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Old 19 May 2019, 10:54   #1
Country: UK - England
Town: Ipswich
Boat name: Click and Collect
Make: Valiant and Narwhal
Length: 4m +
Engine: Outboard
Join Date: Sep 2016
Posts: 1,107
Why these 2 holes

On my little Mercury 15 hp 2 stroke when it is on full tilt up I noticed gearbox oil running down the leg. Upon further inspection it is running out of two holes which obviously should be there (one each side) which you can see in the attached pics.

I am somewhat confused because if gear oil can come out water can surely get in.

Someone must know what these are and if they should be plugged ?

Thanks in advance
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Bigplumbs is offline   Reply With Quote
Old 19 May 2019, 13:02   #2
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Nos4r2's Avatar
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 12,833
Are you sure it's gearbox oil?
Wipe it up on a clean bit of tissue and post a pic.
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Old 19 May 2019, 13:32   #3
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 2,440
Looks like a weep hole to drain water from the lower part of the leg are you sure its not just 2 stroke residue
If not its most likely the top seal or shift shaft seal leaking out the top of the box
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Old 19 May 2019, 15:04   #4
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Country: UK - England
Make: Avon Searider SR4
Length: 4m +
Engine: Yamaha 50
Join Date: Jan 2004
Posts: 5,767
As stated, most likely two stroke residue draining through two drain holes in the leg. Pretty normal. You'll notice it if you run the engine up in a bucket - the water will have a film of it all over the top.
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