CrappieDays Posted June 17, 2009 Share Posted June 17, 2009 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. Quote Link to comment Share on other sites More sharing options...
Chris Haley Posted June 17, 2009 Share Posted June 17, 2009 They're 3/8" bolts,..... Torque is 35/ 40ft.lbs......7/16" bolts torque to 45/ 50ft.lbs..... Quote Link to comment Share on other sites More sharing options...
Chris Haley Posted June 17, 2009 Share Posted June 17, 2009 Google this and go to the mercury/mariner forum.exhaust manifold torque specs on 1989 40 hp mercury Quote Link to comment Share on other sites More sharing options...
boatfixer Posted June 17, 2009 Share Posted June 17, 2009 200 inch pounds. Start with the middle screws and work your way out criss crossing Quote Link to comment Share on other sites More sharing options...
CrappieDays Posted June 18, 2009 Author Share Posted June 18, 2009 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. Quote Link to comment Share on other sites More sharing options...
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