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 | 1. Remove from the valve a hose and take the valve of ventilation of a case from a cover, then repeatedly connect a hose. |  
 | 2. At operation of the engine idling establish a finger on the valve of ventilation of a case and check depression existence. If depression is absent, check a hose or valve condition. |  
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  | 3. Switch off the engine and remove the valve of ventilation of a case from a hose. Blow the valve from a head of the block of cylinders. If air does not pass at valve blowing off, replace the valve.  |  |