ENGINE IDENTIFICATION
Note. For repair procedures not covered in this article, see ENGINE OVERHAUL PROCEDURES article in GENERAL INFORMATION.
Engine model may be identified by eighth character of Vehicle Identification Number (VIN). See ENGINE IDENTIFICATION CODE table. VIN is stamped on a plate located on top of instrument panel, near lower left of windshield. VIN is also stamped on Vehicle Certification Label located on left front door pillar.
Note. VIN Z is an alternative fuel engine. Information on this engine is not available.
| Application | Code |
|---|---|
| 2.0L | 3 |
ENGINE IDENTIFICATION CODE
For general engine information, see GENERAL SPECIFICATIONS table under ENGINE SPECIFICATIONS.
DESCRIPTION & OPERATION
The 2.0L Zetec-VTC engine is a 4 cylinder engine with double overhead camshafts and 16 valves. The 16 valve cylinder head improves volumetric efficiency, particularly at high engine speeds. The 2.0L engine has variable camshaft timing. The cylinder head is made of aluminum alloy and the cylinder block is made of cast iron.
The new timing belt cover has a vertical strengthening rib for additional reinforcement. As a result of this, the center timing belt cover (and therefore the front engine mounting) has to be removed in order to replace the timing belt.
The spark plug is installed in the center of the roof-shaped combustion chamber to ignite the air/fuel mixture in the combustion chamber. The central location of the spark plug causes the flame front to be evenly spread across the combustion chamber, which also reduces spark knock.
Both camshafts are driven by a shared timing belt, and operate four valves per cylinder by means of adjustable tappets. The exhaust valves are subjected to extremely high temperatures as a result of the exhaust gases flowing part them. In order to conduct the heat away from the valve heads, the exhaust valves are impregnated with sodium. One spring on each valve is set to close the valve. The spring on the exhaust valve is marked with a blue paint mark, and the spring on the intake valve with a red one. The adjusting shims in the valve tappets can be changed to correct the valve clearance. These are available in 52 different thicknesses. The shim thickness is stamped on the back of the shim in hundredths of a millimeter. Because of space limitations the camshafts have to be removed before the adjusting shims can be replaced. This means that a high degree of accuracy is required during adjusting to avoid repeated removal and installation of the camshafts. The camshaft cam lobes run concentrically on the valve tappets. At engine speeds of above about 3000 RPM the tappets rotate, and they in turn transfer the rotation to the valves. This valve rotation is desirable because it produces an even valve seating and prevents the valves from wearing in a certain position which could cause to leak. To identify engine components (Scheme 71)- (Scheme 73).
