Zetec
The first Zetec engine appeared in 1992, powering the fourth generation of the European Ford Escort and Orion. It was codenamed as the "Zeta" engine before Italian car maker Lancia threatened to sue Ford for trademark infringement as it already owned the name. Ford hurriedly renamed the engine "Zetec".
Early versions of the engine (prior to mid 1998) came complete with self-adjusting hydraulic valves. This help prevented the notorious valve tapping (on the CVH) but caused other issues. The biggest problem was that a special Ford formulation of oil was required otherwise the valves tended to stick. Similarly, if the engine wasn't regularly revved above 4000 RPM, the valves tended to stick then too. For these reasons, conventional tappets with shims were introduced in 1998.
Series 1
How to Identify: Rocker Cover has "DOHC 16V" written on it.
Known as the Zetec-E engine these have proved to e very reliable some covering more than 200K Miles.

Series 2
How to Identify: Rocker Cover has "16V Zetec" written on it and the oil filter is atached to the oil pump.

Series 3
How to Identify: Rocker Cover has "Zetec-R" written on it, some early ones had "16V Zetec" written on it like the Series 2 but the oil filter is attached to the block. The S3 engine also has the starter motor mounted high on the inlet side and due to this a Gearbox lug is missing.

1992 Series 1 - distinguishable by the "DOHC 16v" lettering embossed on the cam cover. Early Series 1's suffered from teething problems including sticking valves.

1995 Series 2 - distinguishable by "Zetec 16v" lettering embossed on the cam cover. Minor revisions to aleviate sticking valve problems. Also improvements to spark plugs, injectors, gaskets and cosmetics.

Po ovome je moj koji je '94. godiste imao ovaj motor iz '95.

1998 Series 3 - the current model Zetec, as used in the Focus and Mondeo. A very different engine to the earlier Zetecs, both visually with it's black plastic cam cover, and internally. Starting at the top, the Series 3 features new injectors - end fed unlike the side fed units on the S1 and S2, and with a twin jet spray pattern. Solid tappets with adjustment shims replaced the hydraulic predecessors and the cam belt timing tensioning setup has been revised. The pistons are teflon coated to reduce friction, and the bearing caps are on a single piece frame to increase strength. The water pump was of a new outboard design, with large vanes for improved flow. The block was strengthened - a larger amount of metal between the bores is clearly visible in comparison with the S1 and S2. The oil filter mounting became integral to the base of the block and the sump gained a windage tray and baffles to reduce oil surge. The sump's webbing was also improved in an effort to combat block flex.

Fiesta compatability

The 1.6 and 1.8 Fiesta units are a direct fit, as you'd expect. The 2.0 Series 1 and 2 will fit, but require several modifications. The Series 3 requires new mounts fabricating, plus wiring loom modifications and re-routing of hoses.