MerCruiser Bravo One Sterndrive 300 Hour Maintenance Kit

Mercury MerCruiser Bravo One Sterndrive 300 Hour Maintenance Kit

The Mercury Marine part number 8M0147074 is a genuine OEM 300-hour maintenance kit engineered specifically for MerCruiser Bravo One sterndrives built from 1988 through 2016 (serial number 2A514802 and below). It consolidates all of the critical service components needed for scheduled sterndrive maintenance into one convenient package, helping owners keep their Bravo One drives performing reliably across both freshwater and saltwater environments.

Each kit contains precisely specified OEM components, meaning tolerances, materials, and fitment align exactly with what the Bravo One drive was designed around. This eliminates guesswork during installation and reduces the risk of leaks, premature wear, or component incompatibility that can result from aftermarket alternatives. For most boaters experienced with sterndrive service, installation is clean and predictable thanks to the precise OEM fit.

Key Features

• Complete 300-hour maintenance kit for MerCruiser Bravo One sterndrives (1988–2016), serial number 2A514802 and below
• Includes sterndrive install gasket kit, aluminum anode kit, gearcase drain seals, transom repair kit, shift cable kit, and gearcase fill and drain screws
• Genuine Mercury Precision OEM components built for long-term marine durability
• Corrosion-resistant aluminum anodes provide essential cathodic protection in both freshwater and saltwater
• Gaskets, seals, and hardware engineered for a tight, precise fit
• Convenient all-in-one package for scheduled sterndrive service intervals
• Note: Mercury 4-Stroke Marine Engine Oil and Mercury Premium Gear Lube 858058K01 are sold separately

Fresh gaskets restore sealing integrity throughout the sterndrive system while new gearcase drain seals prevent fluid loss. The included shift cable kit can improve gear engagement feel at the helm, reducing hesitation when transitioning between forward and reverse. Aluminum anodes deliver lasting corrosion protection, particularly important for vessels operating in brackish or saltwater conditions. After completing service with this kit, many boaters report quieter operation, steadier thrust, and more predictable handling across mid-range and top-end speeds.

This kit is commonly used on performance boats, cruisers, offshore fishing vessels, wake boats, and sport models powered by MerCruiser Bravo One sterndrives. It is the correct 300-hour service kit for any Bravo One drive within the 1988–2016 production range.