| 1. Launch the engine and warm up it up to the normal working temperature. |
| 2. Leave the engine to work with idling rotation frequency. |
| 3. Disconnect a hose of ventilation of a case from a cover of a head of the block of cylinders. |
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4. A finger close a hose of ventilation of a case. |
| 5. Make sure that in a hose depression is felt. |
| 6. Remove the valve of ventilation of a case. |
| 7. Blow the valve from outside And, at the same time from outside In there has to be an air. |
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8. Blow the valve from outside In, at the same time from outside But there should not be an air. |
| 9. If necessary replace the valve. |
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