GT22 / FS70U Crankshaft Ball Bearing OS44731000 for Nitro Engines by O.S. Engine  [OS44731000]

Specified Ball Bearing for GT22 and FS70U Crankshafts

The O.S. Engine part OS44731000 is an RC-scale crankshaft ball bearing replacement meant for the FS70U and GT22 engine model references included in the product name. Its primary role is to maintain correct crankshaft end play and ensure free rotation within nitro model engines.

Use this bearing when the factory unit shows signs of wear such as rough running or excessive end float. Before pressing in a new bearing, check the bearing journal and seating bore for corrosion or nicks, clean mating faces, and determine whether you require a tight press or a careful slip fit. This overview purposefully does not give full disassembly instructions but emphasises inspection and fitment concerns.

Installed correctly, the crankshaft ball bearing helps deliver smoother idle characteristics and reliable high-rpm performance by minimizing unwanted shaft movement and friction. Select proper lubrication and follow recommended service intervals from your engine documentation.