The Zetec engine, (formerly Zeta), is of sixteen-valve, double overhead camshaft (DOHC), four-cylinder, in-line type, mounted transversely at the front of the vehicle, with the (clutch and) transmission on its left-hand end. Apart from the plastic timing belt covers and the cast-iron cylinder block/crankcase, all major engine castings are of aluminium alloy.

Repair operations possible with the engine in the vehicle

The following major repair operations can be accomplished without removing the engine from the vehicle. However, owners should note that any operation involving the removal of the sump requires careful forethought, depending on the level of skill and the tools and facilities available; refer to the relevant text for details:

• a) Compression pressure - testing.
• b) Cylinder head cover - removal and refitting.
• c) Timing belt covers - removal and refitting.
• d) Timing belt - renewal.
• e) Timing belt tensioner and toothed pulleys - removal and refitting.
• f) Camshaft oil seals - renewal.
• g) Camshafts and hydraulic tappets - removal and refitting.
• h) Cylinder head - removal, overhaul and refitting.
• i) Cylinder head and pistons - decarbonising.
• j) Sump - removal and refitting.
• k) Crankshaft oil seals - renewal.
• l) Oil pump - removal and refitting.
• m) Piston/connecting rod assemblies - removal and refitting
• n) Flywheel/driveplate - removal and refitting.
• o) Engine/transmission mountings - removal and refitting.