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Printed from https://aircraftdirectives.com/engines/lycoming-o540-b4b5/breakdown · AircraftDirectives restates official FAA and manufacturer records; the official sources named on this sheet control. Not an airworthiness determination.

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Lycoming

O-540-B4B5

Six opposed air-cooled cylinders with upper shroud tubes, sump induction, a carburetor and fitted PA-28-235-type exhaust.

Rendered exterior of the Lycoming O-540-B4B5 engine

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Model accuracy & scope

Reviewed exterior models with fitted geometry. Installed part numbers and component-level manual matching remain unverified unless explicitly identified.

  • Reviewed first exterior; dimensions, routes and materials include fitted approximations. Not exact installed OEM geometry.
  • Parts groups are a browsing aid, not an OEM exploded assembly or an installed parts catalogue.
  • Internal mechanisms, functional flow and maintenance fit are not established.
  • Standard-flange family sources do not establish every B4B5 serial configuration.
  • Rear wire spacing, flange boundaries and fitted exhaust remain refinement work.

Use the applicable manufacturer manual and parts catalogue for maintenance and exact installation details.

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Manufacturer references

These references inform the model as a whole. A component is linked to a specific page or figure only when that match has been verified.

  1. Lycoming O-540 / IO-540 Operator Manual 60297-10

    Document host: www.lycoming.com

    Edition recorded in the original source packet; typical configurations

    Reference pages: 1-1, 1-2, 2-1, 2-6, 7-4

    O-540 architecture, numbering and illustrated appearance; no serial-specific installation claim.

  2. Lycoming O-540-B/E/G Parts Catalog PC-115-2

    Document host: www.lycoming.com

    Historical standard-cylinder-flange catalogue

    Reference pages: Figs 16, 18, 22, 29

    Qualified family component roles; exact flange/accessory effectivity unresolved.