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Pressure test block/HX Volvo Penta 5.7Gi

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  • Pressure test block/HX Volvo Penta 5.7Gi

    So I need to pressure test my VP 5.7Gi block for leaks. Suspect a blown head gasket do to water in oil but engine runs fine. From last post, salt water pouring out (and I mean pouring!) of RW reservoir. Engine now overheats. Pulled HX to pressure test but not much on web hot to do procedure. Read about bike tire but how do I plug up other outlets/inlets? My main question is: I may have two problems, bad HX and blown head gasket. How to I do a block test with heat exchanger removed? Pic of engine below. Thank you for help. Eric Mailander

  • #2
    Make sure to look at the exhaust manifolds and risers probable that's were the problem started as for pressure testing the block I haven't heard of doing it that way .
    , the way I've always seen it done was to introduce air into the spark plug holes one at a time and see or here where the air come out
    The trouble with trouble is it starts as fun!

    Comment


    • #3
      Get HX tested. If that passes, re-install, block off inlet hose and two hoses to exhaust and use a standard radiator pressure tester (about $20 on amazon)
      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

      Comment


      • #4
        Thank you for the help. I ended up placing a cut bike tire tube over the fresh water side of the HX and blocked the overflow tubes. Then emerged the unit in a water-filled ice chest and air bubbles came out two of the raw water ports. So guess it failed the test. The HX is now obsolete and terribly expensive if I could even find one. May have to just re-power. Thank you again guys.

        Comment


        • #5
          as I told you in your other thread. take your HX in to a radiator shop and have them test. they can also repair.

          and yes, a proper HX is about $800 just for the cooler, a complete kit is about $1500
          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

          Comment


          • #6
            Thank you. My HX is sealed and I think the leak is inaccessible. I did an online search for the same type of HX and it is now obsolete. Anyway, I appreciate your comments!

            Eric

            Comment


            • #7
              Bullcrap

              Take it to a radiator shop. Quit arguing and just do it

              The end caps get un-soldered, the tube sheets re-brazed. Then the end caps re-soldered

              Its done all the time.

              So quit arguing, look up you local heavy duty radiator shop and get it repaired.

              You already wasted 3 weeks
              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

              Comment


              • #8
                Thank you. I get advice from so many people, many telling me to just re-power at 4,000 hours. If the HX rebuild fails or a radiator shop can't salvage it, can I just convert back to raw water? Just a thought.

                Comment


                • #9
                  at 4000 hours your motor is most likely tired. HX's can always be repaired.
                  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

                  Comment


                  • #10
                    Sign up today
                    Roger. Just know I do really appreciate your advice. Thank you once again, I'm learning a lot!

                    Best, Eric

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