70SZ-H Replacement Cylinder Sleeve OS27003100 for Nitro Engines by O.S. Engine  [OS27003100]

Replacement sleeve compatible with 70SZ-H engines

This cylinder liner is supplied as a replacement part for O.S. Engine 70SZ-H nitro engines and serves as the internal bore surface for the piston. It is used when restoring cylinder integrity during engine servicing.

Provided as a direct replacement, the liner is intended to restore bore condition and correct running clearances without altering crankcase or piston geometry. Installation involves removing the head and piston, extracting the existing liner according to your service practice, checking sealing faces, then pressing or seating the new liner squarely to maintain concentricity. Observe the engine maker's torque and sealing instructions on reassembly.

As a standard service component, replacing a worn or damaged liner often recovers compression and stabilizes combustion, limiting the need for more extensive repairs. After fitting, check piston-to-wall clearance and carry out a careful run-in to confirm proper fit and compression.

This sleeve is aimed at model engine enthusiasts performing routine rebuilds on 70SZ-H nitro engines, providing a direct method to restore bore condition during service.