Engine Description
The Zetec engine (formerly Zeta) is a DOHC, four-cylinder, transversely mounted engine at the front of the car with the gearbox on the left side. The Zetec-E engine is identical to the Zetec except for changes to the intake system and emission control components.
All the main engine units are made of aluminum alloy, except for the plastic toothed belt covers and the cast-iron cylinder block. The crankshaft is five-bearing, with fixation from axial movement by thrust half rings, which are installed on the central main bearing.
The pistons are connected to the connecting rods by piston pins, which are installed with a fixed fit in the upper head of the connecting rod. The pistons are made of aluminum alloy and have three rings: two compression rings and one oil scraper ring. During manufacture, the cylinder diameters and pistons are classified into three classes, which must be matched during assembly for the correct piston clearance in the cylinder. The intake and exhaust valves are closed by cylindrical springs.
The camshafts are driven by a toothed belt. Each camshaft controls eight valves via hydraulic tappets. Thus, no valve clearance adjustment is required. Each camshaft rotates in five bearings, which are made directly in the cylinder head and are covered by bearing caps. This means that the bearing caps are machined together with the cylinder head and cannot be replaced separately from the head.
The water pump is bolted to the front of the cylinder block and is driven, along with the power steering pump and alternator, by a flat multi-groove belt from the crankshaft pulley. Lubrication is provided by an oil pump mounted on the right end of the crankshaft, which draws oil through a strainer located in the oil pan. The pump delivers oil through an externally mounted full-flow oil filter. Some engine models have an oil cooler installed in the base of the oil filter to ensure that the engine oil entering the engine is cooled by the cooling system.
Repairs that do not require engine removal
The following operations can be performed on the engine installed in the vehicle:
- compression test
- removing and installing the cylinder head cover
- replacement of the timing belt
- removing and installing the timing belt tensioner
- replacement of camshaft sealing rings
- removal and installation of camshafts and hydraulic tappets
- removal and installation of the cylinder head
- cleaning the cylinder head and pistons
- removing and installing the oil pan
- replacement of crankshaft sealing rings
- removing and installing the oil pump
- flywheel/drive plate removal and installation
- inspection and replacement of engine/gearbox (powertrain) mounting mounts
This article is a copy from the website FORDBOOK.RU