Precision Crankshaft Ball Bearing OS27381210 for 32HS-HX, 46HS, 6H, 7H by O.S. Engine  [OS27381210]

Precision ball bearing for nitro crankshafts

This O.S. Engine crankshaft ball bearing is manufactured as a replacement item for the engine codes stated in the model name. It is designed to support the crankshaft in 32HS-HX, 46HS, 6H and 7H engines and to reduce rotational drag for smoother throttle response.

When performing engine overhauls replace worn bearings with the correct type to preserve crankshaft alignment and dynamic balance. Use an arbor press or a suitable socket to press on the outer race only, preventing pressure on the internal balls or inner race. Confirm that the crank turns freely and check endplay before you finish reassembly.

Service advice: look for scoring, pitting or discoloration after hard use, clean the crankcase thoroughly before installation, and apply a thin oil after break-in rather than heavy grease to limit contamination. A smooth bearing contributes to steady RPM and cleaner tuning adjustments.