Ford Duratec (badge, not an engine)
naturally aspirated · petrol · 1993–present
Also known as: duratec, cyclone, 3.7 duratec, st170, st220
Duratec is a badge, not an engine. Ford has used it since 1993 for almost any petrol engine it sells, and this catalogue's own rows show it spanning 1.2 to 3.7 litres across Ford, Mazda, Jaguar, Lincoln and Mercury.
Three genuinely unrelated designs wear it here. The four-cylinders are Mazda's L-series — a joint design, and the Mazda service literature is often the better source. The V6s are Ford's Cyclone. And the Jaguar AJ25 and AJ30 are a different V6 family again, badged Duratec in the X-Type.
So a Duratec is not a thing you can look up. Establish the displacement and the internal family — L8-DE, Cyclone, AJ25 — and every useful answer follows from that.
The badge does say one thing reliably: naturally aspirated. Ford's turbocharged petrols are EcoBoost and its diesels are Duratorq, so a car described as Duratec has neither — which is a real, if narrow, piece of information.
And the four-cylinders share one characteristic worth knowing: they are non-interference in most versions, so a broken timing belt or chain does not usually bend valves — the opposite of most of what is written about timing failures elsewhere in this catalogue.
Cars fitted with this engine
36 generations, across 5 makes. From the authored catalogue — an absent car means the catalogue has not reached it, not that the engine was never fitted.
Ford
- Contour First generation 1995–2000
- Taurus Third and fourth generation 1996–2007
- Focus Mk1 1998–2004
- Mondeo Mk3 2000–2007
- Escape First generation 2000–2007
- Transit Connect First generation 2002–2013
- EcoSport First generation 2003–2012
- C-Max First generation 2003–2010
- Focus Mk2 2004–2011
- Freestyle First generation 2004–2009
- Transit Mk7 2006–2014
- Edge First generation 2006–2014
- S-Max First generation 2006–2014
- Escape Second generation 2007–2012
- Mondeo Mk4 2007–2014
- Fiesta Mk6 2008–2017
- Taurus Fifth and sixth generation (D3) 2008–2019
- Flex First generation 2008–2019
- Escape Third generation 2012–2019
- Edge Second generation 2015–2024
Jaguar
Lincoln
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Posted about this engine
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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