Specifications
Audi Allroad vehicles are equipped with V-shaped 6-cylinder diesel engines with a volume of 2.5 liters.
The cylinder blocks are cast from grey cast iron, and the cylinder heads are made from a light metal alloy and are bolted to the blocks. Each cylinder has two intake and two exhaust valves, and each cylinder block has two camshafts.
The timing belt drives the gas distribution mechanism drives the camshafts of the intake valves, which, by means of gears, drive the camshafts of the exhaust valves. The fuel pump drive of the distribution type is performed by a separate toothed belt.
The crankshaft rotates in five main bearings. The axial clearance of the crankshaft is adjusted by thrust half rings located on the journal of the fourth main bearing (see illustration 1.0).
The intake and exhaust valves of all engines are actuated by camshaft cams via hydraulic tappets, which automatically adjust the valve clearances and keep them constant. For this reason, valve clearance adjustment is not required during vehicle maintenance.
The engine has liquid cooling. It should be remembered that the engine cooling circuit must be filled with cooling liquid all year round, which is a mixture of the appropriate concentrate (antifreeze) with anti-corrosion additives and distilled water.
These engines use a cross-flow design, where air enters the cylinders on one side and exhaust gases are discharged on the opposite side.
The engine is lubricated by an oil pump located in the oil pan. The oil pump is driven by a chain from the crankshaft.
The oil pump drive chain is also used to drive the balance shaft, which reduces unwanted vibrations in the engine.
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