MENUCall: 716-304-8590
Marine Smart Energy logo

Electromaax Yanmar Belt Tensioner



To further enhance the performance of our SM line of alternators, we now offer a belt tensioning device specifically for Yanmar marine engines. This simple device eliminates the need to tension the belt using a stick or screw driver that requires the installer to have three arms. Now with the turning of a bolt you can easily achieve the perfect belt tension level for your Yanmar engine.  TENSIONER WILL NOT WORK ON ANY V-BELT CONFIGURATION!

Key Benefits

The belt will never slip as the alternator is held firmly in place. It eliminates slippage and greatly increases belt life. Simple replacement bolt-on, no additional brackets required, and a Universal fit on most Yanmar marine engines.  The tensioner on its own will not eliminate belt dust!

Fits under plastic belt cover, the engine runs quieter, and it’s the most effective when combined with our Serpentine Pulley Upgrade Kits. See video


For higher amperage alternators (over 70 amps) this devices needs to be combined with our Serpentine Pulley Upgrade Kit manufactured by ElectroMaax for your specific Yanmar engine.