VALVE INSURANCE 28-822651 PAF15-07040007

Function and technical context

The valve lock is a structural component of the distribution system in internal combustion engines that acts as a retaining and stabilizing element for the intake and exhaust valves. This part prevents unwanted axial displacement during engine operation, ensuring that each valve remains in its correct position within the valve guide and maintains precise contact with its seat. Its correct operation is essential to preserve the tightness of the combustion chambers, ensure optimal compression of the thermodynamic cycle and maintain exact synchronization of the camshaft with the crankshaft, which has a direct impact on engine efficiency, power developed and fuel consumption.

When to replace this part?

Although valve locks have a long service life, they can suffer progressive wear due to continuous vibration, material fatigue inherent to the operating cycle, or corrosion in salt water environments. Periodic inspection during each seasonal maintenance is recommended, especially in engines with many accumulated operating hours or in boats that remain anchored in salt water for long periods. Replacing the valve lock preventatively during major overhauls prevents unexpected failures and costly repairs in adverse navigation conditions, improving the operational reliability of the distribution system.

Compatible Mercury Mariner Engines

Equivalent manufacturer part numbers