***Must be used with our Serpentine Pulley Kit ***
The Yanmar belt tensioner enhances the performance of a high-output alternator, like the Cruiser and GenMAAX line of Saddle Mount (SM) alternators. Specifically for Yanmar JH Series of marine engines, the tensioner is a simple device that eliminates the need to tension the belt using a rod or screw driver.
This belt tensioner lets you easily achieve the perfect belt tension for your Yanmar engine.