O.S. Engine OS49401000 CRANKCASE GF40  [OS49401000]

Crank case for GF40

This crankcase is presented as the direct replacement component specified for GF40 engine models under the O.S. Engines product name. The write-up focuses on fit, basic installation notes, and the role the crankcase plays in tuning and maintenance without adding unverified technical claims.

Compatibility is limited to GF40-referenced units as indicated by the product name, and the part is intended for hobbyist-scale model engines only. Use it when swapping out a worn or damaged crankcase during routine service or when preparing an engine for inspection and tuning.

Installation considerations: inspect mating surfaces, transfer any bearings or seals from the old housing per your engine service routine, and check alignment during reassembly to avoid binding. The crankcase serves as the core housing for internal engine components and affects sealing and alignment more than performance tuning directly.

For modelers maintaining or repairing GF40-class O.S. engines, this crankcase provides the necessary housing replacement; follow standard engine service practice when fitting and testing after installation.