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Mercury 70 HP Year

johnowen

New member
"I have recently purchased a b

"I have recently purchased a boat with a 70 HP Mercury, Ser No. OB373913. I am guessing a 90 or 91 year. Can someone identify?"
 
"I have a 1989 70 HP mercury O

"I have a 1989 70 HP mercury OB motor that I finally got running well. Now I am having a problem with the tilt going up & down. Does anyone out there know where the manual release would be, if there is one? The manual I have says there is one, but I can not locate it.
Thanks in advance."
 
I have a 1989 Mercury 70 HP and it died and wouldn't turn over. I knew what that meant but didn't want to believe it. Yes it seized..I tore into it to rebuild it and the number 3 cylinder has some grey color in it and is dry and the plug has the same. The other 2 cylinders are good. I know this is a common problem but what made it grey? Misfire? Not cooling properly? Contaminated fuel? As you see I been doing a lot of reading. Has anyone ever seen this? What can I do to prevent it happening again?
 
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