Description
The Engineered Marine Products MerCruiser Alpha One Power Trim Cylinder Seal Kit is a premium, professional-grade repair assembly meticulously engineered to satisfy the highest quality and performance expectations of boaters nationwide. Over extended seasons of freshwater or saltwater submersion, internal hydraulic seals naturally flatten, crack, and dry out—causing sluggish trim response and dangerous tilt bleed-down. Manufactured by Engineered Marine Products (EMP) using cutting-edge technologies and high-tolerance industry standards, this comprehensive kit provides an honest, reliable quality you can rely on to get your vessel safely back on the water.
Forged with precision from high-strength, durable materials, every O-ring, spacer, and seal inside this pack delivers robust wear resistance and superior performance under extreme load changes. It functions as the definitive aftermarket replacement solution for part number MerCruiser 25-87400A2, which is now obsolete from the original manufacturer. Built to withstand the worst sea conditions and harsh marine hydraulic fluids, this kit comes complete with every single seal needed to successfully reseal one trim ram, preventing aggressive salt crystals, sand particles, and destructive water intrusion from scoring your internal cylinder walls.
At The Outdoor Warehouse, we’re dedicated to helping boaters find the strongest, trail-proven fluids, parts, and accessories for their marine gear. Every product is backed by real-world testing for temperature stability and anti-wear protection—meeting or exceeding stringent OEM standards. From shallow-water anchor accessories to specialized transom rebuild kits, we carry trusted brands built to keep you connected. With expert support and fast U.S. shipping, we help you launch with total confidence.
Technical Performance Features:
- Complete Single-Ram Refresh: Bundles all high-pressure O-rings, back-up washers, and specialized internal hydraulic seals needed to safely rebuild one leaking trim cylinder.
- Robust Wear Resistance: Heavy-duty, chemical-resistant elastomeric materials combat high operating temperatures, UV rays, and aggressive marine hydraulic fluids.
- Direct OEM Cross-Reference: Meticulously calibrated to serve as an exact, high-tolerance replacement swap for the obsolete MerCruiser 25-87400A2 blueprint.
- Eliminates System Bleed-Down: Restores full internal pressure containment, stopping your sterndrive from creeping down while running at high speeds or trailering.
- Watertight Shielding: Wiper seals prevent abrasive debris from passing the end cap threads and disrupting smooth cylinder mechanics.
Ideal For: Marine mechanics, boat operators, and DIY enthusiasts performing a hydraulic tilt/trim ram overhaul or seasonal outdrive maintenance.
Drive Compatibility: Universally fits standard MerCruiser Alpha One and legacy outdrive hydraulic trim cylinders utilizing the 25-87400A2 seal footprint.
Specifications: SKU: 58-08211 | UPC: 840080485096 | Weight: 0.03 LBS | Brand: EMP
Highly regarded by professional boat builders and marine technicians nationwide, this premium seal kit extends the operating life of your hydraulic lift systems. Complete your regular outdrive overhaul by pairing this rebuild kit with premium marine hydraulic fluids and high-pressure line fittings available right here at The Outdoor Warehouse.
Explore more gear for your next adventure in our related collections:
- Fishing Gear
- Boating & Marine Supplies
Visit our Learning Center or explore the Fishing Learning Center for expert outboard trim rebuilding guides, hydraulic system bleed charts, and preventative boat maintenance tips.
Available now at The Outdoor Warehouse — backed by expert support, fast U.S. shipping, and trusted by outdoor professionals nationwide.
Mechanic’s Note: Because MerCruiser outdrives operate on a dual hydraulic ram system, it is highly recommended to purchase two (2) kits to rebuild both cylinders simultaneously to ensure even pressure distribution and prevent secondary seal failures.
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