Crankcase Housing for 61SX Engines OS27901000 Compatible with 61SX-H, 61SX-HG, 61SX-HGL by O.S. Engine  [OS27901000]

61SX series crankcase housing details

This component is an aftermarket replacement housing intended for use with O.S. Engine 61SX-H, 61SX-HG and 61SX-HGL glow engines. It locates the crankshaft and oil seals and is supplied to restore correct mechanical alignment and combustion chamber sealing where the original housing is compromised.

Fitment is usually part of a complete engine strip-down and rebuild; inspect bearing bores, gasket faces and mating faces thoroughly. The unit is delivered as a single housing to replace a damaged crankcase and should be trial-fitted to confirm crankshaft axial clearance and proper seal compression before final assembly.

For service and tuning, the crankcase's role is structural and sealing-related; it will not alter ignition timing but ensures internal components run true, which supports repeatable carburation and ignition stability in glow engines used on RC models.

Use this crankcase when the original housing is worn or damaged, or during a full rebuild to recover correct internal alignment and sealing of the engine assembly.