GT40 in 2001 SN

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  • dwsa
    • Sep 2005
    • 134


    #1

    GT40 in 2001 SN

    Hi, my TDC mark on the damper is a 1/8 inch groove and the graduated scale is about 90 degrees off. Is it possible to mount the damper in two positions, eg. does the damper have two slots that could locate with the crankshaft key. I have suspicions as I have a small vibration at 1500 rpm and the whole hull and deck shakes, so I was supecting the damper. My engine has just been rebuilt. Appreciate any ideas on the subject.
    Tags: None
    • CradGen2
      1,000 Post Club Member
      • Aug 2020
      • 1343

      • Horseheads NY

      • 1999 Ski 2000 Sport 2004 SV21 2007 216 1992 Malibu flightcraft 2008 210 2006 ski 2012 - 210 2016 BU 23lsv 1998 Sport 1997 Super Sport
      #2
      RE: GT40 in 2001 SN

      Do you have any photos. Not sure where you are talking about. If they pull the motor you could have an alignment issue.

        Comment

        • M3Fan
          1,000 Post Club Member
          • Jul 2003
          • 1034


          #3
          Re: GT40 in 2001 SN

          Originally posted by dwsa
          Hi, my TDC mark on the damper is a 1/8 inch groove and the graduated scale is about 90 degrees off. Is it possible to mount the damper in two positions, eg. does the damper have two slots that could locate with the crankshaft key. I have suspicions as I have a small vibration at 1500 rpm and the whole hull and deck shakes, so I was supecting the damper. My engine has just been rebuilt. Appreciate any ideas on the subject.
          Do you mean the harmonic balancer?
          ~~~~~~~~~~~~~~~~~~~~
          2000 Ski Nautique GT-40
          2016 SN 200 H5
          www.Fifteenoff.com

            Comment

            • dwsa
              • Sep 2005
              • 134


              #4
              RE: Re: GT40 in 2001 SN

              Hi, Yes I meant the harmonic balancer, the gradauted scale is not TDC. I have a slot that indicates TDC about 90 degtrees off set to the TDC slot, this corresponds to piston 1 at top and both valves closed. I am planning to pull the Harmonic balancer to see if it has two keyways slots.

                Comment

                • dwsa
                  • Sep 2005
                  • 134


                  #5
                  RE: Re: GT40 in 2001 SN

                  I checked alignment, looked OK to me. I really need to discoonect the prop flange and see if vibration stops, so far I have only run the engine with boat on trailer and in neutral, but I get this vibration.

                    Comment

                    • SGY
                      Senior Member of PLANETNAUTIQUE
                      • Jul 2003
                      • 990


                      #6
                      RE: Re: GT40 in 2001 SN

                      Does the vibe happen everytime or is it intermittent?

                        Comment

                        • CradGen2
                          1,000 Post Club Member
                          • Aug 2020
                          • 1343

                          • Horseheads NY

                          • 1999 Ski 2000 Sport 2004 SV21 2007 216 1992 Malibu flightcraft 2008 210 2006 ski 2012 - 210 2016 BU 23lsv 1998 Sport 1997 Super Sport
                          #7
                          RE: Re: GT40 in 2001 SN

                          You can also check the motor mounts. They can be sensitive.

                            Comment

                            • SGY
                              Senior Member of PLANETNAUTIQUE
                              • Jul 2003
                              • 990


                              #8
                              RE: Re: GT40 in 2001 SN

                              Crads, what would you check on the motor mounts besides them being loose?

                                Comment

                                • dwsa
                                  • Sep 2005
                                  • 134


                                  #9
                                  RE: Re: GT40 in 2001 SN

                                  Motor mounts are secure, what I notice most is that the FCC (fuel Filter) starts to shake and this resinates through the hull untill about 2000 rpm. I would just like someone to confirm that TDC is not on the graduated scale on the Hramonic balancer, but aligns with a single large slot on the Harmonic Balancer. Regards Greg.

                                    Comment

                                    • skijones
                                      • Mar 2005
                                      • 235

                                      • COLUMBUS OH

                                      • 1985 2001 1999 Snob
                                      #10
                                      RE: Re: GT40 in 2001 SN

                                      Check the harmonic balancer to see if the ring has moved. They are held to the inner hub by rubber and can move around when the rubber goes away.

                                        Comment

                                        • dwsa
                                          • Sep 2005
                                          • 134


                                          #11
                                          RE: Re: GT40 in 2001 SN

                                          Does not appear to have moved, besides if it had moved the slot would not line up at TDC. I would still like to cinfirm that the slot is TDC. Research on ford does show that they had two locations for TDC, some Harmonic Balancers (seen on Summit Racing website) have two graduation scales so can be used on either crankshaft.

                                            Comment

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