Upper Engine Gasket Set SIERRA 118-1274

Compatible Engines

The SIERRA 118-1274 upper engine gasket set is a critical component ensuring the seal and reliable operation of your propulsion unit. This product is dedicated to boat and outboard engines, including MERCRUISER models such as 153/2.5L (years 1965-88), 181/3.0L (1973-84), and 181/3.0L HO (1990-98). Due to the variety of engine configurations across different production years, compatibility must always be verified by the manufacturer's catalog number 118-1274 or the original OE number. If you have any doubts about fitting this part to a specific model, we strongly recommend contacting our store support, who will help select the correct component.

Installation and Operation

Gasket replacement is a task requiring precision. Before disassembly, ensure the engine is cool and the cooling system is drained. Use only recommended SIERRA gaskets to ensure the durability of connections. During installation, keep surfaces clean, and when tightening screws, use the torque specified by the engine manufacturer. Regular gasket replacement prevents oil and water leaks, extending the life of the unit.

• High-quality construction – gaskets resistant to high temperatures and engine oils.
• Original SIERRA number 118-1274 – guarantee of exact fit to specifications.
• Complete set – contains all necessary elements for the upper engine rebuild.
• Corrosion protection – materials ensuring long-term sealing in harsh conditions.