Yanmar Belt TensionerTo further enhance the performance of our line of high output alternators, we now offer a belt tensioning device specifically for Yanmar JH, YM, QM, GM and HM Series of marine engines (please specify your engine model when ordering). 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
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