61173 - Lycoming™ OEM Oil Pressure Filter Housing Gasket

61173 – Lycoming™ OEM Oil Pressure Filter Housing Gasket

Available now on the Airparts.aero Marketplace.

Overview

This is the genuine Lycoming Original Equipment Manufacturer (OEM) oil pressure screen housing gasket, a flight-critical sealing component for nearly all Lycoming piston aircraft engines. While often referred to by the base number 61173, the official Lycoming part number is 77412 (superseding LW-13385). As the authentic factory part, this gasket is manufactured from the exact material compound and to the precise dimensional tolerances specified by Lycoming engineers during engine design and certification. Its sole function is to provide a perfect, leak-proof seal for the oil pressure screen housing, ensuring the integrity of the engine's high-pressure lubrication system.

Key Features

• Genuine Lycoming Factory Part: This is the original, factory-certified part that your engine was built and certified with. It guarantees absolute conformance with the latest engineering drawings, material specifications, and quality control standards.
• Proprietary Composite Material: Fabricated from Lycoming's specified rubber-fiber composite material. This compound is chosen for its ideal compressibility, tensile strength, and chemical stability when exposed to high-temperature mineral and synthetic aviation oils, preventing leaks and seepage.
• Optimized Compression & Seal: Engineered for a perfect "crush" when the housing bolts are torqued to the factory specification. This creates a positive, high-pressure seal that will not extrude or creep over time, even under constant thermal and pressure cycling.
• Single-Use Design for Maximum Safety: Designed as a mandatory single-use component. The initial installation compresses and forms the gasket to the specific mating surfaces. Reusing a gasket can lead to a significant oil leak, making replacement at every service a critical safety procedure.
• The Standard for Airworthiness: Using the genuine Lycoming gasket ensures the engine remains in full compliance with its original Type Certificate. For a flight-critical seal, this is the ultimate assurance of quality and airworthiness.

Technical Specifications

• Common Reference Part Number: 61173
• Official Lycoming Part Number: 77412 (supersedes LW-13385)
• Component Type: Oil Pressure Screen Housing Gasket
• Material: Lycoming-Specified Rubber-Fiber Composite
• Primary Fluid Compatibility: All approved Lycoming Piston Engine Lubricating Oils
• Certification: Lycoming Engines Factory Certification / FAA Production Approval

Aircraft Compatibility

This is the genuine OEM gasket for the oil pressure/suction screen housing on the majority of Lycoming piston engines, from the smallest four-cylinder to the largest six-cylinder powerplants.

• Common Engine Series:
  • O-235
  • O-320, IO-320, LIO-320
  • O-360, IO-360, LIO-360, AIO-360, HIO-360
  • O-540, IO-540, TIO-540, LIO-540, AEIO-540
  • And virtually all other Lycoming piston engine families.

Applications

The Lycoming 77412 gasket is an essential component for routine engine maintenance and overhaul:

• Oil Screen Inspection: A mandatory replacement part whenever the oil pressure screen housing is removed to inspect the "last chance" filter for metallic debris—a critical step in monitoring engine health, typically performed at every oil change.
• Preventing External Oil Leaks: The sole component responsible for sealing this pressurized joint. A failed gasket will result in a messy and potentially hazardous external oil leak.
• Engine Overhaul: The only factory-approved gasket for use during the final assembly of the accessory case.

Why Choose Lycoming OEM?

While FAA-PMA parts are certified to be an acceptable replacement, the genuine Lycoming 77412 gasket is the part that sets the standard. It is the exact component your engine was tested and certified with, guaranteeing a perfect match to the material properties and performance characteristics intended by the original designers. For owners and mechanics who accept no compromises, the genuine Lycoming gasket provides the ultimate peace of mind that the seal is identical to what the factory installed.

Order Your Genuine Lycoming Gaskets Now

Maintain your engine to the highest factory standards with genuine, original equipment manufacturer components. Visit Airparts.aero to order your Lycoming 77412 oil pressure screen housing gaskets today.

The oil pressure screen housing is a critical access point for inspecting the health of the engine. The screen itself is designed to capture larger ferrous and non-ferrous particles, providing the first indication of an abnormal internal wear event (such as a failing bearing or spalling camshaft). Because this housing must be removed frequently for inspection, the genuine Lycoming 77412 gasket is designed to provide a perfect seal under repeated assembly cycles (with a new gasket each time). The rubber-fiber composite material is chosen for its ability to create a seal with a relatively low seating stress, meaning the housing doesn't need to be excessively torqued to prevent leaks. This prevents thread-stripping damage to the much more expensive engine accessory case, a common issue when incorrect or hardened gaskets are used.

Note: This is a single-use gasket. It must be replaced every time the oil screen housing is removed. Ensure both mating surfaces on the engine case and the housing are clean, dry, and free of old gasket material before installation. Tighten the housing or cap screws to the torque value specified in the current Lycoming maintenance manual or service publication.Alternate part numbers:
Continental Aerospace Technologies - AEL61173
Superior Airparts - SL-6117

NOTES: MATERIAL COMPOSITION SYNTHESEAN 60 MONTHS S/L PER LYCOMING SL L247H

Fits for the following Lycoming™ Engine models:

**Lycoming™ Engines Parts Catalog   [ Click Here ]

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