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

Replacement crankshaft ball bearing for RC nitro engines

This O.S. Engine crankshaft ball bearing is an RC-scale replacement matched to the engine codes listed in the title. It supports the crankshaft assemblies in 32HS-HX, 46HS, 6H and 7H engines and helps reduce rotating friction to maintain consistent idle and throttle response.

When you overhaul a nitro engine, replace worn crankshaft bearings with the correct specification to preserve balance and clearances. Fit the bearing using a press or suitable socket that bears on the outer race so internal components are not damaged. Check that the crankshaft turns freely and that endplay is within acceptable limits before completing the rebuild.

Inspection advice: watch for rough running, pitting or discoloration after extended use, remove contaminants from the crankcase before fitting a new unit, and prefer light oiling after break-in rather than heavy grease which can trap debris. A quality bearing aids steady RPM and more predictable needle adjustments.