Sierra Lower Unit Seal Kit (47-2598)

The Sierra 47-2598 Lower Unit Seal Kit is a complete replacement seal kit for marine lower units. Engineered to Sierra’s marine-grade standards, this kit provides all the seals needed to restore a leak-free lower unit during service or rebuild protecting your gear oil and keeping water out of the gearcase.

Key Features

• Complete lower unit seal kit includes all seals required for a full lower unit reseal
• Built to Sierra’s marine-grade specifications for durability in saltwater and freshwater environments
• Designed for proper fitment and reliable sealing under operating pressure
• SKU: 47-2598

Best Use Case

Use this kit any time you’re servicing or rebuilding a lower unit particularly when changing gear oil and finding water contamination, or when replacing prop shaft seals due to wear or damage. Replacing all seals as a set during any lower unit disassembly is best practice and prevents repeat labour costs from a missed seal.

Parts Desk Insights

Fitment for this kit varies by engine make, model, and year always confirm compatibility against the Sierra application guide before ordering. If you’re working on a MerCruiser sterndrive, also consider the Sierra 47-2652 MerCruiser Lower Unit Seal Kit. For upper unit or transom sealing, see the Sierra 47-2586 Upper Unit Seal Kit, Sierra 47-27721 Transom Seal Kit, Sierra 47-8205 Transom Seal Kit, or Sierra 82061 Transom Seal Kit.