05K21262 - Lycoming Cylinder Kit Piston Ring Assembly

05K21262 – Lycoming Cylinder Kit Piston Ring Assembly

Available now on the Airparts.aero Marketplace.

Overview

The Lycoming 05K21262 is a genuine Original Equipment Manufacturer (OEM) cylinder power assembly kit, providing a complete, factory-matched solution for replacing a cylinder on specific high-compression Lycoming 360-series engines. This is not just a cylinder; it is a comprehensive kit containing all the primary components required to restore the power-producing capability of one cylinder to zero-time, factory-new condition. Featuring a nitrided steel barrel for exceptional durability and including a matched high-compression piston, ring set, and all necessary gaskets, this kit is the gold standard for performing a proper top overhaul or cylinder replacement.

Key Features

• Nitrided Steel Barrel: The cylinder barrel undergoes a nitriding process, a specialized case-hardening heat treatment. This creates an extremely hard, wear-resistant surface that provides superior protection against corrosion and ensures a longer service life with reduced oil consumption.
  
• Complete & Matched Assembly: This kit includes a brand-new cylinder assembly (with valves, guides, seats, springs, and retainers pre-installed), a perfectly matched high-compression piston with piston pin and plugs, and a complete set of piston rings. This factory matching ensures optimal compression, heat transfer, and oil control.
• All-Inclusive Gasket Set: Comes complete with all the necessary gaskets and seals for the installation of one cylinder, including the cylinder base O-ring, rocker cover gasket, intake sleeve and gasket, and exhaust gasket. This eliminates the hassle of ordering multiple small parts.
• Genuine Lycoming OEM Part: As a genuine factory kit, every component is guaranteed to meet the stringent material, manufacturing, and quality control standards of Lycoming's FAA Production Certificate. This is the a way to ensure the part conforms to the engine's original Type Certificate.
• Ready for Installation: The kit is delivered ready for a certified mechanic to perform the final piston ring gapping and assembly, significantly reducing the labor and complexity compared to overhauling an old cylinder.

Technical Specifications

• Part Number: 05K21262
• Component Type: Cylinder Power Assembly Kit
• Cylinder Barrel Type: Nitrided Steel
• Piston Type: High-Compression (9.0:1)
• Kit Contents:
  • 1x Complete Cylinder Assembly (Valves, Guides, Seats, Springs Installed)
  • 1x Piston (for 9.0:1 Compression Ratio)
  • 1x Piston Pin & Plugs
    
  • 1x Piston Ring Set (Compression and Oil Control Rings)
  • 1x Gasket Kit (for one cylinder)
• Certification: FAA Production Approval

Aircraft Compatibility

The 05K21262 kit is the specified replacement for a range of high-compression Lycoming 360-cubic-inch, parallel-valve engines, often used in aerobatic or high-performance aircraft. It is imperative to consult the specific engine's Illustrated Parts Catalog (IPC) to verify the correct kit for your engine model.

• Common Lycoming Engine Series:
  • AEIO-360 (B series)
  • HIO-360 (C series)
  • IO-360 (M1A)
• Common Aircraft Platforms:
  • Piper: PA-28R-201T Turbo Arrow III, PA-28RT-201T Turbo Arrow IV
  • Cessna: 172XP Hawk XP II
  • Robinson: R22 Helicopter (with O-360 variant)
  • Numerous high-performance and aerobatic experimental aircraft.

Applications

The 05K21262 kit is the premier solution for critical engine maintenance:

• Top Overhaul: The ideal choice when low compression, high oil consumption, or internal corrosion necessitates the replacement of one or more cylinders.
• Engine Overhaul: The foundation of a "new limits" engine overhaul, ensuring all power-producing components are brand new.
• Performance Restoration: Upgrading to new, factory-matched high-compression cylinder kits is the best way to restore an engine to its original factory horsepower and efficiency specifications.

Why Choose 05K21262?

The health of an engine is determined by the integrity of its cylinders. Using a complete, factory-matched Lycoming kit like the 05K21262 is the single best way to guarantee performance and reliability. It eliminates the variables and potential compatibility issues of using overhauled cylinders or sourcing individual parts. The nitrided barrel provides a significant durability advantage over older cylinder types, ensuring better long-term value and engine performance. For a component this central to the function and safety of your aircraft, there is no substitute for a genuine Lycoming factory-new kit.

Order Your 05K21262 Cylinder Kit Now

Restore the power, efficiency, and reliability of your high-performance engine with a genuine, factory-new cylinder kit from Lycoming. Visit Airparts.aero to inquire about 05K21262 power assembly kits today.

The nitriding process applied to the Lycoming 05K21262 cylinder barrel is a thermochemical case-hardening process. The steel barrel is heated in a specialized atmosphere containing nitrogen. Nitrogen atoms diffuse into the surface of the steel, forming hard, stable nitride compounds. This creates a "case" on the surface that is significantly harder (often exceeding 65 HRC) than the base steel, providing an exceptionally wear-resistant surface for the piston rings. Unlike chrome plating, nitriding is a diffusion process, not a coating, so it will not flake, peel, or chip. This results in a much faster and more effective break-in period, superior oil retention due to the microscopic porosity of the surface, and a dramatic increase in the cylinder's service life, especially in preventing corrosion pitting.

Note: This is a flight-critical engine component. Installation must be performed by a certified A&P mechanic in strict accordance with the current Lycoming Overhaul Manual and relevant Service Instructions. Proper break-in procedures must be followed after installation to ensure correct seating of the new piston rings.

ELIGIBILITIES

AirParts stocks thousands of engine and engine overhaul parts. Cranks, cases, cams, cylinders, and more. Most available on exchange programs.