General information about engines (Opel Vectra C)

1. Vectra-C/Signum, like any Opel model range, is traditionally distinguished by an extremely wide range of engines offered to consumers. The full list of engines used to equip the models under consideration is given in the Specifications at the beginning of this Chapter. The general appearance of the basic models of petrol and diesel models is shown in the accompanying illustrations 1.1a and 1.1b.







2. On the models discussed in this manual, it is planned to install 4-cylinder inline, 6-valve engines equipped with two overhead camshafts (DOHC) - Z16XE, Z18XE, Z22SE, Z22YH and Z19DTH, or one camshaft (SONC) - Y20DTH and Y22DTR. The only exception is the Z19DT diesel engine, which has 2 valves per cylinder (single camshaft). In addition, the cars can be equipped with 6-cylinder 24-valve engines with a volume of 3.0 l (diesel) and 3.2 l (petrol) with a V-shaped arrangement of cylinders and four camshafts. The engine is mounted on rubber-metal supports transversely in the front part of the car and has water cooling, the engine lubrication system is a closed type with a wet sump. The drive is carried out to the front wheels by means of a transmission assembly fixed to the left of the engine.

3. The cast cylinder head is made of aluminum alloy and has a threaded connection with the cylinder block. Aluminum has higher thermal conductivity and a lower specific gravity compared to cast iron. Steel valve seats and guides are pressed into the head. Due to the presence of a hydraulic compensator in most engines (except Z19DT and Y30DT) the valve clearance is maintained automatically, eliminating the need for adjustment during engine maintenance.

4. The basic diagram of the engine lubrication system is shown in the accompanying illustration. The lubrication system operates from an oil pump driven by the crankshaft journal. On some engine models, the pump may be driven by a toothed belt or chain. Oil is drawn from the engine oil pan through an oil intake equipped with a mesh filter and is filtered by a full-flow replaceable oil filter. The oil pump is equipped with a pressure-reducing valve. When a certain pressure value in the lubrication system is exceeded, the valve opens and excess oil is drained into the boat pan. Oil moves along oil flows provided in the block casting. From the oil filter, the main flow of oil under pressure is fed to the main oil line and then to the crankshaft bearings through special drillings in the shaft body, as well as to the piston bottoms and cylinder liner walls. At the same time, oil flows through vertical channels to the cylinder heads to lubricate the camshaft bearings. When the full-flow oil filter becomes clogged, the bypass valve opens and oil is supplied to the main oil line, bypassing the filter (unfiltered). Lubrication of the camshaft lobes and valve components, as well as other internal engine components, is carried out by the splash method.



Oil filter type:

• Engines Z20NET/Z22SE/Z22YH/Z19DT/Y20DTH/Y22DTR/Y30DT — with replaceable filter element
• Engines Z16XE, Z18XE(R) - non-disassemblable, fully replaceable
• Permissible oil consumption per 1000 km, l — no more than 0.6

5. Opel continues to improve the design of engines. Due to space limitations and the paucity of sources of information, this Guide only examines in more detail the modifications of earlier engines (up to and including 2004) release. At the time of the Guide's release, petrol models equipped with a new 6-cylinder engine with a capacity of 2.8 liters began to enter the Russian market, but Opel dealers do not yet have detailed information on its repair.

6. To check the technical condition of the engine, perform work on diagnosing the engine systems and mechanisms, its maintenance and repair, a fairly large range of special devices and instruments with a set of adapters is required, as well as certain experience in working with such tools, so the authors of this Manual strongly recommend contacting specialized service stations of official representatives of the Opel company for maintenance and repair. In addition, the format of this publication does not allow for a full description of all operations for disassembling/assembling the engines installed on the models described in this Manual. Therefore, the following sections provide a list and procedure for performing only the main, most frequently performed during maintenance and current repairs, operations. Some operations are quite simple and are constantly repeated during work - in some cases, their description is omitted.

Note: Due to constant modification of the vehicle design, including engines, some deviations from the procedures described below are possible. In this case, elementary ingenuity is required to dismantle/install parts or units - carefully inspect them and determine which additional elements need to be disconnected beforehand or what prevents their dismantling. It is unlikely that new options will be fundamentally different from those described.

List of repair works performed without removing the engine from the car (Maintenance and current repairs)

7. The following repairs can be performed without removing the engine from the vehicle:

• a) Compression check;
• b) Removing and installing the timing cover;
• c) Removing and installing the timing belt cover;
• d) Removal and installation of timing drive components (belt/chain, gears/sprockets);
• e) Removal and installation of camshafts and tappets;
• f) Adjusting valve clearances (diesel engines Z19DT and Y30DT);
• g) Removing and installing the cylinder head;
• h) Removing and installing the oil pan;
• i) Removing and installing the oil pump;
• j) Removing and installing the oil cooler (with appropriate equipment);
• k) Replacement of crankshaft and camshaft seals;
• l) Checking the condition and replacing the powertrain suspension supports;
• m) Removal, condition check and installation of the flywheel/drive disk.

Text was copied from the portal: www.OpelBook.ru

8. Before starting work, thoroughly clean the engine compartment and the outer surfaces of the power unit using one of a wide range of special solvents. This treatment will prevent dirt from getting inside the engine.

9. If necessary, depending on the nature of the upcoming work, you can remove the hood to ensure free access to the components to be serviced; to avoid accidental damage to the paintwork, cover the car fenders with special covers or simply old blankets.