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352066 – Continental Motors OEM General Gasket
Now Superseded by Part Number: 649984
Available now on the Airparts.aero Marketplace.
The 352066 is a precision-engineered sealing component manufactured by Continental Aerospace Technologies (formerly Teledyne Continental Motors). This "General Gasket" is a high-utilization part found across a wide range of Continental's 470, 520, and 550 series horizontally opposed engines. It is primarily used at mechanical interfaces requiring a leak-proof seal against pressurized engine oil or crankcase vapors, such as accessory drive pads, oil filter adapters, or cooling system flanges.
Continental has officially superseded the 352066 with Part Number 649984. This transition reflects advancements in gasket material science. While the legacy part was often a traditional fiber or cork-composite material, the new 649984 features a modernized, high-performance synthetic composition designed to provide superior resistance to "compression set" and chemical degradation from modern ashless dispersant (AD) oils and fuel additives.
Key Features
Advanced Synthetic Material: The 649984 update offers improved thermal stability, maintaining a tight seal even during the extreme heat cycles of a high-performance piston engine.
Controlled Swell Characteristics: Engineered to expand slightly upon contact with engine oil, ensuring a "living seal" that accommodates minute surface imperfections on the mating engine castings.
Tear and Shear Resistance: Unlike older fiber gaskets that could become brittle over time, the 649984 is reinforced to resist tearing during installation and the mechanical "shifting" caused by engine vibration.
Non-Stick Surface Coating: Often features a specialized surface treatment to prevent "vulcanizing" to the engine case, allowing for easier removal during the next overhaul or inspection without damaging the aluminum mating surfaces.
OEM Precision: Manufactured to the exact dimensional tolerances required by the Continental Type Certificate (TC), ensuring perfect alignment with oil galleries and bolt patterns.
Technical Specifications
Original Part Number: 352066
New Part Number: 649984
Manufacturer: Continental Aerospace Technologies (OEM)
Component Type: Flat Sealing Gasket (General Purpose)
Material: Modernized Nitrile/Fiber Composite (649984 spec)
Fluid Compatibility: Aerospace Engine Oils (Mineral and AD), Avgas (100LL)
Certification: FAA-PMA / OEM Original Equipment
Engine Compatibility
Continental O-470 Series: (Including J, K, L, M, R, and S models)
Continental IO-470 Series: (Including C, D, E, F, G, H, J, K, L, M, N, P, R, S, U, and V models)
Continental IO-520 Series: (Widely used across all variants)
Continental IO-550 Series: (The standard for high-performance Beechcraft, Cessna, and Cirrus aircraft)
Continental TSIO-520/550: (Turbocharged variants requiring high-temperature sealing integrity)
Note: Always consult the Continental Motors Illustrated Parts Catalog (IPC) for your specific engine serial number to confirm the correct application for this general-purpose gasket.
Applications
Accessory Drive Pads: Sealing the interface for magnetos, fuel pumps, or alternators.
Oil Filter Adapters: Ensuring a leak-free connection between the filter housing and the engine block.
Tachometer Drive Covers: Sealing unused or active mechanical drive ports on the accessory case.
Why Upgrade to 649984?
In a horizontally opposed engine, even a small "weep" can lead to significant oil loss over a long cross-country flight and can coat the exhaust system, creating a fire hazard. The 649984 (superseding 352066) is designed to solve common "cold-leak" issues. The improved material density of the 649984 resists wicking, a phenomenon where oil travels through the fibers of the gasket itself. By utilizing the latest OEM revision, owners and mechanics ensure that the engine remains "dry" and that the internal oil pressure is maintained at the critical accessory drive interfaces.
Maintenance & Installation Addendum
Proper installation is critical to prevent gasket extrusion or failure.
Tech Tip: Ensure both mating surfaces are clean and "bright" using a plastic scraper—never use a metal blade or wire wheel on aluminum engine cases, as this can create a permanent leak path.
Installation Note: While some mechanics use supplemental sealants (like Gasket Sealant No. 2 or TiteSeal), the 649984 is designed to be installed dry or with a light film of engine oil unless the Continental Overhaul Manual (OHM) specifically directs otherwise for that specific drive pad. Always follow the specified torque sequence for the accessory bolts to ensure even compression.
Note: The 649984 is a flight-critical sealing component. During every pre-flight and 50-hour inspection, check the accessory case for signs of oil dampness. Installation must be performed by a certified A&P mechanic in accordance with Continental Motors Service Bulletin M-0.
