The 654070 crankshaft oil seal spring is a small OEM retaining spring used within Continental aircraft engine crankshaft oil seal assemblies. Its function is to maintain radial tension on the lip of the crankshaft oil seal, ensuring consistent contact pressure against the rotating shaft. This helps prevent engine oil leakage while allowing smooth crankshaft rotation under high-speed and high-temperature operating conditions.

It is typically installed inside or behind the crankshaft front or rear oil seal depending on engine configuration, and is a critical supporting element of the overall sealing system rather than a standalone sealing surface.

Key features include:

Genuine Continental OEM oil seal retaining spring
Precision-formed high-tension spring steel construction
Maintains constant radial pressure on crankshaft oil seal lip
Helps prevent oil leakage from crankcase under pressure
Designed for continuous high-RPM rotation environments
Resistant to heat cycling and oil exposure in aviation engines
Works as part of crankshaft front/rear seal assembly system
FAA-approved aircraft engine sealing component
Used in Continental piston engine overhaul and maintenance procedures
Ensures long-term sealing reliability in crankshaft housing interfaces