YAMAHA SCREW 90109-08022 REC90109-08022

Function and technical context

This fixing screw is part of the structural and assembly components of Yamaha engines, being responsible for ensuring the correct fastening of critical elements of the engine block, cylinder head or auxiliary systems. Its function is to maintain the union between components under pressure and constant vibration, preventing loosening and loss of alignment that could compromise the integrity of the engine. When such a bolt wears, corrodes or loosens, vibrations can be transmitted uncontrollably through the engine block, causing progressive damage to adjacent gaskets, seals and connections.

When to replace this part?

Engine bolts should be inspected at every seasonal inspection, especially on boats subjected to heavy use or saltwater navigation, where corrosion accelerates deterioration. If you detect looseness in the cylinder head, coolant or oil leaks around fastening areas, or if you see visible corrosion on the bolt during maintenance, it is time to replace it. Preventatively changing engine bolts before they fail prevents emergency repairs at sea and prolongs the life of adjacent components that depend on proper fastening.

Equivalent manufacturer part numbers