O.S. Engine OS28157000 Crankcase Cover for GT15HZ Engines  [OS28157000]

Service cover for GT15HZ crankcase

This cover plate is produced to fit O.S. Engine GT15HZ units as a direct spare for the crankcase area, intended only for use with radio-controlled model engines. It restores the closure section of the crankcase with accurate alignment for the GT15HZ series.

The cover's function is practical and maintenance-focused: it holds the crankcase sealed, supports internal bearing and seal retention, and ensures straightforward reassembly following service. Clean mating surfaces and position any gasket or sealing compound correctly to preserve chamber integrity.

Installation advice: either remove the engine from the model or clamp it securely in a bench mount, use the appropriate hex driver for the fasteners, and tighten bolts progressively in a star pattern to prevent distortion. Confirm dowel pins and locating features fully engage so the cover seats correctly.

Maintenance and tuning note: this item is relevant during teardown, bearing change-out, or crankshaft inspection; replacing a damaged cover can eliminate small leaks and help maintain consistent compression that influences idle and throttle response on glow-type engines.