack the engine mounting brackets.

Most affected: 420, 485, and 620 models

Estimated cost: £150–£400Affects: 2006–2025

Typical symptoms

•Excessive engine movement
•New vibrations through the chassis

What to inspect before you buy

✓Inspect engine mounts for cracks or perished rubber.

Buying Tips for the 2006 Caterham Seven (Ford Sigma / Duratec)

✓Check the condition of the De Dion rear suspension tube for any signs of cracking or stress if the car has been tracked heavily.
✓Inspect the exhaust manifold for cracks, particularly on higher-output Duratec models where heat cycling takes a toll.
✓Test all electrical switches and dials; the classic toggle switches can occasionally suffer from poor earth connections.
✓Verify that the Ford engine has been serviced regularly, paying attention to the timing chain tensioners on higher-mileage Duratecs.
✓Examine the weather gear (roof, doors, tonneau) for tears or shrinking, as replacements can be expensive.
✓Look for any stone chip damage on the rear wings, which take a constant beating from the front tyres.

2010–2014 Caterham Seven (Ford Sigma / Duratec)