Exaust manifold gasket blown again

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  • causewayskiier
    • Mar 2006
    • 101


    #1

    Exaust manifold gasket blown again

    I just found out that I had an blown exhaust manifold gasket over the weekend. The boat was missing at speeds around 15-20 mph and I could hear an exhaust noise louder than normal. The odd thing is I had a mechanic replaced that gasket last year and only put about 30 hours on the boat since. The boat is a 2007 with the 330 HP engine. Why would this gasket go out so soon? For that matter why did the first one go out with only 80-90 hours on the engine? Could the replacement gasket have been faulty or installed incorrectly. Does the gasket going out explain the engine miss?
    Tags: None
    • teamseal
      Senior Member of PLANETNAUTIQUE
      • Dec 2006
      • 384

      • Panama city, Florida.

      • 2009 196 ZR-6
      #2
      I have seen this on Indmar motors but have not seen it on a PCM. The Indmar motors that I replaced the gaskets on I used very high quality Header gaskets. Also make sure that their is no paint on the mating flange's as that can cause gasket blow out.

        Comment

        • DanielC
          1,000 Post Club Member
          • Nov 2005
          • 2669

          • West Linn OR

          • 1997 Ski Nautique
          #3
          When I winterize my boat and on any other boat I winterize, I check the exhaust manifold bolts for tightness. If I did not winterize the boat, and I am recommissioning it, I check the exhaust manifold bolts.
          If you had your manifold gaskets replaced, I would recommend you check the bolts for tightness after the first time the boat is used after the work, and if they are loose, keep checking them every time, until they stay tight. Find out what they should be torqued to, and tighten them to that spec, do not go tighter.
          It is very common for bolts to loosen up after service work. It used to be required that bolts be retightned after a few heat cycles, but that does not happen much anymore.

            Comment

            • causewayskiier
              • Mar 2006
              • 101


              #4
              exhaust manifold

              Thanks for the advice, does anyone know what torque the exhaust manifold bolts are supposed to be tightened to?

                Comment

                • richard
                  Senior Member of PLANETNAUTIQUE
                  • Feb 2005
                  • 406

                  • HK

                  #5
                  torque for manifold

                  it says 23-25 LB for Exhaust Manifold Bolts in PCM service manual

                    Comment

                    • jhersey29
                      • Nov 2013
                      • 330

                      • Colorado

                      • 1971 Correct Craft Mustang 1988 Ski Nautique 1992 Ski Nautique 1999 Ski Nautique
                      #6
                      Which side goes on out these gaskets. http://www.nautiqueparts.com/manifoldgasket.aspx Top and bottom is easy to tell but want to make sure I put the right side when I replaced them. I made them match what was done before not sure if that was correct. The shiny side was touching the manifold and the flat grey side was touching the block.

                      One side is shiny with a foil look and the other side is flat grey and looks like a normal gasket.

                      Thanks

                        Comment

                        • Nordicron
                          Senior Member of PLANETNAUTIQUE
                          • Sep 2009
                          • 557

                          • Madison, WI

                          #7
                          Yep torque those babies correctly! Should be checked after first hr and then again after 20hrs I believe.


                          Sent from my iPhone using Tapatalk

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