The ST71 valve guide gauge is a precision aviation maintenance measuring tool used to inspect and verify the internal diameter, wear limits, and alignment of engine valve guides. It is commonly used during aircraft piston engine overhaul and inspection procedures to ensure valve train components remain within manufacturer tolerances.

This gauge helps technicians determine whether a valve guide is within service limits or requires repair/replacement, ensuring proper valve seating, compression, and engine performance.

Key features include:

Precision engine inspection gauge tool
Used for measuring valve guide internal diameter and wear
Ensures compliance with engine manufacturer tolerances
Supports aircraft piston engine overhaul and inspection work
Designed for use in certified maintenance environments
Helps verify valve alignment and guide condition
Typically used in Continental and Lycoming-style engine servicing (model dependent)
Durable hardened steel construction for repeatable accuracy
Suitable for MRO (maintenance, repair, overhaul) facilities
Essential tool for engine health assessment and valve system diagnostics