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Old 10 April 2014, 15:26   #1
Country: UK - England
Town: Brighton
Make: Zodiac
Length: under 3m
Join Date: Mar 2014
Posts: 4
Starting Mercury Outboard after 20+ years


I have an old mercury 4hp 1977 GNAT outboard that has been sitting in our garage for 20+ years without any use. The outboard was drained of fuel when left and I have checked the plugs which appear to be in good condition.

I was planning to:
- add a couple of drops of TCW3 oil into each cylinder
- Change the gear oil
- replace the water impeller

Is there anything else I should do before starting the engine?

Also is all gear oil the same? (the manual quotes quicksilver 92-13783A24 which seems to be hard to find.)

Thanks for any help

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Old 10 April 2014, 17:07   #2
Locozodiac's Avatar
Country: Other
Town: Lima-Peru
Boat name: Nautile
Make: Sea Rider Boats
Length: 4m +
Engine: Tohatsu 18 /30 HP
Join Date: Sep 2007
Posts: 1,706
Is the carb immaculate clean inside ? let's hope you don't have a stuck piston already. If so will need to soak piston in W-40 or any other penetrating product for some time untill frees itself.

All gear oils are SAE multigrade 80/90 or 90 fixed grade ones. Can use any.

Happy Boating
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