With the turning of a bolt you’ll gain the perfect level of belt tension for your Yanmar engine. This system works best when both devices are combined with one of our many Yanmar serpentine pulley upgrade kits.
The Yanmar belt tensioner combined with the idler pulley is only recommended on marine alternators up to 100 amps. This device also needs to be combined with one of our serpentine pulley upgrade kits, specifically for higher amperage alternators and it is specifically manufactured for Yanmar marine engines only.
* Readers note: in order for you to achieve the above key benefits of the Yanmar belt tensioner and idler pulley, your belt must be installed and tensioned properly, according to instructions provided you.