The 643626-110 pin is an OEM Continental aircraft engine crankshaft counterweight pin used in piston engine crankshaft assemblies. It serves as a precision locating and load-transfer pin that secures and aligns crankshaft counterweights, ensuring proper balance and smooth rotational operation of the crankshaft under high-RPM engine conditions.

This pin is a critical part of the crankshaft counterweight system and is installed with very tight tolerance fits to maintain dynamic balance and reduce vibration in certified aircraft piston engines.

Reference documentation confirms it as a crankshaft counterweight pin used alongside related components such as retaining plates (e.g., 653143) and retaining rings in Continental crankshaft assemblies. (Continental parts catalog, Aircraft Spruce)

Key features include:

Genuine Continental OEM crankshaft counterweight pin
Precision-machined hardened steel construction
1/4 inch diameter class fit for tight tolerance installation
Secures and aligns crankshaft counterweights
Ensures proper dynamic balance of rotating assembly
Designed for high-RPM and high-vibration aviation environments
Oil-lubricated and wear-resistant for long service life
Works with retaining plates and rings in crankshaft assemblies
FAA-approved critical engine rotating component
Used in Continental piston engine overhaul and assembly procedures