O.S. Engine OS49460400 Valve Spring Retainer GF40 engine accessory  [OS49460400]

Valve spring retainer for GF40

This O.S. Engine OS49460400 valve spring retainer is an RC-scale replacement part intended for GF40 glow/nitro engines, serving the valve train by holding valve springs in place during assembly, inspection and tuning. Its role is purely mechanical inside the engine head assembly, helping maintain consistent spring seating which can affect valve timing stability under load.

Installation is straightforward for those familiar with glow engine head work: remove the cylinder head and valve assembly as required, position the retainer on the valve stem and reassemble components in the correct sequence, checking that springs and keepers seat cleanly. Use established engine reassembly practices and verify clearances before running the engine.

In tuning and maintenance workflows the retainer is a small but important item, particularly when changing spring rates or performing frequent head work; inspect retainers and springs for wear or deformation after heavy use and replace if any movement or damage is found to avoid valve train inconsistency.