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CrappieDays

'89 40 hp merc outboard question

5 posts in this topic

I have a '89 40 hp mercury (4cyl) that is leaking water from the exhaust manifold cover. I ordered the new gaskets already but do not know the torque specs or tightening sequence for the bolts. I am not sure how important it is but if any one has this information I would sure appreciate it.

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They're 3/8" bolts,..... Torque is 35/ 40ft.lbs......

7/16" bolts torque to 45/ 50ft.lbs.....

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Google this and go to the mercury/mariner forum.

exhaust manifold torque specs on 1989 40 hp mercury

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200 inch pounds. Start with the middle screws and work your way out criss crossing

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Thanks for the help guys... Chris, I did see the forum you were talking about and I looked through it. I think that they were talking about a different motor though. Bruce..It sounds like you are right to me but I was wondering where you got those specs? I am not second guessing you but I have been told 5 different things by 5 different people and just want to be sure.

Thanks again.

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