O.S. Engine OS23411000 Crankcase 37SZ-H replacement crankcase  [OS23411000]

Crankcase for 37SZ-H engines

This crankcase is an RC-scale replacement part sold under O.S. Engine as OS23411000 and identified for use with the 37SZ-H engine family. It serves as the central engine housing, providing the mechanical envelope for the crankshaft and related internals in model engine assemblies.

Use this part when the original crankcase is worn, damaged, or when rebuilding an engine during scheduled maintenance. The item is intended for hobby-grade model engines only and is not for real vehicle use.

Installation notes: inspect mating surfaces and bearings when replacing the crankcase, verify alignment of the crankshaft and connecting rod, and follow the engine manufacturer’s service procedures for torque values and gasket selection. If bearings or seals are reused, confirm they meet serviceability standards before reassembly.

As a direct-service crankcase option, this part supports routine engine overhauls and tuning work on compatible 37SZ-H model engines; carry out checks on bearings and clearances during replacement to preserve running reliability.