Engine Breather Filter

Crankcase ventilation

For environmental and public health reasons, emission standards for diesel engines in construction, agricultural, marine and passenger vehicles are becoming increasingly stringent. While modern engines are required to emit cleaner exhaust gases, the same applies to crankcase emissions. These emissions consist mainly of flue gases, which come from small leaks (blow-by) in the piston rings. Once released into the crankcase, these gases become loaded with oil and pose a risk to the engine by generating excessive pressure and contributing to oil consumption. It is therefore essential that the crankcase is well ventilated.

How does the crankcase ventilation work?

In the past, these gases were discharged directly into the ambient air, but today they are returned to the air intake manifold after being filtered. By separating oil particles and impurities from the blow-by gases, the engine breather filter prevents unburnt from mixing with the engine oil and reduces pressure in the crankcase that could damage the seals that seal the lubrication system. The filtered oil from the mist is then returned directly to the crankcase. This closed-loop process reduces emissions and oil consumption in the engine.

How a breather filter works for a modern
diesel engine

  • Oil-laden exhaust gases (blow-by) enter the filter
  • A coalescing media retains the oil particles
  • Oil particles fall back into the crankcase
  • Purified gas is returned to the intake manifold

Key Benefits of Changing the Breather Filter

The Engine Breather filter is Often missed or overlooked when servicing an engine,  H and H Agriculture recommends when servicing an engine to check , Clean or replace engine breather filter

  • Lowers Crankcase Pressure: Relieves gases leaking past piston rings so they do not blow out gaskets or main engine seals.
  • Protects the Turbocharger: Keeps excessive pressure from forcing oil past the turbocharger seals.
  • Stops Oil Leaks: Prevents blocked filters from forcing engine oil out through dipstick tubes or rubber seals.
  • Keeps Oil Clean: Filters out oil mist and carbon impurities before they degrade your engine oil quality.
  • Improves Emissions: Ensures proper recycling of crankcase gases back into the intake system without clogging component

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