The 658077 is an exhaust hydraulic lifter (tappet) used in Continental aircraft piston engines. It forms part of the valve train system and automatically maintains correct valve lash while transmitting camshaft motion to the exhaust valve mechanism.

Key features include:

OEM Continental hydraulic lifter (exhaust side)
Self-adjusting hydraulic design to maintain zero valve clearance
Precision-machined steel body with internal hydraulic plunger system
Maintains continuous contact between camshaft and exhaust valve train
Designed for high-temperature exhaust valve operation environment
Lubricated via engine oil pressure system
Reduces valve train wear and operational noise
Used in Continental IO/TSIO engine families (model-dependent IPC application)
FAA-certified engine valve train component