O.S. Engine OS45060309 Valve Spring Seat for FS-26S, FS-40S and FS-48S  [OS45060309]

O.S. ENGINES VALVE SPRING SEAT FS-26S,40S,48S
Price:
CAD$5.19
Brand:
O.S. Engine
Model:
OS45060309
GTIN:
4531028120860
Condition:
Brand New
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Service part: valve spring seat for O.S. FS engines

This valve spring seat is an RC-scale replacement part intended for the O.S. Engine FS-26S, FS-40S and FS-48S engine family named in the model title. Its role is to provide a stable seating surface for valve springs during routine maintenance and tuning of nitro model engines, helping maintain consistent valve action under typical hobby use.

Fitting is straightforward for workshop-savvy hobbyists: remove the cylinder head, confirm valve spring orientation, then seat the new part with even, light pressure. Avoid sudden impacts and check the seating surface for flush contact before reassembling to help preserve repeatable valve timing during subsequent adjustments.

Treat this component as a model-engine part and use hobby-grade tools only; do not apply full-size automotive torque methods or heavy industrial presses that can deform small mating surfaces.

What is the correct installation sequence for this seat?

Start by removing the cylinder head, examine the valve spring and retainer orientation, then place the seat evenly on the valve guide. Use a small press or a soft mallet in short, controlled taps until the seat sits flush. Recheck alignment before final reassembly.

Which tools are best to avoid damage during seating?

Gentle tools give the best control: a small arbor press or a soft-faced mallet, plus a hex driver for head removal. Avoid heavy hammers or high-force presses that can mushroom the seat or distort the valve guide.

Is it safe to reuse the seat when swapping springs?

You can reuse the seat if inspection shows no dents, cracks, or uneven wear. Replace the seat if any deformation is found to ensure reliable seating and consistent valve action.

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