Sierra 18-8386 Lower Unit Seal Kit

The Sierra 18-8386 Lower Unit Seal Kit is a complete gearcase seal kit designed for Suzuki V6 outboard lower units. This kit includes the seals required to service the gearcase and maintain proper sealing to protect internal components.

Fitment Overview

This seal kit replaces Suzuki OEM part numbers 25700-98J00 and 25700-98J01. These OEM numbers are used across Suzuki V6 gearcase assemblies found on DF200 through DF300 outboards.

OEM diagram lookup confirms this kit is used across multiple horsepower ranges and model variants that share the same gearcase design.

Compatibility

These engines share a common V6 gearcase platform where this seal kit is used.

Example Model Applications

• Suzuki DF200 V6 outboards
• Suzuki DF225 V6 outboards
• Suzuki DF250, DF250S, and DF250SS models
• Suzuki DF300 V6 outboards

These are common applications. Always verify using your OEM part number or gearcase diagram.

Fits These Serial Ranges

This seal kit is used across multiple Suzuki V6 engine generations and does not follow a single serial-number break.

Important: Confirm compatibility by matching your existing seal kit to 25700-98J01 or 25700-98J00.

Looking for this same seal kit in other brands?
View GLM Gearcase Seal Kit 8386E

Part Numbers and Cross References

What This Part Is Used For

This kit is used to service the lower unit (gearcase), replacing critical seals that prevent water intrusion and maintain proper lubrication of internal gears.

• Seals prop shaft, drive shaft, and shift shaft areas
• Prevents water contamination in gear oil
• Maintains proper lubrication inside the gearcase
• Helps extend gearcase life

Failed seals can allow water into the gearcase, leading to premature wear or gear failure.

System Function and Connections

• System Type: Lower unit / gearcase
• Component Type: Seal kit
• Location: Gearcase (lower unit)

FAQ

What engines does this seal kit fit?
It fits Suzuki DF200, DF225, DF250, and DF300 V6 outboards using this gearcase design.

What does this kit replace?
It replaces Suzuki part numbers 25700-98J00 and 25700-98J01.

Does this fit all DF250 models?
It fits DF250 models that use this specific gearcase. Always confirm using your OEM diagram.

When should I replace lower unit seals?
During gearcase service or if water contamination is found in the gear oil.

Searchable Part Numbers

18-8386, 25700-98J01, 25700-98J00, Suzuki DF200 seal kit, DF250 lower unit seals, DF300 gearcase seal kit