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  • blackstang932005
    PWCToday Regular
    • Aug 2012
    • 146

    blown head gasket?

    1996 daytona 770.I was flying down the river when all the sudden the jet ski quit pumping water. I was stupid and the motor got hot. I cleaned about 2 pounds of sand out of the screen the next day. I took it back out and know it pumps water fine put acts like its running on one cylinder. It will only go about 20mph and acts sluggish. i did a compression test. 135 on one cylinder and 95 on the other. any help would be appreciated.
    Last edited by blackstang932005; 08-05-2012, 06:41 PM.
  • alexb757
    PWCToday Regular
    • Jun 2011
    • 64

    #2
    Re: blown head gasket?

    You have to take the head off to investigate that "95" reading.

    Comment

    • blackstang932005
      PWCToday Regular
      • Aug 2012
      • 146

      #3
      Re: blown head gasket?

      Click image for larger version

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ID:	4273669

      Comment

      • blackstang932005
        PWCToday Regular
        • Aug 2012
        • 146

        #4
        Re: blown head gasket?

        Click image for larger version

Name:	2012-08-06 15.17.15.jpg
Views:	1
Size:	244.0 KB
ID:	4273670

        Comment

        • blackstang932005
          PWCToday Regular
          • Aug 2012
          • 146

          #5
          Re: blown head gasket?

          what you guys think? obviously that gasket is warped and a small crack. is this whats causing the problem?

          Comment

          • alexb757
            PWCToday Regular
            • Jun 2011
            • 64

            #6
            Re: blown head gasket?

            Replace the gasket with a new one and try another compression test. You might have found your problem.

            I'd also keep an eye on those pistons. There's not a lot of wash on the tops indicating a lean mixture. Could be from getting too hot from lack of water, or something else.

            Comment

            • blackstang932005
              PWCToday Regular
              • Aug 2012
              • 146

              #7
              Re: blown head gasket?

              Originally posted by alexb757 View Post
              Replace the gasket with a new one and try another compression test. You might have found your problem.

              I'd also keep an eye on those pistons. There's not a lot of wash on the tops indicating a lean mixture. Could be from getting too hot from lack of water, or something else.
              thanks for the reply. my ski has always ran rich. so your correct about it not running lean. I hope this is the problem! Im not sure if this makes sense, but the 135 compression was on the piston without the little tear in the gasket.the 95 compression was on the good looking side of the gasket.

              Comment

              • Swiss
                Top Dog
                • Jun 2010
                • 1857

                #8
                Re: blown head gasket?

                looks like this......


                PWC Sales/Service/Performance Grand Lake,OK
                922 N.3rd St. Langley,OK 74350 918-902-7876

                Comment

                • blackstang932005
                  PWCToday Regular
                  • Aug 2012
                  • 146

                  #9
                  Re: blown head gasket?

                  Im putting the head gasket on today. Damn i hope that this is the problem

                  Comment

                  • blackstang932005
                    PWCToday Regular
                    • Aug 2012
                    • 146

                    #10
                    Re: blown head gasket?

                    well, that didnt work.F! it is still doing same thing. the motor sounds good. It just pushes threw the water at 4.5 rpms and about 20mph. I met a guy at the boat ramp and he believed it was the wear ring is bad. I did clean about 2 pounds of sand out of it after it broke down. any ideas?

                    Comment

                    • alexb757
                      PWCToday Regular
                      • Jun 2011
                      • 64

                      #11
                      Re: blown head gasket?

                      New compression numbers?

                      Comment

                      • blackstang932005
                        PWCToday Regular
                        • Aug 2012
                        • 146

                        #12
                        Re: blown head gasket?

                        no compression numbers. i rented a piece of crap compression tester that basically fell apart in my hand. mechanic at work thought the pistons and sleeves looked fine.

                        Comment

                        • blackstang932005
                          PWCToday Regular
                          • Aug 2012
                          • 146

                          #13
                          Re: blown head gasket?

                          i started to take apart the intake and pump. man them screws are stripped on the bottom of the intake. I dont think this is going to be easy.

                          Comment

                          • blackstang932005
                            PWCToday Regular
                            • Aug 2012
                            • 146

                            #14
                            Re: blown head gasket?

                            plus my battery was dead.

                            Comment

                            • blackstang932005
                              PWCToday Regular
                              • Aug 2012
                              • 146

                              #15
                              Re: blown head gasket?

                              Also... The water just seems to trickle out instead of shoot out.

                              Comment

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