Mercury 40 FourStroke Maintenance And Installation Manual page 81

2. Place a drain pan below the outboard.
3. Remove the vent plugs and fill/drain plug and drain the lubricant.
Gearcase Lubricant Capacity
Gearcase lubricant capacity is approximately 710 ml (24 fl oz).
Checking Lubricant Level and Filling Gearcase
1. Place the outboard in a vertical operating position.
2. Remove the front vent plug and rear vent plug.
3. Place the lubricant tube into the fill hole and add lubricant until it appears
at the front vent hole. At this time install the front vent plug and sealing
washer.
4. Continue adding lubricant until it appears at the rear vent hole.
5. Stop adding lubricant. Install the rear vent plug and sealing washer before
removing the lubricant tube.
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MAINTENANCE
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Vent plugs
Fill/drain plug