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Increase Performance with a Serpentine Pulley Upgrade Kit

Available for Yanmar, Volvo, Nanni and More!


Serpentine Pulley Upgrade Kits are a permanent solution to belt dust buildup on your boat engine. Pulley Upgrade Kits available for Yanmar, Volvo, Nanni, Perkins, Westerbeke, Universal and more!

Finally there’s a permanent solution to belt dust buildup on your engine and more importantly you can now substantially increase the output of your alternator without the fear of damaging your engine or electrical system – quite the contrary – you can now put the required load on your engine, when charging at idle, when on the hook.

ElectroMaax pulley kits are used in conjunction with our High-Output Marine Alternators ranging from 100 to 250 amps.

Watch an ElectroMaax marine alternator and pulley kit installation below

Most Name Brand Alternators Fit

We have developed Serpentine (multi grooved) Pulley Upgrade Kits for most Yanmar marine engines from the mid 1970s and all current models. In addition, we have also developed a tensioning-arm for all JH, GM, QM and YM Yanmar series engines and most Nanni marine engines. This simple device makes tensing the belt easy, no need for screw drivers or large wooden sticks to help position the alternator and can be purchased separately. Kits for other popular brands of marine engines are either available or are currently under development.

How will these serpentine pulleys benefit you?

Firstly you will eliminate the build up of fine belt dust that penetrates vulnerable engine and electronic components. NOW you are able to drive a high output alternator that actually allows you to run the engine at idle as it (the alternator) creates load that keeps the engine in good fettle without damage to the engine. If you have the space you can also add a second alternator to further enhance your engine life. Click here to watch a brief customer testimonial on our serpentine pulley kits.

Nearly Triple Your Amperage!

While a gallon of diesel at a marina is now $5.00 dollars plus, if you reduce this by 60% when running the engine to charge the batteries, what will you save? Most of our customers say it paid for itself within months, more importantly the piece of mind it gave them was priceless.

Increases the vessels range

Our Serpentine Pulley Kits increase the vessel's rangeFor those of us who cruise, the reduction of fuel consumption has a more significant value than just financial savings, it dramatically increases the range of our boat which keeps us cruising longer and allows us to stay in pristine spots when other cruisers have to leave due to refueling.

What do you think that belt dust is?

Well it’s your single-V-belt disintegrating due to slippage, why do you think the auto industry switched to serpentine 30 plus years ago?

Eventually the belt snaps (never on the dock) normally at sea when the engines hot and the sea is rough. The end result could be serious damage to your engines systems. Industrial 10 groove serpentine belts do not slip, and consequently they do not wear, and one belt will typically last the life of the engine so you typically will never need to buy a new one!

Your current single-V-belt concentrates the tension in one small area on the pulley, which stresses the bearings, the serpentine spreads the stress over three times this area running smoother (without belt slippage ) and quieter which helps to further preserve the life of your engine.

ElectroMaax optimum charging solutions are designed and manufactured in Canada with top-quality materials.

We use a serpentine 10-rib belt ( as in all automotive vehicles) in place of the single-V belt or double-V, for improved performance and reliability:

  • Wide serpentine 10-rib belt – Smooth, better traction for improved output
  • Machined 6061 aluminum structure – Light and strong
  • Anodized type II – corrosion prevention
  • Grade 8 and 10.9 zinc plated flange head bolts and nuts– quality and function

Installation instructions for installing our serpentine pulley kit on your engine.

Installation instructions for installing our 160 Amp Alternator with our Yanmar 4JH3E, 4JH3TE, 4JH3HTE pulley kits.

Request More Info

Request more information about our Serpentine Pulley Upgrade Kits by filling out the form below. We will reply to your message promptly.

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