Description
Mercury 8M0205728 Inner Prop Shaft Oil Seal
Mercury 8M0205728 is the inner oil seal used in specified propeller shaft and bearing carrier assemblies. It replaces Mercury part 70080 and is sold individually for gearcase service.
Product Details
- Brand: Mercury
- Part number: 8M0205728
- Also referenced as: 26-8M0205728
- Position: inner prop shaft oil seal
- Replaces: 70080 / 26-70080
- Quantity: one seal
Confirm Fitment
Use this seal only where your engine or gearcase parts diagram specifies 8M0205728 or its superseded number 70080. Confirm the engine serial number, gearcase design and seal position before ordering. Inner and outer seals are separate parts; this listing supplies the inner seal only.
What’s Included
One Mercury 8M0205728 inner prop shaft oil seal. This is an individual replacement part, not a complete gearcase seal kit.
Installation Notes
Follow the service manual for bearing carrier disassembly, seal orientation, installation depth and lubrication. Inspect the shaft and carrier sealing surfaces during service and perform the specified gearcase pressure and vacuum checks after repair.

