SL75413A-P010 - Superior Air Parts FAA-PMA Piston .010 Over

SL75413A-P010 – Superior Air Parts FAA-PMA Piston, +.010" Oversize

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Overview

The Superior Air Parts SL75413A-P010 is a high-strength, forged, FAA-PMA certified +.010 inch oversize piston. This is a flight-critical component engineered specifically for the overhaul and repair of Lycoming O-320 series engines. During a major engine overhaul, cylinder barrels that are worn beyond their standard service limits are often machined and honed to a precise first oversize dimension. This SL75413A-P010 piston is manufactured to be .010" larger than the standard diameter to perfectly match this refurbished cylinder bore. This process is essential for restoring the engine's original factory clearances, ensuring proper compression, effective oil control, and a full service life for the overhauled engine.

As a direct replacement for Lycoming part number 75413 (in its +.010 oversize configuration), this piston is manufactured via a forging process from a high-silicon aluminum alloy. This method creates a component that is substantially stronger and more resistant to fatigue and thermal stress than cast pistons. As a fully FAA-PMA approved part, it has undergone a rigorous certification process to prove that its design, material, and performance are equal to or better than the original, making it the premier choice for professional engine builders.

Key Features

• FAA-PMA Certified: A fully certified, airworthy component approved for a wide range of Lycoming O-320 engines.

• +.010" Oversize Specification: Specifically engineered for use in cylinder barrels that have been bored and honed to the first oversize dimension during a major overhaul.

• High-Strength Forged Construction: Forged from a high-silicon aluminum alloy, providing a superior grain structure that is far stronger and more durable than cast pistons.

• Precision Machining & Weight Matching: CNC-machined to exacting tolerances for dimensional accuracy and weight, ensuring a perfectly balanced and smooth-running engine when installed as a set.

• Restores Factory Clearances: Enables the engine overhauler to restore the precise, critical piston-to-cylinder wall clearance required for optimal performance and longevity.

Technical Specifications

• Part Number: SL75413A-P010

• Component Type: Engine Piston, Oversize

• OEM Manufacturer: Superior Air Parts, Inc.

• Certification: FAA-PMA (Replaces Lycoming P/N 75413, +.010" Oversize)

• Oversize Specification: +.010 inches

• Application: Lycoming O-320 Series Engines (150 & 160 HP variants)

• Material: Forged, High-Silicon, Low-Expansion Aluminum Alloy.

Aircraft Compatibility

The SL75413A-P010 is specified for use in numerous 150 HP and 160 HP variants of the Lycoming O-320 engine series. These engines are the workhorse of general aviation, powering a vast fleet of aircraft, including:

• Cessna: 172

• Piper: PA-28 Cherokee, Warrior, Caribbean

• Grumman American: AA-5 Traveler

• Mooney: M20

• Many other factory-built and experimental aircraft.

Note: This is a flight-critical engine component. The specific engine Overhaul Manual and Illustrated Parts Catalog (IPC) for a given engine serial number are the final and absolute authorities for determining part applicability.

Applications

• Engine Overhaul: The definitive piston for use in Lycoming O-320 series engine cylinders that have been machined to the +.010 inch oversize dimension.

• Cylinder Repair: Used when replacing a single cylinder that has been refurbished to oversize limits.

Why Choose SL75413A-P010?

A proper engine overhaul is a precision process that restores an engine to its original factory specifications. The Superior Air Parts SL75413A-P010 is an essential part of this process. Its forged construction offers a clear advantage in strength and reliability over many original cast pistons. The rigorous FAA-PMA certification provides the absolute assurance that this oversize piston is a safe, airworthy, and dimensionally correct component. Using anything less than a certified, precision-manufactured oversize piston in a refurbished cylinder would negate the entire overhaul process, leading to poor performance and a drastically shortened engine life.

The use of the SL75413A-P010 oversize piston is a critical step in the restoration of an engine cylinder's tribology. During an overhaul, a worn steel cylinder barrel is first bored to remove material and create a new, perfectly round surface. This surface is then honed, a process which creates a precise cross-hatch pattern of microscopic peaks and valleys. This pattern is engineered to retain a thin film of oil on the cylinder wall, which is essential for lubricating the piston rings. The new rings on the oversize piston must then "seat" against this surface, a controlled wear-in process that creates a near-perfect, gas-tight seal. The SL75413A-P010 is the precisely matched diametrical component required to complete this system. It re-establishes the exact piston-to-cylinder wall clearance needed to allow for thermal expansion while ensuring the new rings are correctly supported as they conform to the freshly honed, oil-retaining surface.

Note: The SL75413A-P010 is a flight-critical engine component intended for use by certified A&P/IA mechanics or professional engine overhaul facilities. It must be installed in a cylinder that has been properly machined and honed to the +.010 inch oversize specification. Pistons should always be installed as a complete, weight-matched set with new piston rings, a new piston pin, and new pin plugs. All work must be performed in strict accordance with the Lycoming Overhaul Manual.

Documentation

• Superior Air Parts, Inc. Website: Full eligibility lists, installation instructions, and technical data for this FAA-PMA part are available on the official Superior Air Parts website.