SIERRA 18-2614 Lower Unit Gearcase Seal Kit

Compatible Engines

The SIERRA 18-2614 lower unit gearcase seal kit is a critical component for maintaining the integrity and reliability of your boat's propulsion system. This high-quality replacement is specifically designed for MERCRUISER MC-I engines manufactured between 1967 and 1982. Given the nature of aging power units, compatibility must always be verified carefully. Do not rely solely on the engine's production year, as modifications may have occurred. The most reliable way to confirm fitment is by comparing catalog number 18-2614 with the original equipment (OE) number found in your owner's manual. If you have any doubts about fitting this part to your specific model, contact our customer support – we are happy to help you select the correct part so you can safely hit the water.

Installation and Maintenance

Replacing seals in the lower unit is a task that requires precision and patience. Before starting work, ensure you have the appropriate tools and fresh sealant grease. Thoroughly clean the mating surfaces of any old material residue and corrosion so the new SIERRA seal sits perfectly flat. Never reuse old seals – their elasticity has been lost, which risks oil and water leaks into the gearcase interior. During installation, ensure screws are tightened evenly to avoid distorting the seal. Regular replacement of this kit prevents water from entering the propulsion unit, which is the primary cause of gear corrosion. Investing in an original SIERRA kit guarantees the long lifespan of your engine.

• Full compatibility with MERCRUISER MC-I engines (1967-1982).
• High-quality materials ensuring long-lasting sealing.
• Original catalog number 18-2614 for easy verification.
• Cost savings compared to original engine manufacturer parts.