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Balmar 48YSP3YMB AltMount Serpentine Pulley Conversion Kit for Yanmar 3YM30

Manufacturer

Balmar

<h3>About Balmar: Marine DC Power Since 1981</h3><p>Since its founding in 1981, <strong>Balmar</strong> has built a reputation as one of the most trusted names in marine DC power. For over four decades, the company has focused exclusively on helping sailors and power boaters solve one of the most persistent challenges on the water: keeping batteries charged reliably and efficiently. That singular focus has made Balmar the go-to choice for serious mariners who demand more from their electrical systems.</p><h3>Innovative Alternator Technology</h3><p>Balmar's greatest claim to fame is its lineup of <a href="/12782-balmar-alternators-200087">marine alternators</a> — widely regarded as the highest-output and most dependable alternators available in the recreational marine market. What sets Balmar apart is not just raw output, but smart engineering. Their patented <strong>Smart Ready&reg; Alternator</strong> technology allows the alternator to communicate directly with an external regulator, enabling precise, multi-stage charging profiles that protect batteries and extend their service life. Whether you're running a modest weekend sailboat or a fully outfitted bluewater passage-maker loaded with electronics, Balmar offers an <a href="/12782-balmar-alternator-2412">alternator</a> sized and engineered for the task.</p><p>Marine environments are uniquely demanding — salt air, vibration, and the need for long, uninterrupted charging cycles put far more stress on electrical components than typical automotive applications. Balmar designs its alternators specifically for these conditions, with robust construction and thermal management that keeps performance consistent even during extended motoring passages.</p><h3>Battery Monitors &amp; Charging System Management</h3><p>A high-output alternator is only part of the equation. Knowing the true state of your battery bank is equally critical, which is why Balmar also produces a respected line of <a href="/12782-balmar-battery-monitors-volt-meters-200146">battery monitors and volt meters</a>. These instruments give mariners accurate, real-time insight into battery voltage, state of charge, and current flow — the kind of data that prevents being stranded at anchor with a dead house bank. Balmar's monitoring products are designed to integrate seamlessly with their charging ecosystem, giving you a complete picture of your DC system's health at a glance.</p><h3>Expert Support &amp; a Legacy of Trust</h3><p>Beyond the products themselves, Balmar has long been recognized for its exceptional technical support. Marine electrical systems can be complex, and Balmar's knowledgeable team has a well-earned reputation for helping customers spec the right components and troubleshoot installations. That combination of innovative hardware and genuine expertise is a big reason why Balmar has remained a privately held, customer-focused company for over 40 years — and why the brand continues to be found aboard everything from coastal cruisers to offshore racing yachts.</p>

Part Number

48YSP3YMB
09/11/2036 2:05 AM
Sale Price

$691.98

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Product Details

The Balmar 48-YSP-3YM-B is an AltMount Serpentine Pulley Conversion Kit specifically engineered for Yanmar 3YM30 diesel engines. This patented system upgrades your engine from a traditional single vee pulley to a high-performance serpentine pulley configuration, enabling the use of Balmar high-output alternators and delivering superior power transfer efficiency.

Key Benefits:

  • Serpentine pulley provides greater surface contact between the belt and pulley, accommodating much higher PTO requirements
  • Quieter operation and virtual elimination of belt dust
  • Reduced vibration for smoother engine performance
  • Supports alternator loads exceeding 100A for 12V applications

What's Included:

  • Three Ten-Groove (J10) Pulleys
  • Two J10, 39-inch circumference serpentine belts (one spare)
  • Complete mounting hardware

The system installs by placing and fastening a conversion pulley over the existing crank pulley and replacing the water pump pulley. AltMount Pulley Kits are designed to be used with Balmar 6-Series, XT-Series and AT-Series Alternators. Note: If using an AT-200A Alternator, a longer belt length may be required.

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