Lycoming Air Throttle Housing Gasket | O-540 IO-540 TIO-540 IO-720
Lycoming Air Throttle Housing Gasket | O-540 IO-540 TIO-540 IO-720
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The Lycoming Air Throttle Housing Gasket provides the critical seal between the throttle/air housing and its mating surface on applicable Lycoming engines. Designed for use during throttle body, induction system, or air housing installation and service, this gasket helps prevent unwanted air leaks and maintain a properly sealed induction system.
A good replacement item for routine maintenance, engine rebuilds, induction system repairs, and airboat engine projects using compatible Lycoming O-540, IO-540, TIO-540, and IO-720 engines.
Product Features
- Replacement air throttle housing gasket
- Seals the throttle/air housing mating surface
- Helps prevent induction air leaks
- Recommended when removing or reinstalling the throttle housing
- Suitable for engine repairs, rebuilds, and induction-system maintenance
- Broad compatibility with Lycoming 540-series engines
- Excellent replacement component for applicable Lycoming-powered airboats
- Quantity: 1 gasket
Engine Fitment
| Engine | Compatible Configurations |
|---|---|
| IO-540 | A1A5, B1A5, B1B5, B1C5, C1B5, C1C5, C2C, C4B5, C4B5D, C4C5, C4D5, C4D5D, D4A5, D4B5, D4C5, E1A5, E1B5, E1C5, G1A5, G1B5, G1C5, G1D5, G1E5, G1F5, J4A5, K1A5, K1A5D, K1B5, K1B5D, K1C5, K1D5, K1E5, K1E5D, K1F5, K1F5D, K1G5, K1G5D, K1H5, K1J5, K1J5D, K1K5, K2A5, L1A5, L1A5D, L1B5D, L1C5, M1A5, M1A5D, M1B5D, M1C5, M2A5D, N1A5, P1A5, R1A5, S1A5, T4A5D, T4B5, T4B5D, T4C5D, U1A5D, U1B5D, V4A5, V4A5D, W1A5, W1A5D, W3A5D, AA1A5, AA1B5, AB1A5, AC1A5, AE1A5, AF1A5, AG1A5 |
| IO-720 | A1A, A1B, A1BD, B1A, B1B, B1BD, C1B, C1BD, D1B, D1BD, D1C, D1CD |
| O-540 | A1A, A1A5, A1B5, A1C5, A1D, A1D5, A2B, A3D5, A4A5, A4B5, A4C5, A4D5, A4E5, B1A5, B1B5, B1D5, B2A5, B2B5, B2C5, B4A5, B4B5, D1A5, E4A5, E4B5, E4C5, F1A5, F1B5, G1A5, G2A5, H1A5, H1A5D, H1B5D, H2A5, H2A5D, H2B5D, J1A5D, J1B5D, J1C5D, J1D5D, J2A5D, J2B5D, J2C5D, J2D5D, J3A5, J3A5D, J3C5D, L3C5D |
| TIO-540 | A1A, A1B, A1C, A2A, A2B, A2C, C1A, E1A, F2BD, G1A, H1A, J2B, J2BD, K1AD, N2BD, R2AD, S1AD, T2AD, U2A, V2AD, W2A, AA1AD, AB1AD, AB1BD, AE2A, AF1A, AF1B, AG1A, AH1A, AJ1A, AK1A |
Common Airboat Applications
This gasket covers many of the Lycoming 540-series engines commonly adapted for airboat use, including numerous:
O-540 • IO-540 • TIO-540
Keeping the throttle housing properly sealed is important because an induction leak can allow unmetered air into the engine, potentially affecting mixture, idle quality, and overall engine performance.
Installation Recommendation
Whenever the air throttle housing is removed, inspect the mating surfaces for old gasket material, damage, or irregularities. Installing a new gasket rather than reusing a compressed or damaged gasket helps provide a reliable seal during reassembly.
Fitment Note: Lycoming engines can have different induction and throttle configurations even within the same engine family. Always verify the complete engine model and suffix, existing throttle housing configuration, and applicable part number before ordering.
