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Old 19 May 2019, 10:54   #1
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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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Old 19 May 2019, 13:02   #2
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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
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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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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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