During operation, tar deposits from crankcase gases accumulate in the crankcase ventilation system

These deposits make it difficult to remove crankcase gases into the engine cylinders for combustion

In this regard, the pressure of the gases inside the engine rises, and oil leaks through the seals

To prevent this from happening, you need to periodically clean and flush the crankcase ventilation system

Preparing the car for the task

Removing the decorative casing of the car, as indicated in the article "Removing the decorative casing and mudguard of the Mazda 6 car engine"

How to clean a Mazda 6 crankcase ventilation systemHow to clean it Mazda 6 crankcase ventilation system

Disconnect one end of the crankcase ventilation system tube from the fitting of the cylinder head cover

Disconnect the other end from the air supply hose and remove the crankcase ventilation tube

Remove the cylinder head cover, described in the article "How to replace the Mazda 6 cover and cylinder head gasket"

How to clean a Mazda 6 crankcase ventilation systemHow to clean it Mazda 6 crankcase ventilation system

Remove the old cylinder head cover gasket

We wash the oil deflectors, the inner surface of the cylinder head cover and its pipe with gasoline

How to clean a Mazda 6 crankcase ventilation system

Set aside the intake manifold

How to clean a Mazda 6 crankcase ventilation systemHow to clean it Mazda 6 crankcase ventilation system

We squeeze the bent antennae of the hose clamp, slide the clamp along the hose and disconnect the hose from the oil separator valve and remove the intake manifold

How to clean a Mazda 6 crankcase ventilation systemHow to clean it Mazda 6 crankcase ventilation system

We unscrew the eight bolts securing the oil separator to the cylinder block

Remove the oil separator

How to clean a Mazda 6 crankcase ventilation system

The gasket must be replaced each time the oil separator is removed

How to clean a Mazda 6 crankcase ventilation systemHow to clean it Mazda 6 crankcase ventilation system

Press the valve ring holders with a screwdriver

How to clean a Mazda 6 crankcase ventilation systemHow to clean it Mazda 6 crankcase ventilation system

Remove the valve fixing ring and remove the valve from the oil separator

How to clean a Mazda 6 crankcase ventilation system

Rinse the valve and oil separator with gasoline

Checking the valve

Install all parts in reverse order