General description (Opel Ascona C)

The models in question have a 4-cylinder in-line engine with an overhead camshaft, mounted transversely at the front of the car.



The crankshaft rests on 5 main bearings. To control the axial movement of the crankshaft, there are thrust washers on both sides of the central main bearing.



The connecting rods are attached to the crankshaft via horizontally detachable connecting rod bearings. The connecting rods are attached to the pistons by piston pins, which have a fixed fit in the connecting rods. The aluminum alloy pistons are equipped with 3 piston rings: two compression rings and one oil scraper ring.

The camshaft is driven from the crankshaft by a composite rubber toothed belt. The valve movement is controlled by rockers, which rest at their pivot end on self-adjusting hydraulic tappets (thus, valve clearance adjustment is not required). The intake and exhaust valves move in guide bushings pressed into the cylinder head.

The engine is lubricated using a gear pump located in the front part of the cylinder block. The oil pump is driven by the crankshaft, while the fuel pump (on carburetor models) and the distributor are controlled by the camshaft.