{"product_id":"enerdrive-b-48-ysp-3ym-b","title":"Balmar AltMount Yanmar 3YM30 Serpentine Pulley Conversion Kit","description":"\u003ch2\u003eHigh-Output Alternator Upgrade Solution for Marine Diesel Engines\u003c\/h2\u003e\u003cp\u003eUpgrading your vessel's electrical system with a high-output alternator or a lithium house battery bank places substantial physical load on the engine's drive belt system. Standard factory V-belts are typically engineered for lower-amperage factory alternators and frequently fail to handle the increased mechanical resistance of modern high-capacity charging systems. The Balmar AltMount serpentine pulley conversion kit provides a dedicated mechanical upgrade for the Yanmar 3YM30 marine diesel engine, replacing the standard belt configuration with a robust, multi-ribbed ten-groove (J10) serpentine drive system.\u003c\/p\u003e\u003ch3\u003eWhy Upgrade to a J10 Serpentine Drive System?\u003c\/h3\u003e\u003cp\u003eWhen high-output alternators demand significantly more horsepower from the engine crankshaft, traditional single V-belts often suffer from slippage, rapid wear, and excessive belt dust inside the engine room. A ten-groove J10 serpentine belt offers a much larger surface area for contact across the pulleys, allowing greater load transfer than a single V-belt.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine-Specific Engineering:\u003c\/strong\u003e Designed specifically for Yanmar 3YM30 diesel engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior Grip and Power Transfer:\u003c\/strong\u003e Ten-groove (J10) pulley architecture maximises belt-to-pulley contact to support high-output alternator charging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternator Compatibility:\u003c\/strong\u003e Balmar designs AltMount kits for its 6-Series and XT-Series alternators. Balmar notes that an older AT-200A alternator may need a longer belt.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmoother Running:\u003c\/strong\u003e Balmar states AltMount kits improve load transfer while reducing engine noise and vibration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOffshore Redundancy Included:\u003c\/strong\u003e Supplied with two 39-inch (approx. 991mm) J10 serpentine belts so you immediately have a dedicated spare onboard for extended cruising.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Hardware Package:\u003c\/strong\u003e Includes three J10 pulleys and the required mounting hardware. Installation fastens a conversion pulley over the existing crank pulley and replaces the water pump pulley.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eMinimise Risk and Protect Your Marine Charging System\u003c\/h3\u003e\u003cp\u003eAttempting to run a high-output marine alternator on an under-spec belt drive risks premature belt failure, which not only halts battery charging but can also disable your engine's cooling water pump. Furthermore, mismatched aftermarket pulleys can introduce subtle alignment errors that rapidly destroy alternator bearings and water pump seals. Because the Balmar AltMount kit is engineered as a matched system for the Yanmar 3YM30, it mitigates the risk of misalignment and mechanical breakdown while motoring in demanding offshore conditions. Balmar recommends that every AltMount kit is installed by a qualified professional.\u003c\/p\u003e\u003ch3\u003eUpgrade Your Engine Drive Today\u003c\/h3\u003e\u003cp\u003eEquip your Yanmar 3YM30 with the mechanical reliability required to support high-capacity marine charging by adding the Balmar AltMount Serpentine Pulley Conversion Kit to your system setup.\u003c\/p\u003e","brand":"Balmar","offers":[{"title":"Default Title","offer_id":43629756579901,"sku":"B-48-YSP-3YM-B","price":1386.87,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0602\/3918\/3933\/files\/balmar-yanmar-3ym30-serpentine-pulley-kit-b-48-ysp-3ym-b.png?v=1792490856","url":"https:\/\/www.solar4rvs.com.au\/products\/enerdrive-b-48-ysp-3ym-b","provider":"Solar 4 RVs","version":"1.0","type":"link"}