| 1. Disconnect a vacuum pipe from the pump and instead of it connect the vacuum gauge. |
| 2. Start the engine in an idling mode. |
| 3. Measure the vacuum created by the pump. After 1 minute of work of the engine the vacuum should make about 500 mm. Hg If the vacuum created by the pump, does not correspond to the demanded data, replace the pump completely since spare parts to the pump are not delivered. |
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