Upper Gearcase Seal SIERRA 118-2990

Compatible Engines

The SIERRA 118-2990 upper gearcase seal is a critical component ensuring the integrity of your propulsion system. Due to the absence of a specific model list in the source data, compatibility must be verified using catalog number 118-2990 or the original OE (OEM) number. If you have any doubts, we recommend contacting our support team to confirm the fit for your outboard motor.

Installation and Maintenance

Replacing this seal is a preventive measure that protects against water intrusion into the gearcase. Regular replacement prevents costly bearing and gear failures. Before installation, ensure the mounting surface is clean and free of scratches. We recommend using appropriate assembly lubricant to avoid damaging the seal during pressing.

• Original SIERRA quality – guarantees durability and resistance to marine conditions.
• Perfect fit – precise dimensions ensuring 100% sealing.
• Gearcase protection – effectively blocks water and contaminants.
• Easy installation – standard size facilitating replacement in service conditions.