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Old 06-25-2011, 08:13 PM
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Default 3.4 merc outboard
any one know anything about mercury 3.4 outboards pros and con please
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Old 06-25-2011, 08:28 PM
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I had one...getting hard to find parts for, and they are maintenance intensive..stay away if possible. Very heavy engine and very thirsty.
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Old 06-26-2011, 05:01 AM
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Just curious. What year was these engines, and what kind of power?
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Old 06-26-2011, 05:48 AM
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they were problematic from new....they dont like to be spun up past 5k RPM and parts no longer exist basically.....

is this part of a package or are you considering buying it to hang on something you already own?
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Old 06-26-2011, 09:03 AM
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Originally Posted by GEORGE YURICK
they were problematic from new....they dont like to be spun up past 5k RPM and parts no longer exist basically.....

is this part of a package or are you considering buying it to hang on something you already own?
hanging it on something the motor is new never fired still in crate
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Old 06-26-2011, 10:28 AM
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the good 1's had a cogsworth block.
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Old 06-26-2011, 03:01 PM
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mine was a Cosworth I think they were 1991 on or so..still had issues all the time...stay away!
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Old 06-26-2011, 04:34 PM
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Originally Posted by searaycer
mine was a Cosworth I think they were 1991 on or so..still had issues all the time...stay away!
Is this the 275 hp motors from 91-93ish with the 76 degree v6?
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Old 06-26-2011, 06:44 PM
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yep, Merc cast there own blocks from 1988 to 1990 or so then they were cast by Cosworth till 1993
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