651540 - Textron Aviation OEM Engine Oil Filter Element Assembly

651540 – Textron Aviation Engine Oil Filter Element

Available now on the Airparts.aero Marketplace.

The 651540 is the original Textron Aviation (Cessna) part number for the engine oil filter element used on a wide range of iconic Cessna aircraft equipped with Continental engines. This spin-on canister filter is a flight-critical component of the engine's lubrication system. Its sole function is to provide full-flow filtration, continuously removing harmful microscopic contaminants—such as metallic wear particles, carbon, and sludge—from the engine oil.

The protection of the engine's precision-machined internal components, including the crankshaft, camshaft, bearings, and cylinder walls, is directly dependent on the performance of this filter. It incorporates essential safety features, including an internal bypass valve and an anti-drain back valve, which are engineered to ensure reliable engine lubrication under all operating conditions. As a mandatory replacement item, using the correct, certified filter is a fundamental requirement for maintaining engine health and airworthiness.

Key Features

• OEM-Specified Part (Now Champion CH48110-1): The certified and approved filter for the application, ensuring correct fit, performance, and compliance.

• Integral Filter Bypass Valve: A critical safety feature that guarantees oil flow to the engine even in the event of a completely clogged filter element, preventing catastrophic oil starvation.

• Anti-Drainback Valve: A nitrile rubber diaphragm valve that prevents oil from draining out of the filter and oil galleries when the engine is shut down, ensuring rapid oil pressure development on the next startup.

• High-Efficiency Pleated Media: Features a resin-impregnated cellulose/synthetic filter media with a high pleat count to maximize surface area, providing excellent dirt-holding capacity and low pressure drop.

• Heavy-Duty Steel Canister: A robust, burst-resistant steel canister and heavy-gauge baseplate designed to withstand the high pressures and vibration of the aircraft engine environment.

Technical Specifications

• Original Part Number: 651540

• Component Type: Engine Oil Filter Element, Spin-On Canister

• OEM Manufacturer: Textron Aviation (original specifier)

• Filter Media: Resin-Impregnated Cellulose/Synthetic Blend.

• Internal Features: Pressure Relief Bypass Valve, Anti-Drainback Valve.

Aircraft Compatibility

The 651540 and its superseding part number CH48110-1 are specified for a large number of Textron Aviation (Cessna) aircraft equipped with specific Continental engines. Common models include, but are not limited to:

• Cessna 180, 182, 185, and 188 (with O-470 series engines)

• Cessna 205, 206, and 207 (with IO-520 series engines)

• Cessna 210 (with IO-470 and IO-520 series engines)

• Cessna 310 (with O-470 and IO-470 series engines)

Crucial Note: The specific aircraft model and engine serial number must be checked against the latest revision of the official Textron Aviation (Cessna) Illustrated Parts Catalog (IPC) to ensure correct filter part number applicability.

Applications

• Primary filtration for the engine lubrication system.

• Mandatory replacement item at every oil change or as specified by the aircraft's maintenance program.

The design of an aviation oil filter incorporates two critical, non-negotiable safety systems. The first is the filter bypass valve. This is a calibrated, spring-loaded poppet valve that remains closed during normal operation. Its purpose is to provide an alternate oil path in the event of a completely clogged filter element, a condition that would otherwise lead to total oil starvation and immediate engine seizure. The valve is engineered to open at a specific differential pressure (e.g., 12-15 psid), allowing unfiltered oil to flow directly to the engine. While unfiltered oil will cause accelerated long-term wear, it is infinitely preferable to the certain and immediate catastrophic failure caused by a complete loss of oil flow. The second system is the anti-drainback valve. This is typically a nitrile rubber diaphragm that seals the filter's inlet holes when the engine is shut down. This valve prevents the oil in the filter and the engine's upper galleries from siphoning back into the sump, ensuring that upon the next startup, these critical components are already primed with oil. This drastically reduces the time to establish normal oil pressure, minimizing engine wear during the critical startup phase.

Note: This is a flight-critical engine component. It MUST be replaced at every oil change or as directed by the maintenance manual. Before installation, a light film of clean engine oil must be applied to the rubber gasket. The filter should be hand-tightened and then torqued to the value specified in the maintenance manual (typically given as a fraction of a turn after gasket contact). The filter MUST be safety wired after installation. Installation must be performed by a certified A&P mechanic.

Documentation

The definitive part number applicability and all installation procedures are detailed in the applicable Textron Aviation (Cessna) Illustrated Parts Catalog (IPC) and Maintenance Manual for the specific aircraft model.