2646-00052 - Textron Aviation OEM Oil Pressure Gauge

2646-00052 – Textron Aviation OEM Direct-Reading Oil Pressure Gauge

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Overview

The 2646-00052 is a flight-critical, direct-reading mechanical oil pressure gauge, supplied as a genuine Textron Aviation Original Equipment Manufacturer (OEM) part. This instrument is a primary indicator of engine health, providing the pilot with a continuous, real-time display of the engine's lubricating oil pressure. Its operation is based on a robust and time-tested Bourdon tube mechanism, which requires no electrical power, making it a completely independent and reliable indicator that will continue to function even in the event of a total aircraft electrical failure.

As a genuine Textron Aviation component, this gauge is manufactured to the exact specifications required for its application, including a precisely calibrated pressure range and the correct color-coded operating arcs and red lines for the specific aircraft and engine combination. The integrity of an engine's oil system is paramount, and this OEM gauge provides the accurate, trustworthy information necessary for safe engine operation.

Key Features

• Genuine Textron Aviation OEM Part: Guarantees the instrument is the factory-specified and fully certified component, ensuring accuracy, correct range markings, and airworthiness.

• Direct-Reading Mechanical Gauge: Pressurized engine oil is fed directly to the instrument, providing a direct, un-intermediated measurement of system pressure for maximum reliability.

• Bourdon Tube Mechanism: Utilizes a simple, robust, and exceptionally reliable Bourdon tube design that translates fluid pressure directly into mechanical needle movement.

• Requires No Electrical Power: The gauge's operation is purely mechanical, making it a critical instrument that remains functional during any electrical system malfunction or failure.

• Color-Coded Range Markings: Features a screen-printed dial face with the specific green arc (normal operating range) and red lines (minimum/maximum pressure) as required by the aircraft's Type Certificate Data Sheet (TCDS).

• Flight-Critical Engine Instrument: Provides the primary indication of oil system health; a loss of oil pressure is a critical in-flight emergency.

Technical Specifications

• Part Number: 2646-00052

• Component Type: Direct-Reading Oil Pressure Gauge

• OEM Authority: Textron Aviation (Cessna)

• Underlying Manufacturer (Typical): Stewart-Warner, Rochester Gauges, or other approved supplier.

• Principle of Operation: Bourdon Tube (Mechanical)

• Pressure Range: Per Textron specification for the application (e.g., 0-120 PSI).

• Markings: Green Arc, Red Lines, and numerical graduations per the specific aircraft POH/TCDS.

• Governing Specification: Textron Aviation Engineering Drawing 2646.

Aircraft Compatibility

This OEM oil pressure gauge is the specified instrument for a wide variety of Textron Aviation (Cessna) single-engine piston aircraft.

• Primary Cessna Platforms:

  • Cessna 152

  • Cessna 172

  • Cessna 182

  • Other single-engine piston models.

Note: Verification of applicability is the absolute responsibility of the installer. The aircraft's current Illustrated Parts Catalog (IPC) for its specific serial number is the final authority for confirming part number eligibility.

Applications

• Sole Application: To provide a continuous, real-time display of engine lubricating oil pressure to the pilot, allowing for monitoring of engine health and the immediate identification of oil system malfunctions.

Why Choose 2646-00052?

The oil pressure gauge is arguably one of the most critical instruments in a piston-engine aircraft. It provides the first and often only warning of an impending catastrophic engine failure due to oil starvation. The genuine Textron OEM 2646-00052 gauge is the only part guaranteed to be calibrated correctly, have the correct and legal range markings for the specific aircraft model, and be built to the vibration, accuracy, and quality standards required for certification. Using an uncertified, automotive, or incorrect gauge could lead to a fatal misinterpretation of engine health in a critical situation.

The operational principle of the 2646-00052 gauge is the Bourdon tube, a masterpiece of simple, reliable mechanical engineering. The "tube" is a C-shaped or helical tube of non-circular (typically elliptical) cross-section, sealed at its tip. When pressurized oil enters the tube, the pressure acts on all interior surfaces. Due to the geometry, the surface area of the outer radius of the C-shape is larger than the surface area of the inner radius. This differential area results in a net outward force, causing the tube to elastically deform and attempt to straighten. This uncurling motion of the sealed tip is a precise and repeatable function of the applied pressure. This minute movement is captured by a delicate linkage, often supported by jewel bearings to minimize friction, and amplified through a geared sector and pinion mechanism that drives the indicator needle across the calibrated dial. This entire system provides an accurate pressure reading without any need for external power.

Note: This is a flight-critical primary engine instrument. Installation must be performed by a certified A&P mechanic. The fluid line connecting to the back of the gauge is under full engine oil pressure and must be correctly installed and torqued to prevent leaks in the cockpit. The installed gauge must be the correct part number for the specific aircraft model to ensure the operating range markings are correct as per the Type Certificate Data Sheet (TCDS) and Pilot's Operating Handbook (POH).

Documentation

All technical data, installation procedures, and range markings for the 2646-00052 gauge are proprietary to Textron Aviation. This information is contained within the official Maintenance Manual and Illustrated Parts Catalog for the applicable aircraft model. No public-facing documentation is available.