Yanmar Belt Tensioner and Idler Pulley

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Our Yanmar belt tensioner arm, when combined with our idler pulley, will substantially enhance the overall performance of our cruiser and Gen-maax line of marine alternators which are simple bolt on replacement high performance alternators specifically designed for your Yanmar marine engine.

Yanmar belt tensioner and Idler pulleyNo additional brackets are needed as this idler pulley is a universal fit on most Yanmar marine engines. It fits under plastic belt cover and adds extra flexibility along belt’s length. Perfect when the raw water pump is resident on the front lower right-hand side of the engine. The extra belt wrap on both the alternator and crank pulleys allows for a greater alternator upgrade, whilst keeping the belt in perfect tension and away from the water pump. Greatly enhanced when installed with an Electromaax serpentine pulley upgrade kit.

With the turning of a bolt you’ll gain the perfect level of belt tension for your Yanmar engine, and if you combine our tensioner with the included Gates Green Stripe XL V-Belt you’ll easily increase the reliability of your charging system.

Key Benefits

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.
Yanmar belt tensioner and idler pulley installed on Yanmar engine

  1. substantially reduced slippage
  2. alternator is held firm in place
  3. eliminates any belt dust
  4. greatly increased belt life
  5. no additional brackets needed
  6. universal fit on most Yanmar marine engines
  7. fits under plastic belt cover
  8. engine runs quieter
  9. added flexibility along belt’s length
  10. greater lateral stability
  11. belt runs cooler, quieter and with less bending stress
  12. precision V-forming process assures exact size and angle control
  13. high tenacity tensile cords
  14. special layer of reinforcement
  15. maintenance-free performance

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.

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Yanmar Belt Tensioner and Idler Pulley
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