Replacement Crankcase for 61RX-H and HGL - O.S. Engine OS27921000  [OS27921000]

O.S. ENGINES CRANKCASE 61RX-H,HGL
Price:
£20.34
Brand:
O.S. Engine
Model:
OS27921000
Condition:
Brand New
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alt="O.S. ENGINES CRANKCASE 61RX-H,HGL" title="O.S. ENGINES CRANKCASE 61RX-H,HGL"
alt="O.S. ENGINES CRANKCASE 61RX-H,HGL" title="O.S. ENGINES CRANKCASE 61RX-H,HGL"

Crankcase fitment and purpose

The item is an RC crankcase listed under O.S. Engine OS27921000 and is specified for the 61RX-H and HGL engine identifiers shown in the product title. It is designed to locate the crankshaft and bearings, preserving the internal geometry required for correct engine operation.

Use is restricted to the model codes named in the title and to hobby nitro engine applications. Before fitting a new crankcase, remove old gasket material, clean the joint faces, inspect the bearing bores, and check seals to ensure proper sealing and alignment.

Proper seating of the crankcase supports reliable crankshaft runout and accurate bearing preload, factors that affect idle smoothness and peak delivery in nitro engines. Always verify fit with the engine’s crankpin and bearing dimensions during preassembly.

Specifications

  • Item: Crankcase
  • Material: Not specified
  • Model Number: OS27921000
  • Compatibility: 61RX-H,HGL

This crankcase is provided to replace the existing housing on 61RX-H and HGL engines, restoring correct crankshaft alignment and internal geometry for rebuilds and maintenance.

Is this crankcase compatible with both 61RX-H and HGL engines?

Yes. The product specification lists compatibility with the 61RX-H and HGL codes and it is intended as a replacement housing for those engine types.

Does the package include mounting hardware?

The listing refers only to the crankcase itself; mounting hardware, bearings and seals are not shown as included and should be acquired separately if required.

Any special preparation before fitting the new crankcase?

Prepare the mating surfaces by cleaning residual gasket or adhesive, inspect the bearing seating areas for wear, and perform a trial assembly to confirm correct crankshaft alignment before final tightening.

How important is crankcase accuracy for engine performance?

Crankcase accuracy is critical: it sets crankshaft runout and bearing preload, which in turn influence idle quality and power characteristics in nitro RC engines.

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