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PostPosted: 12 Sep 2016, 22:44 

Joined: 02 Apr 2013, 13:46
Posts: 262
Location: 52732
My 25 Merc has been starting to run really bad at idle. It is also blowing gas out of the side of the block. I was told that this is a common problem with the Merc split case design.

I am going to have to either repair this or get a new motor. Has anyone here done this and how was it? Dealer here want 5 hours min to fix it over winter. He says there is no gasket per say. but just a sealant.


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PostPosted: 12 Sep 2016, 22:49 
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Joined: 15 May 2010, 00:38
Posts: 2621
Location: Central Florida
Your dealer is correct in that there is no gasket. "Gel Seal" is used to seal the machined surfaces in place of a gasket.
Be prepared to pull the powerhead and remove the front half down to the crank. Flywheel and ignition will have to be removed as well.


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PostPosted: 18 Sep 2016, 22:55 

Joined: 24 Dec 2011, 22:06
Posts: 977
Location: 72032
5 hours sounds about right if a dealer's doing it. I remember doing a few of those Pieces of junk back in the day. Merc never admitted that there was a problem with them.


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PostPosted: 19 Sep 2016, 08:55 
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Joined: 15 Mar 2014, 16:57
Posts: 1917
Location: CT
What year models was this an issue on?



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PostPosted: 20 Sep 2016, 23:30 

Joined: 24 Dec 2011, 22:06
Posts: 977
Location: 72032
I stepped into the business in '92, and got out of Mercury in 1998 or 9. Don't know what years were affected. Mercosil was also a headache.


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