The Volvo Penta D4/D6 belt tensioner kit - 3847481 is a set of high-quality parts designed specifically for use with Volvo Penta D4 and D6 engines. The kit consists of an upgraded tensioner roller and a tensioner for the V-belt, which are designed to maintain optimum tension on the V-belt to extend the life of the belt and optimise engine performance. The tensioner roller is made of a high-quality material that is resistant to wear and corrosion, providing durability and long maintenance intervals. The tensioner is designed to maintain constant tension on the belt and ensure even load distribution on the V-belt. This kit is easy to install and is suitable for Volvo Penta D4 and D6 engines built after 2005. It is an essential part of engine maintenance and is ideal for boats and other craft that are used regularly and require frequent maintenance. The kit is available from authorised Volvo Penta dealers and comes with a 12-month warranty.