O.S. Engine OS29703200 GT55 Piston Replacement for RC Glow Engines  [OS29703200]

O.S. ENGINES PISTON GT55
Price:
AUD$52.11
Brand:
O.S. Engine
Model:
OS29703200
GTIN:
4531028145757
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GT55 piston: rebuild and fit notes

The O.S. Engine GT55 piston is an RC-scale engine part intended for compatible O.S. Engine glow units. This note emphasises installation, fit, and durability considerations rather than giving an exhaustive parts compatibility list.

Functionally, the piston controls compression and chamber sealing; fitting a new GT55 piston is a central task in an engine overhaul. Before assembly, check the piston skirt and crown for marks, thoroughly clean surfaces, and confirm the cylinder walls and bearings are in sound condition.

Installation guidance: the piston should enter the bore with correct clearance and without binding. Many technicians perform light honing and a staged break-in to promote ring seating and reduce initial wear. Use the correct lubricants and follow the engine maker’s run-in procedure to protect the new components.

Tuning effects: piston wear can change compression and combustion consistency, altering idle quality, midrange throttle response, and peak output. Replacing a degraded piston often recovers lost compression and helps stabilise tuning across different operating conditions.

Specifications

  • Item: Piston GT55
  • Material: Not specified by manufacturer
  • Model Number: OS29703200
  • Compatibility: Compatible with O.S. Engine RC glow engines, confirm exact fitment with your engine model

Fit this piston only after confirming compatibility with your engine, and follow accepted rebuild and break-in procedures to ensure dependable service life.

Can I reuse the old piston rings with a new piston?

Ring reuse is not recommended unless they are within spec and undamaged; replacing rings with the piston provides the best chance of restoring compression and avoiding leaks.

Is honing the cylinder necessary before fitting a new GT55 piston?

Light honing is often performed to remove glazing and help rings seat, but do so carefully to maintain correct bore dimensions and surface finish.

What signs indicate improper piston fit?

Excessive side play, tight spots during assembly, abnormal engine noise, or rapid loss of compression are indicators the piston or bore may not fit correctly.

Are special torque settings required when reassembling?

Follow the engine manufacturer’s recommended torque values where provided; if not available, use cautious, even tightening to avoid distorting components during assembly.

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