61SX Crankcase Replacement OS27901000 — for 61SX-H / 61SX-HG / 61SX-HGL by O.S. Engine  [OS27901000]

O.S. ENGINES CRANKCASE 61SX-H,-HG,-HGL
Price:
AUD$39.23
Brand:
O.S. Engine
Model:
OS27901000
Condition:
Brand New
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alt="O.S. ENGINES CRANKCASE 61SX-H,-HG,-HGL" title="O.S. ENGINES CRANKCASE 61SX-H,-HG,-HGL"

61SX crankcase overview and role

Designed as a direct replacement, this crankcase fits O.S. Engine 61SX-H, 61SX-HG and 61SX-HGL glow engines. It serves as the primary housing for the crankshaft and oil seals and is intended to restore correct mechanical location and combustion chamber sealing when the original housing is compromised.

Replacement is typically carried out during an engine overhaul; pay close attention to bearing seat condition, gasket faces and mating surfaces. Supplied as a single replacement housing, it should be test-fitted to confirm crankshaft endplay and appropriate seal compression before completing the rebuild.

While the crankcase does not change engine timing, its correct dimensions and sealing ensure the crankshaft and internals run true, which contributes to predictable carburation and ignition responses when tuning glow-powered RC engines.

Specifications

  • Item: Crankcase
  • Material: Not specified
  • Model Number: OS27901000
  • Compatibility: 61SX-H, 61SX-HG, 61SX-HGL

Install this crankcase during a full rebuild or when replacing a damaged housing to reestablish proper alignment and sealing throughout the engine assembly.

Will OS27901000 directly replace my worn crankcase?

If your engine is a 61SX-H, 61SX-HG or 61SX-HGL and the original housing matches these mounting points, OS27901000 is the intended replacement; always check fitment before final assembly.

Should I reuse existing bearings with this crankcase?

Reusing bearings is possible if they meet service limits, but for best results and longevity consider fitting new bearings and seals during the rebuild rather than relying on worn components.

Does the housing affect tuning consistency?

Yes — while it does not tune the engine, a true and sealed crankcase supports consistent internal geometry so tuning adjustments hold more reliably and performance is repeatable.

What are the critical checks after fitting?

After fitting, verify crankshaft endplay, ensure seals compress evenly, and confirm no binding or misalignment before running the engine at full power.

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