What is cdr and how is it taken care of so that the mechanic does not win?

The crankcase is a very important place that is responsible for the proper operation of the engine. It includes such elements as the crankshaft, cylinders, pistons and spark plugs. A device hidden under the name CDR, that is, the crankcase pressure regulator valve, is located above the correct operation of this element of the engine. Translated into Polish, it is a vacuum control valve.

The crankcase is where the crankshaft rotates, as well as the space that surrounds the engine body from below, and is connected to the oil sump. The gearbox consists of several main components: cylinder head gaskets, bushing seats, tappet nozzles and cylinder head bolt holes.

This is where components such as the cylinder head, camshaft and oil come into play. The crankcase protects the engine starting mechanism and also provides additional cooling.

Bleeding of the crank mechanism is a fundamental problem for the proper operation of the entire system. Here, engine gases are released, the excess of which negatively affects the crankshaft and engine oil. A vacuum control valve (CDR) ensures proper operation of the crankcase. In short, it is responsible for separating the oil from the air absorbed by the engine.

The CDR system bleeds the crankcase and maintains sufficient vacuum throughout the system. Its efficient operation allows efficient discharge of exhaust gases into the intake system, thereby reducing the emission of pollutants into the environment during engine operation.

The cause of excessive pressure in the crankcase may be the accumulation of exhaust gases. You can tell this by unstable idle speed, loss of power, or even engine stalling. This is a sign of a faulty CDR and it’s time to bleed crankcase air.

This activity can only be carried out by a workshop or a mechanic with specialized equipment. You need to connect to the pneumothorax valve, which is equipped with special sensors to regulate pressure. Gases are directed through the manifold to the combustion chambers, and the remaining engine oil returns to the sump during the deaeration process.

The cost of such a service ranges from 150 to several hundred zlotys. This is an important step to prevent damage to the engine block. Ignoring the above symptoms can lead to an increase in exhaust gas pressure and subsequently a blockage of the oil sump.

The pressure that puts pressure on the walls of the case can dislodge the sealants on the bottom of the engine. Obstructed pneumothorax, in turn, can push the dipstick out, and when you unscrew it, you will hear a whistle under the hood.

A clogged CDR valve often makes itself felt in the winter. Excess moisture in the air combines with oil and sticks to the entire system, so that a few degrees of frost can block the flow into the crankcase. Therefore, it is worthwhile to take care of the proper condition of this crankcase and its serviceability in advance. This will later save you the cost of refurbishing or having to buy a new motor.