SCREW 97080-06045 REC97095-06045

Function and technical context

This bolt plays a critical fastening role in the cylinder head and cylinder head assembly of Yamaha and Mercury marine engines. It is part of the structural system that guarantees the tightness of the combustion chamber and the correct alignment of internal engine components. Poor tightening or a worn screw can compromise the integrity of the seal, allowing water to enter or combustion gases to escape, which would cause overheating, loss of compression and progressive deterioration of the engine.

When to replace this part?

After disassembling the cylinder head for any maintenance or repair intervention, it is mandatory to replace these screws with new ones, since they lose their sealing capacity after the first tightening and do not guarantee the necessary pressure in subsequent reuses. Symptoms of failure include coolant leaks at the head gaskets, loss of compression detected in pressure tests, or unexplained engine overheating in the cooling system. Performing this replacement preventively during seasonal inspections avoids costly cylinder head repairs in the middle of sailing.

Equivalent manufacturer part numbers