O.S. Engine OS49460400 GF40 Valve Retainer  [OS49460400]

Replacement Valve Retainer for GF40

The O.S. Engine OS49460400 valve spring retainer is an RC replacement designed specifically for GF40 glow/nitro engines, holding valve springs in place through assembly, inspection and adjustment. It performs a simple mechanical duty inside the head to keep spring seating consistent, which helps support predictable valve operation under load.

Installation is aimed at users comfortable with glow-engine head work: remove the head and valve gear as needed, position the retainer on the valve stem and reassemble in the correct sequence while checking that springs and keepers seat cleanly. Use proven engine reassembly steps and confirm valve clearances before starting the engine.

As part of tuning and routine maintenance the retainer plays a small but important role; whenever you change spring rates or carry out repeated head work inspect retainers and springs for wear or distortion and replace any components that show movement or damage to avoid erratic valve behaviour.