General information
Engine - 4-cylinder, in-line with one or two overhead camshafts (depending on the model), mounted transversely on the front side of the vehicle.
The crankshaft rotates in five armored bearings, the central bearing has liners with thrust washers to ensure the required axial clearance.
Connecting rods are attached to the crankshaft by armored connecting rod bearings. On models with a single overhead camshaft (SOHC), the pistons are attached to the connecting rods by piston pins, which are fixed in the opening of the upper connecting rod head. The pistons are made of aluminum alloy and have three rings: two compression rings and one oil-removing ring.
The camshaft on SOHC engines is driven from the crankshaft via a toothed belt. There are two valves per cylinder (one inlet and one outlet), controlled via rocker arms supported on the pivot axis, by hydraulic self-adjusting tappets.
The intake and exhaust valves are closed by a single spring and move in guides that are pressed into the cylinder head.
The gear-type oil pump is housed in a housing attached to the front of the cylinder block and is driven directly by the crankshaft. The lubrication system uses a full-flow oil filter.
The distributor is driven directly from the camshaft. On carburetor models, a mechanical fuel pump is driven from the front end of the camshaft. The coolant pump is located on the front side of the cylinder block and is driven by a toothed drive belt.
IN Section 2A describes repair procedures for the SOHC engine Many of the procedures and specifications for the DOHC engine are similar to those described for the 2.0L SOHC engine. However, procedures that do not match are detailed in Section 2B.
[Original source on the website opelbook]
Engine Identification Codes
Before ordering parts or performing any engine repair or overhaul, it is important to accurately determine the engine type. Later engines are similar in appearance but often have significant differences in repair procedures, even though they may have the same displacement and model year.
The subchapters in this Section generally indicate the type of engine on which the operations are performed. First check the engine code, which is located on a horizontal surface on the exhaust manifold side of the cylinder block. On later model engines, the code is located on the flange connecting the cylinder block to the transmission, next to the engine oil dipstick.
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