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Blown Head Gasket

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  • Blown Head Gasket

    1995 Regal 18ft Bowrider with 40 hour old Reco Chev 262 4.3lt V6 Mercruiser


    Well I just got a call from my mechanic today as my boat has been in the workshop for about 3 week because of water in the oil(which I thought was because I left the plug out)

    My mechanic tells me its a blown head gasket because the motor must have overheated.

    I ask the question how did the motor overheat? The Impellor is 40 hours old as is the motor and water pump. The mechanic verified that the impellor is fine and the water is pumping out well. I thought maybe a plastic bag or something, but the mechanic said the impellor would show signs of stress if this was the case.

    Can anyone tell me how the head gasket on a 40 hour old reconditioned motor would blow if the impellor is puming water? I dont mind paying to get the motor repaired but I need to know why it happened so it doesnt happen again.

    The motor is still under warranty, could this be a warranty issue?

    Need your thoughts!!
    sigpic
    1995 Regal 182 Bowrider
    Chev 262 4.3LT V6 Marine Motor
    with Alpha 1 Gen II


  • #2
    Re: Blown Head Gasket

    Howdy,


    Couple of things, what do you mean by "reconditioned"? Is the mechanic that has the boat now, the one that "reconditioned" it (and providing the "warranty"?)

    How does he know that the head gasket is "blown"? (I.E. did he do a compression check?)

    Where do you store the boat? (are you located in "cold" country?)

    Head gaskets don't usually "blow" ......... It does happen, but not very often. Usually, water in the oil of a marine engine is due to a crack in the cast iron (block, head, manifold(s) ) Not always.......but usually.


    If you didn't overheat the engine, it's unlikely that the head gasket is blown due to that. In fact, head gaskets don't usually "blow" on an open cooled marine engine that gets a little "hot". (there's no coolant pressure at all.)
    ----------------------------------------------------------------------------------
    I use xxx oil and have never had a problem........
    This post was created with OpenSuSE x64 Linux!

    Comment



    • #3
      Re: Blown Head Gasket

      Recondtioned motor was purchased by mechanic off a motor supplier and it consisted of Reco Chev 262 4.3lt V6 Mercruiser style unleaded long motor, comes with new exhausts and risers, new water pump, reco balancer, new alternator, new thermostat housing, new starter, reco carburettor, new intake manifold, new electronic distributor and leads, new flywheel, marine head gaskets, new flame arrestor Cost $6300 #A130. 12 months guarantee. Runs on unleaded fuel. (this is a heavy duty motor suitable for salt or fresh water)

      He has taken the heads off and found the blown head gasket.

      I am from australia, boating all year round here. Always stored on trailer at home under a car port.

      Lets say it did over heat without me noticing it, how did it happen with new waterpump and new impellor and impellor still pumping out water fine.

      I have to meet up with the mechanic tomorrow and I dont want him telling me bull sh*t.
      sigpic
      1995 Regal 182 Bowrider
      Chev 262 4.3LT V6 Marine Motor
      with Alpha 1 Gen II

      Comment



      • #4
        Re: Blown Head Gasket

        OK,


        Sounds like "reconditioned" there may mean, "rebuilt" here.

        It also appears that you probably do not have freeze damage.

        If a head gasket failed, that's what it is. Head gaskets do fail from time to time. It's very possible it was defective from the start or the head wasn't torqued properly (or not at all)..

        If the mechanic insists that an overheat caused the head gasket failure, you might ask him to show you the evidence.

        If your raw water impeller hasn't failed, there's no reduction in water flow, the manifolds/risers are not plugged (with rust), you didn't run the engine out of the water, and you never saw the temp gage indicate an overheat............ (does the engine have an overheat alarm?)

        I would say it's not all that likely the engine overheated.

        As an aside, did you replace the manifolds AND risers with new units and did the riser gasket(s) show evidence of leaking? (I.E. water in the exhaust and combustion chambers)


        You could still over heat an engine by having plugged manifolds/risers, the plumbing was connected wrong, or a plugged water line from the drive to the engine. You could also have impeller fragments from a previous impeller failure in the T-stat housing, or oil/power steering cooler (if installed) that would seriously reduce water flow. That would absolutely cause overheats.
        ----------------------------------------------------------------------------------
        I use xxx oil and have never had a problem........
        This post was created with OpenSuSE x64 Linux!

        Comment



        • #5
          Re: Blown Head Gasket

          The risers and manifolds are new with the motor, so they wouldnt be blocked and didnt hear any leaking.

          Unfortunately it does not have an alarm, boat in 1995 built, not sure if it ever came with one.

          No oil or power steering cooler installed as far as I know.

          He says he has the blown head gasket for me to see.

          As you can see my confusion, Im not sure whats going on!

          What questions should I ask him?

          By the way, thanks for your input, Im stressedto the max here
          sigpic
          1995 Regal 182 Bowrider
          Chev 262 4.3LT V6 Marine Motor
          with Alpha 1 Gen II

          Comment



          • #6
            Re: Blown Head Gasket

            If the impeller is intact, then the motor didn't overheat. If the headgasket is actually blown, it's because the head was improperly torqued by the "reconditioner".
            This is a warranty issue.

            Comment



            • #7
              Re: Blown Head Gasket

              Thats what im thinking TilliamWe. I smell a rat
              sigpic
              1995 Regal 182 Bowrider
              Chev 262 4.3LT V6 Marine Motor
              with Alpha 1 Gen II

              Comment



              • #8
                Re: Blown Head Gasket

                Originally posted by mark_fitzy View Post
                Thats what im thinking TilliamWe. I smell a rat
                Unfortunately, I think you will find one.

                Small Block Chevies handle overheats very well, as HT has been explaining. They don't normally blow head gaskets. They will crack heads in an overheat, but not usually blow gaskets. And they'll run with cracked heads, I know, I ran a SBC 5.7 for over 2 years after a 240F overheat. when I did take the heads off, for valve issues, one was cracked. Right in between two cylinders, but guess what? No headgasket damage!
                If the blown headgasket is his only evidence of an overheat, that's not evidence at all. There could be something wrong with the head or the block.
                Also, a blown headgasket shouldn't automatically equal water in the oil. There could still be something else wrong with that engine. Best of luck to you.

                Comment



                • #9
                  Re: Blown Head Gasket

                  It all sounds fishy, and I am not sure really how to go about catching this guy out? Is 3.43 am and I cant sleep,cant stop thinling about it!
                  sigpic
                  1995 Regal 182 Bowrider
                  Chev 262 4.3LT V6 Marine Motor
                  with Alpha 1 Gen II

                  Comment



                  • #10
                    Re: Blown Head Gasket

                    The risers and manifolds are new with the motor, so they wouldnt be blocked and didnt hear any leaking.
                    Hmm,

                    I donno how you might "hear" leaking. you might detect the results of the leaking though.

                    If you had a slight riser leak, some water would leak past a riser gasket back into the exhaust.

                    In any cylinder with an open exhaust valve you would have a little water run into the combustion chamber.

                    When you subsequently cranked the engine that little bit of water would cause a slight "hydrolock". That *could* cause a head gasket failure (due to the VERY high cyl pressures when the piston comes up against the water) but it doesn't always.......It usually just abruptly stops rotation while cranking.

                    It sounds like a weak or dead battery,but does it with a fresh or "jumped" (boosted) battery too.


                    If he "Mechanic" also installed the manifolds and risers, it's possible that he "screwed up" and either didn't install them correctly or they were defective. (or the manifold/riser casting surfaces weren't "square" and flat etc)
                    ----------------------------------------------------------------------------------
                    I use xxx oil and have never had a problem........
                    This post was created with OpenSuSE x64 Linux!

                    Comment



                    • #11
                      Re: Blown Head Gasket

                      As far as the risers and manifolds go, the whole engine was complete when he (the mechanic) purchased it, he (the mechanic) just installed the engine.

                      Anyway I am talking to the mechanic today, I will update you with the outcome.
                      sigpic
                      1995 Regal 182 Bowrider
                      Chev 262 4.3LT V6 Marine Motor
                      with Alpha 1 Gen II

                      Comment



                      • #12
                        Re: Blown Head Gasket

                        Just a quick note.
                        It's a V6, not a SBC.

                        "Reco Chev 262 4.3lt V6 Mercruiser style unleaded long motor, comes with new exhausts and risers, new water pump, etc etc..."

                        Comment



                        • #13
                          Re: Blown Head Gasket

                          Originally posted by triman View Post
                          Just a quick note.
                          It's a V6, not a SBC.

                          Same basic "rules" apply though!
                          ----------------------------------------------------------------------------------
                          I use xxx oil and have never had a problem........
                          This post was created with OpenSuSE x64 Linux!

                          Comment



                          • #14
                            Re: Blown Head Gasket

                            Originally posted by triman View Post
                            Just a quick note.
                            It's a V6, not a SBC.

                            "Reco Chev 262 4.3lt V6 Mercruiser style unleaded long motor, comes with new exhausts and risers, new water pump, etc etc..."
                            A 4.3 is the V6 version of the Small Block Chevy V8. As said above, same rules apply.

                            Comment



                            • #15
                              Re: Blown Head Gasket

                              One thing I suggest you have the mechanic check is the flatness of the heads and the block. Using a steel rule (and not the cheap one from the local home supply house) and a feeler guage, check the flatness of the heads and the block. Since this was a reconditioned engine, it is possible that the heads or block is not within specifications. This, to me, sounds like something which should be covered under warranty. Blowing a head gasket at 40 hours with no sign of water pump problems strongly suggests a problem with the rebuild. Hold your ground and demand the company which did the engine make good. Good luck. Hy

                              Comment


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