Honda Marine BF40A Owner's Manual page 85

10. MAINTENANCE
DRAIN PLUG
2. Loosen the drain plug cover screw
using a flat blade screwdriver and
remove the drain plug cover.
DRAIN PLUG
3. Place the drain plug cover as shown
to use it as an oil drain guide. Place a
suitable container under the guide.
4. Remove the engine oil drain bolt
and washer using a 12 mm wrench
and drain the engine oil.
5. Install a new sealing washer on the
drain bolt and tighten the bolt
securely.
6. Reinstall the drain plug cover.
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