Balmar Pulley Kit for Yanmar 6LY, 6LYA-STP, 6LY2-STP - 48-YSP-6LY-A
Manufacturer Part #: 48-YSP-6LY-A
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Balmar Pulley Kit for Yanmar 6LY, 6LYA-STP & 6LY2-STP Engines – 48-YSP-6LY-A
The Balmar Pulley Kit for Yanmar 6LY Series Engines (48-YSP-6LY-A) is a precision-engineered marine pulley upgrade designed to support high-output alternator installations on Yanmar 6LY, 6LYA-STP, and 6LY2-STP diesel engines. This kit allows safe, efficient power transfer when upgrading to Balmar’s high-performance alternators and charging systems.
Specifically developed to handle the increased loads of high-amp alternators, this pulley kit improves belt grip, alignment, and durability compared to standard factory pulley configurations. It helps reduce belt slippage, vibration, and premature wear—common issues when adding higher output charging systems to marine diesel engines.
Manufactured from marine-grade, corrosion-resistant materials, the Balmar pulley kit is built for long service life in harsh engine room environments. It is engineered for precise fitment on Yanmar 6LY-series engines, ensuring proper alignment and reliable operation. Ideal for cruising, commercial, and offshore vessels, this kit is an essential component when upgrading onboard electrical systems.
Key Performance Benefits
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Eliminate Belt Slippage: The 6-groove K6 serpentine design provides vastly superior grip compared to traditional V-belts.
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Higher Amperage Support: Required for stable operation of alternators 100 amps and higher to prevent "black dust" and premature belt failure.
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Precision Machined: Constructed from high-quality materials to ensure perfect balance and alignment on Yanmar 6LY series crankshafts and water pumps.
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Extended Service Intervals: Serpentine belts run cooler and last longer than V-belts, reducing the frequency of maintenance and tension adjustments.
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Quieter Operation: Significantly reduces the "squeal" and vibration common in high-load V-belt systems.
Compatibility
| Category | Details |
| Engine Models | Yanmar 6LY, 6LYA-STP, 6LY2-STP |
| Pulley Type | K6 Serpentine (6-Groove) |
| Alternator Match | Balmar 6-Series, XT-Series, and 94-Series |
| System Voltage | Compatible with 12V and 24V systems |
In The Box
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1 x Crankshaft Pulley: Precision-machined serpentine drive pulley.
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1 x Water Pump Pulley: Matching serpentine pulley for the cooling system.
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1 x Alternator Pulley: K6 pulley (if not already pre-installed on your alternator).
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2 x High-Quality Serpentine Belts: Includes a primary belt and a dedicated spare for your onboard kit.
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Mounting Hardware: All necessary bolts, washers, and spacers for installation.
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Installation Instructions: Detailed guide for Yanmar 6LY engine configurations.
Is this for a new high-output alternator installation?
If you haven't selected an alternator yet, I can recommend the best Balmar XT-Series or 94-Series model that integrates perfectly with this 6LY pulley kit. Would you like to see those options?
The Balmar Pulley Kit for Yanmar 6LY, 6LYA-STP & 6LY2-STP Engines – 48-YSP-6LY-A is a critical upgrade for boat owners looking to safely and efficiently increase alternator output while maintaining long-term engine and belt reliability.
This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.
Manufacturer : Balmar
Manufacturer Part No : 48-YSP-6LY-A
UPC : 676205510134
Balmar Pulley Kit for Yanmar 6LY, 6LYA-STP, 6LY2-STP - 48-YSP-6LY-A is backordered and will ship as soon as it is back in stock.
Balmar Pulley Kit for Yanmar 6LY, 6LYA-STP, 6LY2-STP - 48-YSP-6LY-A
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