O.S. Engine OS45560310 Replacement Valve Spring Retainer for FS-120S  [OS45560310]

FS-series valve spring replacement retainer

This valve spring retainer is supplied as a direct replacement in O.S. Engine spare parts, referenced by model OS45560310 and the FS-120S designation. It is used to retain valve springs on FS-series glow engines and is suitable for engine servicing, repair, or scheduled rebuilds.

Its role is to maintain spring seating and alignment throughout engine running, so including this item in routine checks helps avoid valve timing faults. Before fitting, verify OS45560310 against your engine's service breakdown and inspect the surrounding valvetrain for signs of wear.

While the retainer will not alter valve timing, it ensures dependable spring retention when adjusting clearances or swapping springs during tuning. Handle small valvetrain parts carefully and adhere to recommended service intervals from the engine documentation.