Buckshot Racing #77 now offers a high-quality complete Gearcase Seal Kit designed for Mercury 3 Liter SportMaster and TorqueMaster lower units, providing a reliable solution when servicing the gearcase on high-output Mercury outboards. This seal kit replaces Mercury OEM part number 816575A6 and is engineered to restore proper sealing and water protection inside the gearcase.
These lower units are commonly found on Mercury Racing and high-performance fishing outboards, where maintaining gearcase integrity is essential to protecting expensive internal components.
Designed for Mercury 3.0L and 3.2L High-Performance Outboards
This gearcase seal kit fits many Mercury 3.0-liter and 3.2-liter outboards, including popular high-performance models such as the Mercury 300X, 250 XS, and 300XS.
These engines are widely used in bass boat tournaments, offshore performance boats, and high-speed recreational applications, and many of them utilize SportMaster or TorqueMaster gearcases to handle the power and speed these engines produce.
The kit is compatible with engines using Optimax DFI (Direct Fuel Injection), EFI, and XS performance platforms, where maintaining a sealed and properly lubricated gearcase is critical for long-term reliability.
Why Gearcase Seal Maintenance Matters
The gearcase on a high-performance outboard operates in a harsh environment where water pressure, heat, and rotational loads constantly challenge the seals protecting the internal gears and bearings.
Over time, seals around the driveshaft, propshaft, and shift shaft can wear or become damaged, allowing water to enter the gear oil. Even a small amount of water intrusion can lead to bearing corrosion, gear wear, and eventual gearcase failure.
Replacing worn seals during routine maintenance or during a gearcase rebuild helps prevent these issues and keeps the SportMaster or TorqueMaster lower unit operating at peak performance.
Built for High-Speed Mercury Gearcases
SportMaster and TorqueMaster gearcases are designed specifically for high-speed outboard applications, often used on boats capable of exceeding 70–100+ mph. These gearcases are engineered to handle heavy loads and surface-piercing propeller operation.
Because of these demands, using a quality seal kit that matches the original Mercury specifications is critical when servicing the gearcase.
The Buckshot Racing #77 3.0 Liter Gearcase Seal Kit, replacing Mercury part 816575 A6 provides the sealing components needed to restore proper protection and maintain gearcase reliability.
Compatible Mercury Outboard Models
This gearcase seal kit is commonly used on Mercury Racing and Mercury Marine outboards that utilize SportMaster and TorqueMaster lower units. (Mercury 300X, Mercury 250 XS, Mercury 300XS, Mercury Optimax DFI, Mercury 3.2 Stroker Liter XS)
Keep Your SportMaster or TorqueMaster Running Strong
For owners running Mercury Racing 300X, 250XS, and 300XS outboards, regular gearcase maintenance is one of the most important steps in protecting your investment. Replacing worn seals before they fail helps prevent water intrusion, protects gears and bearings, and ensures the lower unit continues to perform under demanding conditions.
The Buckshot Racing #77 Gearcase Seal Kit, replacing Mercury OEM part number 816575A 6 provides a complete and dependable solution when servicing SportMaster and TorqueMaster gearcases used on Mercury’s most powerful performance outboards.
Contact Mike at 714-697-1716 or mike@buckshotracing77.com for technical support.