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Old 11 June 2009, 14:34   #1
Country: UK - England
Town: torquay
Boat name: none
Make: avon
Length: under 3m
Engine: 5hp honda
Join Date: May 2009
Posts: 6
mercury 8hp gear oil

hi,i have a mercury 8hp 2stroke outboard(2006)its just been servised but not sure if the correct amount of gear box oil has been used.....ive unscrewed the filler scew on top and leaned the motor over a fair way and no oil seems to come out,there is oil in it because if i undo the drain screw on the bottom new oil comes out.does it need to be full or is there a set amount that put in?

cheers rob

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Old 11 June 2009, 16:33   #2
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
Join Date: Dec 2006
Posts: 4,015
You are meant to undo both screws then squirt oil into the bottom hole until it starts to come out of the top hole.

The top hole is essentially your level.

Chris Stevens

Born fiddler
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Old 14 June 2009, 16:36   #3
m chappelow's Avatar
Country: UK - England
Town: yorkshire
Boat name: little vicky
Make: avon ex RNLI
Length: 3m +
Engine: tohatsu
Join Date: Mar 2008
Posts: 2,310
it could be that oil has come out of the top level plug when filled back up at servicing ,but then after a while it could have dropped down a bit owing to trapped air pockets or bubbles especialy if its been filled up too quickly,i usually turn the prop over a few times slowly after filling then check again with some engines its suprizing if left overnight how much you have to top up to get the correct level .
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