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The air intake system is an important component of your diesel engine and if it becomes partially blocked can cause serious problems with performance, increase fuel consumption and damage to important components. In modern diesel engines there are two emission control processes that have been implemented:
1. Closed Crankcase Ventilation (CCV) - Crankcase gases are piped to the air intake system so that they are not released into the air that we breathe, this gas contains oil mist and water in the form of vapour.
2. Exhaust Gas Recirculation (EGR) - In the EGR process some exhaust gases are piped to the air intake system, this modifies the combustion process thereby lowering Nitrous Oxide emissions produced.
Due to these processes we now have both crankcase ventilation gases (oil mist and water) from CCV and hot exhaust gases containing carbon (soot) from EGR - mixing together in the air intake system. If the exhaust gas alone was piped to the intake manifold it would not normally collect on the walls of the manifold because it is dry. If crankcase gases alone were entering the manifold, again there wouldn’t be a problem. However, when the oil mist mixes with the soot particles from the exhaust gases a mixture is produced that attaches to the walls of the intake manifold. These combined deposits build up over time to a point where they severely restrict the flow of air, blocking the inlet manifold and valves, causing reduced performance and fuel efficiency.
Removing the deposits involves disassembly of the intake system from the engine, this is both time consuming and expensive. By installing an Oil Mist Separator, often called a Catch Can, the oil mist and water vapour are substantially removed from the combination thereby taking away the ingredient that allows the soot to stick. The result is that the build-up of deposits is GREATLY reduced.
