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Ticking noise on 454 mag

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  • Ticking noise on 454 mag

    1989 Mercruiser 454 magnum (rectangular port heads)
    all stock, quadrajet carb, aluminum high-rise intake
    Pushes a 1989 baja sunsport 210 (21') with a 25p turbo prop

    Recently changed intake manifold gaskets due to small leak. Took it out to lake for first time and it ran flawlessly, intake leak definitely fixed and engine running great.

    Then about 5 hours into the day (probably 1.5 hours of run time on boat) while trying to pull tubers I got a loud clatter on takeoff. Idled home after that with a tick the whole way. It ticks at idle and gets worse as rpms go up. Here is a video so you can hear the ticking noise.
    http://www.youtube.com/watch?v=ffCCQn2uoRg

    Anyways, I also found that the #8 spark plug is black as can be (dry, carbon black, not oily). All other plugs on that side are a decent tan color (about what they should be at idle). FYI, the oil level is fine (not losing any, not low) and the engine temp is in normal operating range, nothing close to overheating all day (highest temp probably 170 degrees).


    Am I looking at trouble with a valve??


  • #2
    Re: Ticking noise on 454 mag

    sounds like rocker arm or lifter chatter from loose valves. pull valve covers and check valve lash would be the place to start
    sigpic

    Comment



    • #3
      Re: Ticking noise on 454 mag

      Originally posted by Josh P View Post
      sounds like rocker arm or lifter chatter from loose valves. pull valve covers and check valve lash would be the place to start
      that's what it sounds like to me as well.

      Comment



      • #4
        Re: Ticking noise on 454 mag

        I had a similar noise in my engine which turned out to be a valve that had been knocked off the pushrod. The root cause was water ingestion (water kept the valve from opening) from a bad exhaust.

        Originally posted by tcgravy View Post
        1989 Mercruiser 454 magnum (rectangular port heads)
        all stock, quadrajet carb, aluminum high-rise intake
        Pushes a 1989 baja sunsport 210 (21') with a 25p turbo prop

        Recently changed intake manifold gaskets due to small leak. Took it out to lake for first time and it ran flawlessly, intake leak definitely fixed and engine running great.

        Then about 5 hours into the day (probably 1.5 hours of run time on boat) while trying to pull tubers I got a loud clatter on takeoff. Idled home after that with a tick the whole way. It ticks at idle and gets worse as rpms go up. Here is a video so you can hear the ticking noise.
        http://www.youtube.com/watch?v=ffCCQn2uoRg

        Anyways, I also found that the #8 spark plug is black as can be (dry, carbon black, not oily). All other plugs on that side are a decent tan color (about what they should be at idle). FYI, the oil level is fine (not losing any, not low) and the engine temp is in normal operating range, nothing close to overheating all day (highest temp probably 170 degrees).


        Am I looking at trouble with a valve??

        Comment



        • #5
          Re: Ticking noise on 454 mag

          And from listening to your video, It's #5 or #7 rocker arms.

          Comment



          • #6
            Re: Ticking noise on 454 mag

            Nice sewing machine you got there . . . needs a valve adjustment . . . check to see if the lifter(s) on the port side are OK.
            Best regards,
            Formula 330 Sun Sport
            Twin Mercruiser 7.4 LX MPI (0F802036, 0F802039), Bravo 3's (0F806198, 0F806199)
            1969 Mercury 7.5 HP Outboard (26346XX)
            My F-330 Web Site: http://home.comcast.net/~tpenfield/F...30SS/Home.html
            My F-242 Web Site: http://home.comcast.net/~tpenfield/W...Boat_Page.html
            Member of the Month - February 2013
            http://www.iboats.com/blog/tpenfield...-of-the-month/

            Comment



            • #7
              Re: Ticking noise on 454 mag

              Pull the dipstick out about 1" and check the engine again. Trust me, do this now or you'll be really mad if you find out that's all it was after you've pulled the heads. If that's not it then pull the valve covers and start inspecting. If it's a lifter that's failed it'll be a little harder to find but it could just be that you dropped a piece of old gasket in the valley and it's stuck under the push rod so the lifter can't pump up. Don't even ask me how I know that can happen

              Comment



              • #8
                Re: Ticking noise on 454 mag

                How did you fix the hesitation backfire issue, i had the same problem, it was an overheated ignition coil, when puttin around for long periods of time would have that problem when trying to plane out. I always keep the bilge blower on now. Have not had any problems

                Comment



                • #9
                  Re: Ticking noise on 454 mag

                  What's the oil pressure, what weight oil are you running and how long since it's been changed?
                  '92 Chaparral 2550 SX Sport
                  454 BBC Mercruiser Bravo 1
                  Tow with '04 F150 Larriat SuperCab 4x4 5.4 Triton
                  US Coast Guard Aux.

                  Comment



                  • #10
                    Re: Ticking noise on 454 mag

                    With the engine warmed up check the oil pressure with a mechanical gauge.
                    If you can read this thank a teacher.If you can read it in english THANK A VETERAN

                    Comment



                    • #11
                      Re: Ticking noise on 454 mag

                      UPDATE FROM ORIGINAL POSTER: Finally getting back to this thread

                      Ended up getting the valve cover off and checking valve lash on all cylinders on the starboard side (#2, #4, #6, #8). Found 3 valves with loose rocker nuts (more than a few turns, lots and lots of play:
                      - cylinder #8 exhaust valve
                      - cylinder #4 exhaust valve
                      - cylinder #4 intake valve
                      I adjusted lash on here (going 1/2 turn past zero lash)...I have adjusted valve lash multiple times before and was using merc manual to guide me as well. With there being 3 loose valves, I also checked all other valves on that side. All others seemed to be just fine and within spec.

                      So, I thought I had this problem fixed, but did NOT. Went to start the boat...would not start after lots of cranking. Eventually fired but sounded terrible and then stalled. Then tried to start it one more time and now engine won't turn over. Also there is excess gas that appears to have overflowed out of the carburetor. I got nothin....obviously something went TERRIBLY WRONG HERE. Just hoping whatever I broke is still fixable.

                      PLEASE HELP / OFFER ADVICE

                      Comment



                      • #12
                        Re: Ticking noise on 454 mag

                        you may have had collapsed lifters and now the valves are hung open since you adjusted them. I would have adjusted them running, however that is me.
                        1988 Cruisers Rogue 2420 - VP AQ271C / 290DP "Rock'n Along"
                        http://forums.iboats.com/showthread.php?t=500145
                        1970 Wooster Hellion 7' of cool mini boat with a Merc 9.8
                        Recent Boats
                        2002 SeaRay 190BR - MC 5.0 / Alpha I series II "Cheasheads in Paradise"
                        1984 Avanti 170DLI - OMC 3.0 / OMC Stringer 400 "Ship Happens"

                        The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me

                        Comment



                        • #13
                          Re: Ticking noise on 454 mag

                          Originally posted by Scott Danforth View Post
                          you may have had collapsed lifters and now the valves are hung open since you adjusted them. I would have adjusted them running, however that is me.
                          Whats the best way to check for collapsed lifters? And how does that lend towards an engine that won't turn over? Please let me know.

                          As for adjusting valves while running, i would have but in order to take the valve cover off on a 454 mag you have to remove the exhaust manifold, and didnt really wanna run it w/ no exhaust manifold.

                          Comment



                          • #14
                            Re: Ticking noise on 454 mag

                            Originally posted by tcgravy View Post
                            UPDATE FROM ORIGINAL POSTER: Finally getting back to this thread

                            Ended up getting the valve cover off and checking valve lash on all cylinders on the starboard side (#2, #4, #6, #8). Found 3 valves with loose rocker nuts (more than a few turns, lots and lots of play:
                            - cylinder #8 exhaust valve
                            - cylinder #4 exhaust valve
                            - cylinder #4 intake valve
                            I adjusted lash on here (going 1/2 turn past zero lash)...I have adjusted valve lash multiple times before and was using merc manual to guide me as well. With there being 3 loose valves, I also checked all other valves on that side. All others seemed to be just fine and within spec.

                            So, I thought I had this problem fixed, but did NOT. Went to start the boat...would not start after lots of cranking. Eventually fired but sounded terrible and then stalled. Then tried to start it one more time and now engine won't turn over. Also there is excess gas that appears to have overflowed out of the carburetor. I got nothin....obviously something went TERRIBLY WRONG HERE. Just hoping whatever I broke is still fixable.

                            PLEASE HELP / OFFER ADVICE

                            OK YET ANOTHER UPDATE.....

                            Turns out the reason the engine won't turn over is because....its full of gas. Looks like my needle & seat in the carb isn't doing its job and gas is just going everywhere. Pulled all the spark plugs and engine turns over fine. So thats a separate problem to fix it would appear.

                            BUT.....

                            it does have me second guessing my valve/rocker nut adjustment though, not sure if I need to be investigating lifters or not? As always, any input is appreciated.

                            Comment



                            • #15
                              Re: Ticking noise on 454 mag

                              you have a few problems now.

                              first, fix the carb. if the carb was dumping that much fuel, it most likely thinned the oil severely when running.

                              next, change the oil - its now full of fuel

                              Third, you will need to back off each rocker and start from zero.
                              1988 Cruisers Rogue 2420 - VP AQ271C / 290DP "Rock'n Along"
                              http://forums.iboats.com/showthread.php?t=500145
                              1970 Wooster Hellion 7' of cool mini boat with a Merc 9.8
                              Recent Boats
                              2002 SeaRay 190BR - MC 5.0 / Alpha I series II "Cheasheads in Paradise"
                              1984 Avanti 170DLI - OMC 3.0 / OMC Stringer 400 "Ship Happens"

                              The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me

                              Comment

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