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Mercuiser 5.7 LX

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  • Mercuiser 5.7 LX

    question the engine was hydrolocked due to exhaust failure now on start up you hear a compression his like a blown spark plug for a couple of cranks on start up . Engine runs fine . Just can’t figure where the noise is coming from .. any ideas?

  • #2
    The water could have tuliped a intake valve
    NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

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    • #3
      5.7lx engine I noticed a compressed air noise on start up can’t find leak . New plugs new manifold gaskets. Engine runs fine .no noise after initial start?

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      • #4
        Maybe the air around the choke. Hard to understand sounds without hearing them.
        83 Sunrunner 16.5 120 merc Alpha 1 drive SOLD 8/1/13

        1996 Crownline 202BR
        5.7l EFI 0f791070
        Bravo I drive

        GMC Yukon tow rig

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        • #5
          Was the noise there before the plugs and manifold gaskets? Has any other work been done lately?
          BOAT SPECS FORUM HELP STARCRAFT FORUM SHOP iboats
          Please, no PM's (Private Messages) regarding boat/engine problems.
          That is what the forums are for.
          Only forum/moderator issues will be answered in PM's.

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          • #6
            Need to give us more info on the type of engine
            NO PERSONAL QUESTIONS, THIS IS WHAT THE FORUM IS FOR.

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            • #7
              welcome aboard.

              Please at a minimum provide year, engine size, type of induction, etc. if you have it, also provide the serial number.
              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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              • #8
                Originally posted by GA_Boater View Post
                Was the noise there before the plugs and manifold gaskets? Has any other work been done lately?
                Answered my own question. Joey - Starting a new thread left out some key information.

                Both threads are now merged.
                BOAT SPECS FORUM HELP STARCRAFT FORUM SHOP iboats
                Please, no PM's (Private Messages) regarding boat/engine problems.
                That is what the forums are for.
                Only forum/moderator issues will be answered in PM's.

                Comment


                • #9
                  Sign up today
                  Well that info changes things. Compression check might turn up something. If nothing obvious there do a leakdown test.
                  83 Sunrunner 16.5 120 merc Alpha 1 drive SOLD 8/1/13

                  1996 Crownline 202BR
                  5.7l EFI 0f791070
                  Bravo I drive

                  GMC Yukon tow rig

                  Comment

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