Merc 90 - what year?

[Kristian]

I'm thinking of buying an old Mercury 90 V-6. The serial number is A150261.<br /><br />Can anyone tell me...<br /><br />1. What year is it (and how did you find out)?<br />2. What kind of reputation does this engine have?<br />3. Where do I get the best shop manual for this engine?<br /><br />Hoping someone can help me out - at least with the age.<br /><br />Sincerely, Kristian

 

[Trent]

Re: Merc 90 - what year?

Its a 1986

 

[johnkc]

Re: Merc 90 - what year?

KRISTIAN,this motor has to be an inline six ,the lowest h.p. v-6 is a 135. these engines are known for detonation ,mostly on #1, 3, 5, cyl. do a compression test before purchase ! order a merc manual from a merc dlr. if you do buy it, lower the wide open throttle timing by 2 degrees, this will help keep it from detonating. also get it pitched at 5500 rpm with normal load at w. o. t.

 

[Kristian]

Re: Merc 90 - what year?

Thanks, you two. It's a fantastic way to get help from people who really know.<br />I'm also a newbie, so I hope you don't mind me asking where you find out about this stuff. I mean, where did you look to find out how old this engine is and how do you know about this engines reputation for detonating?<br /><br />Sincerely Kristian kristiant@hotmail.com