Upgrade Valve Spring Retainer for GF40 - OS49460400 by O.S. Engine  [OS49460400]

Retainer Function and Fit

The O.S. Engine OS49460400 valve spring retainer is an RC replacement part for GF40 glow/nitro engines that secures the valve springs during assembly and inspection. Serving a mechanical role within the head, it helps ensure correct spring seating which supports dependable valve behaviour under load.

Installation is intended for those familiar with glow engine head procedures: remove the cylinder head and valve components as required, locate the retainer on the valve stem and reassemble in sequence while confirming springs and keepers seat properly. Use established reassembly checks and verify valve clearances prior to running the engine.

When tuning or maintaining the engine the retainer is a small yet important item; especially when swapping spring rates or doing frequent head work, routinely inspect for wear, deformation or looseness and replace if any defect is found to avoid valve train issues.