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post #1 of 10 (permalink) Old 10-07-2011, 04:42 PM Thread Starter
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Outboard leak

I have a well used '96 Merc 15hp and noticed an oil stain under the motor in the garage the other day. Had a previous stain/leak there but not this large. Any ideas on what it is from? Its coming out a hole that can be seen in the picture below. My manual shows the hole but doesn't specify what its for.
Any explanation and possible fix appreciated

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post #2 of 10 (permalink) Old 10-07-2011, 05:27 PM
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Re: Outboard leak

There should be a bolt/plug in that hole if not get oone and check oil. it's the oil over flow if you look at the bottom of the photo there is another hole and bolt you unscrew and fill from bottom with oil when it coomes out the top it's full. screw plugs in both top and bottom and your good to go. You fill the lower unit oil from the bottom.If there's no bolt/plug in there I wouldn't run it.


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post #3 of 10 (permalink) Old 10-07-2011, 05:34 PM
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Re: Outboard leak

Quote:
Originally Posted by 25-OTT6
There should be a bolt in that hole if not get oone and check oil. it's the oil over flow if you look at the bottom of the photo there is another hole and bolt you unscrew and fill from bottom with oil when it coomes out the top it's full. screw plugs in both top and bottom and your good to go.
Make sure you use lower unit oil in there. 25 is right. maybe you drained the lower unit to winterize and never put screw back in.

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post #4 of 10 (permalink) Old 10-07-2011, 05:38 PM Thread Starter
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Re: Outboard leak

According to my manual the overflow is to the right of the one you marked (its cut off and silver). That is the one i take out to change gear oil in lower unit.
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post #5 of 10 (permalink) Old 10-07-2011, 05:41 PM Thread Starter
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Re: Outboard leak

Can see it better in this photo. You still think it should have a screw in it? lol heck I've had the thing since 96 and never even noticed the hole the oil is coming out of before.

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post #6 of 10 (permalink) Old 10-07-2011, 07:56 PM
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Re: Outboard leak

Nope no screw. Mine does the samething. My Johnson will leak oil out of the same hole. It's a gray creamy looking oil right? I was told it was unburnt oil from the gas. Easy wayto se if really does need a screw is to check and see if it has threads in the hole.
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post #7 of 10 (permalink) Old 10-07-2011, 08:45 PM Thread Starter
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Re: Outboard leak

Grey, creamy and smells like 2 cycle oil. Never had it spill out before, until I saw it on the floor I never even knew there was a hole there.
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post #8 of 10 (permalink) Old 10-07-2011, 08:54 PM
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Re: Outboard leak

are you mixing heavy on the oil ?

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post #9 of 10 (permalink) Old 10-07-2011, 09:01 PM
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Re: Outboard leak

That hole is in the exhaust chamber side of the lower unit housing. If your leaking oil from there something must be preventing the oil to burn up as part of the exhaust gasses.
Check and see if your plugs are black oily, could be engine is running cold or improper 2 cycle oil mixture.

I also saw engines leak oil out of that hole where the drive shaft seal failed and was blowing oil out into the exhaust housing. Lower unit needs to be dropped to fix....at that point do yourself a favor and change the water pump out, that seal usually comes in the kit.
Good Luck

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post #10 of 10 (permalink) Old 10-08-2011, 02:07 PM Thread Starter
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Re: Outboard leak

I think I am running it rich and maybe a little heavy on oil. Thanks guys
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