Engine

PROCEDURE

Golf and Jetta models were equipped with in-line four-cylinder, four-stroke gasoline and diesel engines. All engines have a cast iron cylinder block with a cylinder head cast from aluminum alloy. Valve guides and valve seats made of sintered steel are pressed into the cylinder head. The camshaft located in the cylinder head is driven by a toothed belt. In 1.1 and 1.3 L engines the camshaft rotates on three bearings, and in 1.6 and 1.8 L engines it rotates on five bearings. Pistons are cast from aluminum alloy with steel inserts in the most heavily loaded areas. Each piston has two compression rings and one oil control ring. Connecting rods are forged steel with an I-beam section. A bushing into which the piston pin is inserted is pressed into the small end of the connecting rod. Thin-wall connecting rod bearing shells are installed in the big end. The connecting rod cap is secured with two bolts. The crankshaft is forged steel and rotates on five plain bearings.

The main bearing shells are thin-wall, with lubrication grooves.

On NK engines the oil pump is located at the end of the crankshaft. On other 1.1 and 1.3 L engines the oil pump is installed in the front of the cylinder block and driven by a chain; on 1.6 and 1.8 L engines it is driven by an intermediate shaft. The oil filter is a full-flow, replaceable type located in the lower part of the cylinder block. The engine cooling system is liquid-cooled with a thermostat and an expansion tank. Coolant circulates under pressure created by a centrifugal pump. The pump is installed in the front of the cylinder block and driven by a toothed belt on 1.1 and 1.3 L engines or by a V-belt on 1.6 and 1.8 L engines. The cooling system radiator is aluminum with plastic tanks. On gasoline engines the fuel system uses either a two-barrel carburetor or fuel injection.