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Printed from https://aircraftdirectives.com/engines/lycoming-io720-a1b/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

IO-720-A1B

Eight opposed air-cooled cylinders with A1B front-inlet induction, fuel injection and paired rear magnetos.

Rendered exterior of the Lycoming IO-720-A1B 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.
  • Eight harness/support contacts and a small manifold-end fuel-hose fold remain real deferred defects.
  • Hollow drain collars receive capped tubes; internal oil drilling is absent.
  • Exhaust openings are blind recesses; regular wiring and casting finish remain simplified.

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 IO-720 Parts Catalog PC-119

    Document host: www.lycoming.com

    November 1977 cover; page-level revisions retained

    Reference pages: PDF 99–100, Fig 45, PDF 122, Fig 56

    A1A/A1B front-inlet configuration and fuel-line support roles. Rear-inlet family photo is not A1B-specific.

  2. Lycoming IO-720 Operator Manual 60297-19

    Document host: www.lycoming.com

    Fourth edition, October 2006

    Reference pages: PDF 66, Fig 7-3

    Front-inlet installation appearance; dimensions and installed accessory identity remain qualified.