The zolotnik of system of ventilation of a case is located on a cover of a head of cylinders.
Check and replacement
PERFORMANCE ORDER
1. On the heated-up engine get a zolotnik (it is specified by an arrow).
2. Idling the heated-up engine apply a finger to a zolotnik opening. Lack of depression indicates pollution of a zolotnik or hose. Replace the polluted or damaged hose.
3. Stop the engine and shake a zolotnik. If there is no knock, then replace a zolotnik.
4. For replacement disconnect a zolotnik, having remembered its orientation.