Description
The Oil Fill Screw Plug Seal 311598 is an OEM sealing washer used on select OMC, Johnson and Evinrude outboard gearcases, including the SST-45 Racing Gearcase.
This seal fits the lower unit oil fill screw and helps create a secure seal between the screw and the gearcase housing. A worn, compressed, damaged, or missing seal can allow gear lubricant to leak out or water to enter the lower unit.
Replacing the oil fill screw seal during routine gearcase maintenance is a simple and inexpensive step that can help protect internal lower unit components and maintain proper lubrication.
Product Features
- Replacement oil fill screw plug seal
- Used on select OMC, Johnson and Evinrude outboard gearcases
- Helps prevent gear oil leaks
- Helps reduce the chance of water entering the lower unit
- Ideal for lower unit oil changes and routine gearcase maintenance
- Useful for recreational, performance, and race outboard applications
Recommended Service
Inspect the oil fill and drain screw seals whenever changing lower unit gear oil. Seals that appear flattened, cracked, brittle, torn, or excessively compressed should be replaced before reinstalling the screw.
For best results, verify your engine model, gearcase configuration, and original part number before ordering to confirm compatibility.
