{"product_id":"enerdrive-altmount-serpentine-pulley-conversion-kit-for-yanmar-3jh5-3jh4-e-4jh4-e-4jh5-4jh5-e","title":"Enerdrive AltMount Serpentine Pulley Conversion Kit for Yanmar 3JH5, 3JH4-E, 4JH4-E, 4JH5, 4JH5-E","description":"\u003ch2\u003eAltMount® Serpentine Pulley Conversion Kit for High-Output Marine Alternators\u003c\/h2\u003e\u003ch3\u003eReliable Power Transmission for Yanmar 3JH and 4JH Series Diesel Engines\u003c\/h3\u003e\u003cp\u003eUpgrading your marine electrical system with a high-output alternator requires a drive system capable of handling the increased mechanical load. Standard V-belts are prone to slipping, stretching, and shedding destructive black belt dust when subjected to the heavy torque demands of modern lithium (LiFePO4) or large AGM battery banks. The \u003cstrong\u003eAltMount® Serpentine Pulley Conversion Kit\u003c\/strong\u003e provides a robust engineering solution designed specifically for select \u003cstrong\u003eYanmar marine diesel engines\u003c\/strong\u003e, including the 3JH5, 3JH4-E, 4JH4-E, 4JH5, and 4JH5-E models.\u003c\/p\u003e\u003cp\u003eBy converting your factory V-belt setup to a modern ten-groove (J10) serpentine belt system, this kit significantly increases the surface contact area between the belt and the pulleys. This enhanced grip maximises power transmission efficiency, eliminates belt slippage, and reduces the radial load on both your engine's water pump bearings and your alternator's internal components.\u003c\/p\u003e\u003ch3\u003eEngineered for Harsh Marine Environments\u003c\/h3\u003e\u003cp\u003eMarine engine bays present unique challenges, from constant vibration to corrosive salt air. Unlike standard automotive components that quickly degrade at sea, the AltMount® system is purpose-built for longevity in demanding off-grid and marine applications. Each kit features three precision-machined, blue anodised aluminium pulleys that resist corrosion while maintaining strict tolerances for smooth, balanced operation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTen-Groove (J10) Serpentine Design:\u003c\/strong\u003e Delivers superior grip and torque transfer to support high-amperage alternators without slipping.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision-Machined Anodised Pulleys:\u003c\/strong\u003e Includes three custom-engineered pulleys (crankshaft, water pump, and a 17 mm alternator rotor shaft pulley) built to resist wear and marine corrosion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Redundancy Included:\u003c\/strong\u003e Supplied with two heavy-duty 44.5\" (approx. 1.13 m) circumference J10 serpentine belts, giving you an immediate onboard spare for peace of mind during remote cruising.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComprehensive Installation Hardware:\u003c\/strong\u003e Comes complete with high-tensile mounting bolts, Loctite 242 threadlocker for vibration resistance, and Tef-Gel anti-corrosion lubricant to prevent galvanic seizure between dissimilar metals.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Supersession:\u003c\/strong\u003e Directly replaces previous kit versions 48-YSP-3JH-B, 48-YSP-4JH-C, and 48-YSP-4JH-A.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWhy Upgrade to a Serpentine System?\u003c\/h3\u003e\u003cp\u003eWhen a standard 12V or 24V alternator is working at full capacity, it places immense physical drag on the engine belt. Standard belts often require frequent re-tensioning and premature replacement under these conditions. Switching to an AltMount® J10 serpentine conversion kit solves these common failure points:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEliminates Belt Dust and Squeal:\u003c\/strong\u003e Proper engagement prevents the friction that causes annoying belt squeal and coats your engine room in fine rubber dust.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProtects Engine Bearings:\u003c\/strong\u003e Serpentine belts transfer power efficiently with less tension than V-belts, reducing side-load stress on expensive water pump and alternator bearings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproves Charging Consistency:\u003c\/strong\u003e By preventing slippage, your alternator spins at the optimal RPM, ensuring your batteries receive their full rated charge current faster and reducing overall engine run time.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eComplete Your Marine Charging Upgrade\u003c\/h3\u003e\u003cp\u003eWhether you are fitting a high-output Balmar alternator or upgrading your vessel's off-grid energy capacity for extended passages, a reliable mechanical drive is essential. Upgrade your Yanmar engine with the AltMount® Serpentine Pulley Conversion Kit today to ensure efficient, trouble-free power generation on the water.\u003c\/p\u003e","brand":"Enerdrive","offers":[{"title":"Default Title","offer_id":43629756547133,"sku":"B-48-YSP-3JH-A","price":1431.14,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0602\/3918\/3933\/files\/yanmar-engine-pulley-kit-b-48-ysp-3jh-a.png?v=1792907250","url":"https:\/\/www.solar4rvs.com.au\/products\/enerdrive-altmount-serpentine-pulley-conversion-kit-for-yanmar-3jh5-3jh4-e-4jh4-e-4jh5-4jh5-e","provider":"Solar 4 RVs","version":"1.0","type":"link"}