JAGUAR X-TYPE 2.1 2.5 3.0 V6 PETROL WATER PUMP DRIVE BELT AND TENSIONER - C2S43295 + C2S39525. Jaguar X-Type 2.1 2.5 3.0 V6 Petrol Water Pump Drive Belt and Tensioner - C2S43295 + C2S39525. The Engine Drive Belt Tensioner is a device that applies pressure to the Drive Belt to maintain the correct tension for optimum performance and to prevent slippage.