Genuine factory original equipment John Crane Brand EY heavy-duty industrial marine propulsion stern tube shaft seal component assembly (Model / MPN: EY Seal Assembly | Part Number: H71833 / Set 15). This premium water-lubricated propulsion component safeguards your vessel's running gear and inboard engine systems by maintaining exact shaft centering while dampening operational drivetrain vibrations. Featuring a precision-engineered cartridge interface profile, it installs easily right onto your heavy-duty marine propulsion shafts or primary water distribution systems. Sourced from highly durable elastomeric composites and precision-ground face materials, this mechanical seal assembly provides ultra-smooth face contact and micro-finishing, protecting delicate stern bearings and high-strength components from dangerous friction-induced heat damage or surface glazing under rigorous continuous operational stress.

• Key Features: Specialized multi-point sealing interface structure for precision containment, heavy-duty marine-grade configuration for extended operational life, dependable thermal dispersion to prevent face burn, and high-stability performance limits.
• Technical Specs: Brand: John Crane | Line: Marine EY Seal Series | Part Number / MPN: H71833 | Configuration / Size Profile: Set 15 | Sealing Matrix: High-Performance Composite & Elastomer Assembly | Housing Style: Marine/Industrial Heavy-Duty Service.
• Condition Notes: This item is in new, old stock (NOS) warehouse condition. The product sealing faces, O-rings, and primary retention components are physically flawless with zero edge chips, hairline cracks, structural fractures, or material compromises. The mounting core is completely clean and ready for direct installation.
• Installation Notes: Always perform a standard physical check by gently wiping the unmounted seal faces with a clean, lint-free cloth to remove warehouse dust prior to seating. Slide onto the machine spindle or shaft sleeve, ensuring the compressed safety O-rings and secondary elements are placed securely on all sides of the assembly housing. Tighten the retaining hardware firmly enough to prevent slippage or shifting without over-torquing, position your alignment markers to factory specifications, and always operate the system with adequate fluid or cooling flush for at least one minute before full commissioning. Never run the seal dry or exceed its maximum structural performance rating. Message with any questions!