Models · Caterham
Caterham Seven buying guide
The Caterham Seven is a lightweight two-seater with a tubular steel space-frame chassis and aluminium and composite panels, sold with a long list of Rover, Ford, Vauxhall and Suzuki engines, in narrow S3 and wider SV chassis.
The versions
- Rover K-series 1.4, 1.6 and 1.8 from 1996, including the Roadsport and Superlight models
- Ford Sigma and Duratec engines after Rover's 2005 collapse, such as the Roadsport 125 (1,595cc, 125bhp)
- Seven 160 (2013 on, S3 chassis only): 660cc turbocharged Suzuki three-cylinder
- Ford T9 five-speed or Caterham six-speed manual; de Dion rear axle on most cars, live axle on some
- S3 (narrow) and SV (longer and wider) chassis; factory-built or owner-built
What to check on a Caterham Seven
3 model-specific things to look at when you view one. They're a starting point, not the full inspection.
Chassis tubes and corrosion
What to look for: With the car in the air, look along the steel tubes of the frame and their welds for rust, cracks and broken powder coating. Look where the aluminium panels meet the steel rails, and at the lower panels for bubbling paint and gravel damage.
Why it matters: The aluminium and composite body doesn't rust, but the steel space-frame can, and galvanic corrosion forms where steel rails meet aluminium panels. Bubbling paint on the lower skins points to corrosion underneath. Sound powder coating is the frame's protection, so a well-kept frame is a sign of a car that's been looked after.
K-series head gasket and coolant
What to look for: On a K-series car, look at the coolant for colour and cleanliness, check the coolant pipes for leaks and corrosion, and look under the oil filler cap for a milky residue.
Why it matters: K-series head gasket failure is known from the MGF and Freelander. It's less common in the Seven, which is far lighter, and usually less serious if caught early. Clean coolant and sound pipes reduce the risk.
Top-end noise and oil pressure
What to look for: With the engine warm, listen at the top of the engine for tappet noise, and watch the oil pressure gauge at idle and on the drive. Ask how often the oil has been changed and whether the car has been used on track.
Why it matters: Noisy tappets can point to oil starvation during track days, or to oil foam blocking the oil feed pipe. Yearly oil changes are recommended, or every 1,000 to 1,500 miles with track use. The Ford and Rover engines are otherwise reliable, even tuned, because they have so little weight to pull.
Also in the full guide
- The differential
- The cold start, test drive and paperwork checks for the exact version you're viewing
The full guide to the Caterham Seven
The CrankSight guide walks you round the car on your phone at the viewing, with every check for the exact version you're looking at: what to look for, where to find it, and what anything you find is likely to cost. As you go it builds an assessment of that car, and if you view more than one, it lines them up side by side.
£29 for the model, used on as many cars as you like, delivered within 72 hours or your money back.
General points for the model, last checked October 2026. Every car is different, so treat this as a guide to what to look at, not a verdict on any car. CrankSight is independent and has no connection with Caterham.