About Section
1. This Part of Section 2 deals with repair operations performed in the engine compartment. The procedures for removing, installing and overhauling the engine are described in Section 2C.
2. All procedures are described with the engine still in the vehicle. If the engine has been removed for overhaul, ignore the additional information that precedes each step.
Engine - general description
3. The models described are equipped with water-cooled V6 engines with two camshafts in each of the cylinder heads. The camshafts are driven by a toothed belt. The cylinder heads are at an angle of 54°to each other, which ensures maximum engine compactness. This type of engine is often referred to as the V6 ECOTEC (which means «with optimized exhaust gas recirculation»).
4. The crankshaft rotates in the cylinder block on four main bearings. Main bearing No. 4 (near flywheel/drive plate) equipped with thrust washers that regulate the axial clearance of the shaft.
5. The connecting rods are attached to the crankshaft by means of connecting rod bearings, and to the pistons by piston pins. The pistons are made of aluminum alloy and are equipped with three piston rings - two compression and one oil scraper.
6. Camshafts rotate directly in the cylinder heads (without casing) and are driven from the crankshaft by a toothed belt. The camshaft cams push hydraulic tappets, which in turn actuate the valves. Tappets automatically adjust valve clearances.
7. Lubrication is pumped into the engine by an oil pump mounted on the front end of the crankshaft. Oil is sucked from the sump through a mesh oil receiver, then driven through a cartridge-type filter installed on the engine. It then flows into the assembly galleries of the pressure frame/main bearing caps and cylinder block/crankcase, from where it is distributed over the crankshaft (main bearings) and distributors. The connecting rod bearings are supplied with oil through internal holes in the crankshaft, and oil is supplied to the camshaft bearings under pressure. The camshaft cams and valves are lubricated by dripping oil, as are all other engine components. On the block (between his heads) installed engine oil cooler.
8. The models described use a semi-closed crankcase ventilation system. The crankcase gases are pulled out from under the valve cover and fed through a hose into the intake manifold.
Repair operations performed without removing the engine
9. Without removing the engine, the following actions can be performed:
- A) Removal and installation of heads of the block of cylinders.
- b) Removal and installation of a toothed belt and sprockets.
- V) Replacing camshaft seals.
- G) Removal and installation of camshafts and hydraulic pushers.
- d) Removal and installation of the pallet.
- e) Removal and installation of connecting rods and pistons *.
- and) Removal and installation of the oil pump.
- h) Replacing crankshaft seals.
- And) Replacement of engine mounts.
- To) Removal and installation of a flywheel/drive disk.
* although the operation marked with an asterisk can theoretically be performed in the engine compartment after removing the pan, it is not recommended to do so. Such procedures are much easier and safer (in terms of the risk of damaging components) be performed on a removed engine. For this reason, the procedure is described in Section 2C.
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