Mercury recommends that boaters remove their lower unit every 3 years or 300 hours as part of regular maintenance, largely to address any corrosion or other issues that may develop over time.
In this video, Frank walks you through how to remove the Mercury outboard gear lube case, what to look for during the process, and how to replace the lower unit when you're finished.
0:00 | Tips before you get started
1:15 | Removing the mounting bolts & washers
2:05 | Removing the lower unit
3:15 | Preparing to reinstall the lower unit
4:37 | Reinstalling the lower unit
This how-to video applies to Mercury outboard models
For more on the topic, read the guide!
https://www.partsvu.com/blog/how-to-remove-a-mercury-outboard-lower-unit/
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