LW-15032 - Lycoming Engines OEM Tachometer Shaft Assembly

LW15032 – Lycoming Engines OEM Tachometer Shaft Assembly

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Overview

The Lycoming LW15032 is a genuine OEM tachometer shaft assembly, a precision-machined component that serves as the critical mechanical linkage for the engine's RPM indicating system. This shaft is housed within the accessory case and is driven directly by the engine's internal gear train (typically the camshaft). Its purpose is to transfer the engine's rotational motion to the external tachometer drive cable, which in turn drives the mechanical tachometer in the cockpit. Manufactured from high-strength, case-hardened steel, the LW15032 is designed for exceptional durability and the accurate transmittal of engine speed information to the pilot.

Key Features

• Precision-Machined Gear: Features an integral, precision-cut gear designed to mesh perfectly with the engine's camshaft or accessory drive gear, ensuring accurate and slip-free rotation.
• Case-Hardened Steel: Fabricated from a high-grade steel alloy and case-hardened for extreme durability. This process creates a super-hard outer surface that resists wear from gear contact and rotation, while maintaining a softer, more ductile core to resist shock and fracture.
• Tachometer Drive Interface: The shaft terminates in a standardized square or keyed drive receptacle, designed to accept the mechanical tachometer drive cable, providing a secure and reliable connection for the RPM signal.
• Engineered for Accuracy: As a core component of the mechanical instrumentation system, its gear ratio and dimensions are precisely controlled to ensure the RPM displayed in the cockpit accurately reflects the true speed of the engine.
• Genuine Lycoming OEM Part: As a genuine factory part, it guarantees conformance to Lycoming's stringent metallurgical, heat treatment, and dimensional specifications, ensuring the highest level of reliability and airworthiness.

Technical Specifications

• Part Number: LW15032
• Component Type: Tachometer Drive Shaft Assembly
• Material: Case-Hardened Steel Alloy
• Drive Mechanism: Integral Gear
• Output Drive: Square or Keyed Receptacle for Mechanical Tachometer Cable
• Installation Location: Engine Accessory Case
• Certification: FAA Production Approval

Engine Compatibility

The Lycoming LW15032 tachometer drive shaft is specified for use across a very wide range of Lycoming's most popular direct-drive engines, both carbureted and fuel-injected. It is essential to consult the specific engine's Illustrated Parts Catalog (IPC) to verify the correct part number.

• Common Engine Series:
  • O-235
  • O-320, IO-320
  • O-360, IO-360, AIO-360, AEIO-360
  • O-540, IO-540, AEIO-540
  • IO-720

Applications

The LW15032 is an essential component for the primary flight instrumentation system:

• RPM Indication: Its sole purpose is to drive the mechanical tachometer, providing the pilot with a primary instrument for setting power and monitoring engine health.
• Engine Overhaul: A critical inspection item during any engine overhaul. It is inspected for gear tooth wear, scoring, or twisting and replaced if any out-of-limit conditions are found.
• Accessory Case Repair: Replaced during repairs to the accessory case or if the tachometer drive system is found to be inoperative or providing erratic readings.

Why Choose LW15032?

Accurate engine RPM indication is not just a matter of convenience; it is critical for safe flight operations, from setting takeoff power to leaning the engine in cruise. The Lycoming LW15032 is the only part certified by the manufacturer to provide an accurate mechanical output for the tachometer. Using a genuine OEM shaft ensures correct gear meshing, proper material hardness to prevent premature wear, and reliable performance. For a component this integral to engine monitoring, there is no substitute for the quality and peace of mind that comes from using a genuine Lycoming part.

Order Your LW15032 Tachometer Shaft Assembly Now

Ensure your primary engine instrumentation is accurate and reliable with genuine Lycoming parts. Visit Airparts.aero to order your LW15032 tachometer shaft assembly today.

The Lycoming LW15032 tachometer drive is part of a simple and robust mechanical system. It is typically driven off a helical gear on the engine's camshaft. The shaft itself is supported by a bronze bushing pressed into the accessory case. A seal is used to prevent oil from leaking past the shaft and out of the accessory housing. The accuracy of the system is a direct function of the gear ratio between the crankshaft, the camshaft, and the LW15032's integral gear. Any wear on the gear teeth of the LW15032 can lead to erratic tachometer indications (needle waiver) or a complete failure of the instrument, underscoring the importance of inspecting this component and its mating gear during overhaul.

Note: This is an engine internal component. Installation must be performed by a certified A&P mechanic, typically during engine overhaul or accessory case repair, in strict accordance with the current Lycoming Overhaul Manual for the specific engine model.