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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.

Key Benefits

The belt will never slip as the alternator is held firmly in place. It helps reduce belt dust on alternators under 70 amps. Eliminating slippage greatly increases belt life. Simple replacement bolt on – no additional brackets, 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 up grade kits. See video


This device is only recommended on alternators up to 70 amps. For higher amperage alternators this devices needs to be combined with our serpentine pulley upgrade kit manufactured by Electromaax for your specific Yanmar engine.