O.S. Engine OS44601000 O.S. ENGINES CRANKCASE FSa-56 replacement crankcase  [OS44601000]

Crankcase for FSa-56 engines

This crankcase is the replacement housing offered under the O.S. ENGINES FSa-56 designation for RC-scale glow engines. It serves as the main structural shell that locates the crankshaft, supports bearing seats and provides mounting points used during engine rebuilds and routine maintenance.

Compatibility is centered on the FSa-56 engine family; confirm fit against your engine casting and mounting pattern before installation. The part is intended for scale model engine work only and is not for full-size machinery.

Installation notes: remove the old case carefully, keep internal components (crankpin, bearings, seals) clean and indexed, and transfer bearings or seals per manufacturer practice. Do not force components; check bearing seating, sealing surfaces and alignment visually before final assembly. Use the engine maker's fastener torque recommendations where available.

Tuning and service role: the crankcase positions the rotary assembly and affects crankshaft alignment and bearing preload, so a correctly fitted case supports consistent engine timing and efficient operation during tuning, run-in and repairs. Inspect mating faces for burrs and verify clearances when replacing related parts.

Use this crankcase when restoring or servicing an FSa-56 RC glow engine, and verify all bearings and seals during reassembly to maintain reliable operation.