Diesel engines — general information (VW Golf 4)

The cylinder block is made of gray cast iron, the same material used to make the engine cylinders. The cylinder head is made of light alloy and is bolted to the cylinder block. Steel guides and valve seats are pressed into the cylinder head. An oil pan is attached to the bottom of the engine cylinder block, into which the oil needed for lubrication and cooling of the engine flows.

On diesel engines, to save space, the intake and exhaust manifolds are located on the same side of the cylinder head.

The camshaft is installed in the cylinder head and is driven by a toothed belt from the crankshaft pulley. The intake and exhaust valves, installed vertically, are controlled by the camshaft cams through hydraulic tappets. To supply fuel to the cylinders of the diesel engine, a high-pressure fuel pump is used, fixed to the cylinder block and driven by a toothed belt.

Valve clearance adjustment is performed automatically using hydraulic tappets, manual adjustment is not required.

An oil pump is used to supply oil to the rubbing surfaces of the engine. Under pressure, oil is supplied to the channels to the bearings of the crankshaft and camshaft.

The original text can be found on the portal (vwmanual.ru)

The water pump is mounted on the side of the engine block. Keep in mind that the engine cooling system should be filled year-round with a mixture of antifreeze and water with low lime content.

Fuel is supplied to the engine under pressure by a high-pressure fuel pump (HPFP), which is flanged to the side of the cylinder block and driven by a toothed belt. More powerful engines are equipped with a turbocharger that uses the energy of the exhaust gases.

Warning: The radiator fan may turn on after the engine and ignition are turned off, so be careful when working on a hot engine. To prevent the radiator fan from turning on, disconnect the electrical connector from the radiator fan motor.