13S19647 - Lycoming Engines OEM Crankshaft Gear

13S19647 – Lycoming Engines OEM Crankshaft Gear

Available now on the Airparts.aero Marketplace.

Overview

The Lycoming 13S19647 is a genuine OEM crankshaft gear, a flight-critical component that serves as the primary drive gear for the Lycoming O-235 series of aircraft engines. This precision-machined gear is installed on the rear of the crankshaft and is fundamentally responsible for the synchronized operation of the entire engine. It transmits the crankshaft's rotation to the camshaft for valve timing and drives the entire accessory gear train. Manufactured from a high-strength, case-hardened steel alloy, the 13S19647 is engineered to provide absolute reliability for thousands of hours of service.

Key Features

• Master Timing Component: This is the central drive gear in the engine. It directly meshes with the camshaft gear, establishing the precise 2:1 ratio required to synchronize the opening and closing of the engine's valves with the piston's movement.
• Accessory Drive Function: Initiates the power transmission through the accessory gear train, driving essential engine components including the dual magnetos and the oil pump.
• Case-Hardened Steel Construction: Fabricated from a high-strength steel alloy and then case-hardened. This process creates an extremely hard, wear-resistant outer surface on the gear teeth while maintaining a more ductile core to resist shock loads and prevent tooth fracture.
• Precision Machined: The gear teeth are hobbed and ground to a precise involute profile, ensuring smooth, quiet operation and an even distribution of loads between meshing gear teeth, which is critical for preventing premature wear.
• Genuine Lycoming OEM Part: As a genuine factory component, it guarantees conformance to Lycoming's stringent metallurgical standards, heat treatment processes, and quality control, ensuring the highest level of safety and performance for your O-235 engine.

Technical Specifications

• Part Number: 13S19647
• Component Type: Crankshaft Gear
• Material: Case-Hardened Steel Alloy
• Primary Function: Drives Camshaft and Accessory Gear Train
• Installation: Press-fit or shrink-fit onto the rear of the crankshaft, located by a dowel pin.
• Features: Includes timing marks for proper engine assembly.
• Certification: FAA Production Approval

Aircraft Compatibility

The Lycoming 13S19647 is the specified crankshaft gear for the highly reliable and widely used Lycoming O-235 series of 4-cylinder engines.

• Primary Engine Series:
  • Lycoming O-235
• Common Aircraft Platforms:
  • Cessna 152
  • Piper PA-38 Tomahawk
  • Grumman American AA-1 Trainer
  • American Champion 7ECA Citabria

Applications

The 13S19647 is a fundamental component for engine assembly and overhaul:

• Engine Timing & Synchronization: Its installation is a critical step in setting the engine's internal valve timing, which is fundamental to the engine's ability to produce power efficiently and run smoothly.
• Engine Overhaul: A mandatory inspection item during any engine overhaul. It is inspected for pitting, scoring, and tooth wear, and replaced if any out-of-limit conditions are found to ensure the reliability of the rebuilt engine.

Why Choose 13S19647?

The crankshaft gear is the single component responsible for driving every other timed event and accessory in the engine. Its failure would be instantaneous and catastrophic, leading to a complete loss of engine power. Using a genuine Lycoming 13S19647 OEM gear is the only way to ensure the part has the correct material composition, case hardening depth, and tooth profile specified by the engine's designers for the O-235. The risks associated with using a non-certified part with an unknown history or material pedigree are unacceptable. For any professional engine build, the integrity of this gear is paramount.

Order Your Lycoming 13S19647 Crankshaft Gear Now

Build your O-235 engine with the proven reliability and certified quality of genuine Lycoming components. Visit Airparts.aero to order your 13S19647 crankshaft gear today.

The 13S19647 crankshaft gear is the first component in the engine's complex gear reduction and power transmission system. The crankshaft rotates at engine RPM, and this gear, having a specific number of teeth, meshes with the camshaft gear, which has exactly twice the number of teeth. This creates a precise 2:1 reduction, ensuring the camshaft—and by extension, the valves—operate at exactly half of crankshaft speed, which is required for a four-stroke engine cycle. The 13S19647 also meshes with an idler gear, which then drives the magneto gears. The precise geometry and backlash between the 13S19647 and these mating gears is critical for quiet operation and long component life.

Note: This is a flight-critical engine internal component. Installation must be performed by a certified A&P mechanic or at a qualified engine overhaul facility in strict accordance with the current Lycoming Overhaul Manual for the O-235 engine. The installation process typically requires specialized tools and heating/cooling procedures to achieve the proper shrink fit onto the crankshaft.