Service Instruction No. 1204 D

Exhaust Flange Gaskets

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Supersedes Service Instruction No. 1065A and No. 1204C

August 26, 2010


All Lycoming Engines using either V-Shaped Spiral Wound or Beaded Exhaust Flange Gaskets.


At overhaul or whenever exhaust flange gaskets are replaced.

Exhaust flange gaskets made of V-shaped, spiral-wound layers of stainless steel and either a non-asbestos filler or flexible graphite are available for all Lycoming engines using the two or three hole gasket design. See Figure 1. This gasket is resilient and automatically adjusts for mechanical compression, internal pressure variations, and temperature changes.

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