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Omc 5.8 efi new engine noise

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  • Omc 5.8 efi new engine noise

    Alright i hope i find the answer here. A 1993 Omc 5.8 efi with a new engine. The problem is that the engine sputter and clanks like crazy under load and the mechanic has no clue as to what it is. Before i shell the $$$ i am hoping to get some help ending this nightmare. The youtube link is attached. Also any OMC mechanic new North Miami, FL that can look into this issue?

    https://youtu.be/0Ig_0DRwHaA
    Last edited by Galvez83; February 10th, 2020, 09:36 PM.

  • #2
    Yeah, the rods are knocking and want out. Sucks since you say new engine... I see it's a 5.8L fuel injected, which also means it's entirely NLA.

    You can get another engine out of a 1990's Ford F series, change a few things and put your marine parts on and keep going. But be sure the boat is worth it.... Mercruiser swap would be a better idea, IF the boat is worth it
    1961 Custom Craft Sea Ray- 1964 Mercury 650. In family since new.

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    • #3
      Find a better mechanic if the one you have has no idea what to do.
      In Florida, I'd take the boat to rapidomarine and they will swap out the block for you for a good price.
      The one you have, sounds dead.

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      • #4
        Who installed the new engine?
        this mechanic or someone else?
        have you tried running it with the outdrive off (water supplied to thermostat housing) to see if the noises are coming from the engine or drive/gimble housing?
        A mechanic stethoscope will help find where the noise is coming from...
        1988 Four Winns 200 Horizon
        4.3 OMC Cobra

        98 Jeep Grand Cherokee 4.0 Selectrac
        07 Jeep Grand Cherokee Limited 5.7 Quadradrive II

        "While air doesn't freeze....rust never sleeps"

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        • #5
          I am in the process of replacing the fuel pressure regulator and high pressure fuel pump due to buzzing. Too late for Rapido Marine once the fuel issue is solved the company that i purchased it from said they would do a compression test and take it from there

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          • #6
            compression test has nothing to do with failed rod bearings. even with failed rod bearings the compression test will be normal.
            Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

            1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

            Past Boats
            1970 Wooster Hellion - Merc 9.8
            2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
            1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

            What’s behind you doesn’t matter.Enzo Ferrari

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            • #7
              It sounds like rod bearing until the rpms come up, then when the noise should get worst it starts going away. Post a vid of the motor just idling.

              Check the firing order 1-3-7-2-6-5-4-8

              Click image for larger version

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              94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
              95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
              07 Seadoo GTX
              Merc Adults Only VP Adults Only
              G-Dad always said "First Liar doesn't stand a chance"

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              • #8
                Here is a video oft 351 at idle disregard the bad or buzzing high pressure fuel pump. I did not notice rattling or other noise at idle.

                https://youtu.be/XFM24vsrWbo

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                • #9
                  I also have a video of the engine after assembly being tested at the stand and being revved and no noticeable noise.

                  https://youtu.be/2RiVb6XQ9rM

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                  • #10
                    It sounds good there. That wihne is kind of bad, and your saying its the fuel pump?
                    Hows the oil pressure?
                    94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                    95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                    07 Seadoo GTX
                    Merc Adults Only VP Adults Only
                    G-Dad always said "First Liar doesn't stand a chance"

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                    • #11
                      Is timing correct?
                      94 Formula 27PC Custom 509MPI MEFI3 , B3 XR
                      95 Rinker 232 w/ 7.4L Carb 0F425011 B1 0F486471
                      07 Seadoo GTX
                      Merc Adults Only VP Adults Only
                      G-Dad always said "First Liar doesn't stand a chance"

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                      • #12
                        Oil and timing are on the dot. Both where triple checked by the team but they seems to be scratching their head and it looks like the engine is coming back out.

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                        • #13
                          Originally posted by Galvez83 View Post
                          I also have a video of the engine after assembly being tested at the stand and being revved and no noticeable noise.

                          https://youtu.be/2RiVb6XQ9rM
                          do what I suggested before, remove outdrive, put water hose to thermostat housing and run engine. If no noise its in your gimble housing/gimble bearing or u joints.
                          1988 Four Winns 200 Horizon
                          4.3 OMC Cobra

                          98 Jeep Grand Cherokee 4.0 Selectrac
                          07 Jeep Grand Cherokee Limited 5.7 Quadradrive II

                          "While air doesn't freeze....rust never sleeps"

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                          • #14
                            Will do, its worth to see if this issue gets taken care, thanks

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                            • #15
                              Sign up today
                              The video in post 9 sounds normal but how long did you run it and during assembly and before it was run did you pre-oil the motor using the motors oil pump? Who assembled the motor were they experianced enough. Not unheard of to throw some rod bearings if something was missed on assembly. I had a motor come apart after only 22 hours.
                              Review the assembly work to see if any step was missed
                              NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

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