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Coolant in the Vee: suggestions please

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    Coolant in the Vee: suggestions please

    I have a coolant leak into the Vee. I can’t see where its coming from but coolant pools at the back of the engine near the bulkhead. I’ve had the inlet manifold and the water pump cover off and replaced the gaskets, with no improvement. It leaks immediately when I pressurise the cooling system, even before I start the engine. I’m assuming this isn’t a head gasket because I’ve not got any of the usual symptoms: no loss of power, steam from exhaust, water in oil, oil in water, or bubbles in coolant, and because its leaking without the engine running. So, what else can it be? There’s a core plug in the bottom of the inlet manifold, but I’m not sure if its into the water jacket. Could that be it, or are those core plugs in the top of the block under the manifold. Any suggestions please. I’m not sure what to try next. Thanks.

    #2
    I had a leak like Niagra Falls when I pressurised the cooling system on my project car, the core plug under the inlet manifold had corroded from the inside. It was a pain to replace it, but the engine runs as dry as a bone now. No leaks at all, not a drop. I never found a way to inspect this plug in situ, I'd love to know if anyone has a suggestion.

    Comment


      #3
      And just for info the core plugs in the block under the inlet manifold don't lead to water passages.

      If it is not leaking from the inlet manifold gaskets, then other places to look at are : thermostat housing, various hoses to and from the water pump, manifold core plug, and lastly - water pump seal.
      Header tanks - you can't beat a bit of bling.

      Comment


        #4
        A very common problem,i've changed the inlet manifold gaskets (payen),inlet core plug and waterpump gaskets...still leaks,i suspect my inlet manifold my need skimming but i'm investing in a boroscope to see whats going on first!!

        Comment


          #5
          Hello Ed,
          Have you had cause to disturb the thermostat? It’s very easy for the thermostat capsule to slip from its machined groove during reassembly unnoticed, for which the cover gasket cannot then seal. This then leaks backwards into the vee.
          Dave

          Comment


            #6
            Thanks guys. That’s really helpful. Away from home at the moment but when I’m back I’ll change the core plug. I’ve already changed all the hoses so I’m hoping that’s the answer.

            Comment


              #7
              Get a mirror or boroscope to see where it's coming from - could save you a lot of wasted effort. Look at the water pump vent - is it coming from that?
              What is the condition of head faces around the large coolant passages? Have the heads been aligned when they were fitted so that the inlet manifold fits and seals well?
              Chris

              Comment


                #8
                Back home now so have taken the manifold & water pump cover off (again). I have a new core plug for the manifold,- tomorrow's job, but now realise there are 2 core plugs on the inside face of each head at the front. Are these into the water jacket? Should I change them too. Re Wheelz last post; what/where is the water pump vent? Many thanks.

                Comment


                  #9
                  The water pump vent is the gap in the casting between the top of the Vee and the part that supports the water pump.
                  Only really visible with the inlet manifold off unless using an endoscope or mirror.
                  The water pump has 2 sealing areas - at the bottom into the oily bit and at the top into the watery bit.
                  The air gap helps keep the two fluids apart and the vent gets rid of any leaks from either.

                  Comment


                    #10
                    As Rigid says, under the inlet manifold. Any failure of the water pump seals results in a leak from the vent.
                    Chris

                    Comment


                      #11
                      So I don't know if the leak is from the water pump vent, but to be on the safe side, whilst everything is accessible, I wonder if I should change the seal (Rimmers Part No 148322, Impeller to bearing housing seal)?

                      Comment


                        #12
                        Well, the two O rings on the brass cage at the very least should be changed. Can't really say about the main impeller seal - if it wasn't leaking, I would leave it.
                        Header tanks - you can't beat a bit of bling.

                        Comment


                          #13
                          Yes change O-rings since you already have the pump out, but check the bore in the block for scratches or nicks that might cause O-rings to leak.
                          Chris

                          Comment


                            #14
                            Originally posted by Edmason View Post
                            So I don't know if the leak is from the water pump vent, but to be on the safe side, whilst everything is accessible, I wonder if I should change the seal (Rimmers Part No 148322, Impeller to bearing housing seal)?
                            See PM I sent. (X3)
                            Last edited by jbuckl; 13 June 2023, 00:37.
                            There are 2 secrets to staying on top :- 1. Don't give everything away.
                            2.

                            Comment


                              #15
                              Originally posted by Rigid View Post
                              The water pump vent is the gap in the casting between the top of the Vee and the part that supports the water pump.
                              Only really visible with the inlet manifold off unless using an endoscope or mirror.
                              The water pump has 2 sealing areas - at the bottom into the oily bit and at the top into the watery bit.
                              The air gap helps keep the two fluids apart and the vent gets rid of any leaks from either.
                              Liked…

                              Majority of engines include a vent & a weep passage.

                              Most engine water pump seals have to allow a tiny amount of weep to allow the seal to work.
                              During its normal life, the seal weeps such a small amount it’s never seen or noticed… that’s why there is a vent & weep passage.

                              Intention is that the weep evaporates before it’s visible.

                              Theres only a few exceptions to this… namely high speed off road engines, or specialist applications. E.G. liquid cooled 2 stroke dirt bikes…. When they leak it’s bad & visible. Lip seals only.

                              The stag is tricky to diagnose between pump & manifold gasket leaks…. Sometimes even hoses too!
                              Last edited by jbuckl; 13 June 2023, 00:56.
                              There are 2 secrets to staying on top :- 1. Don't give everything away.
                              2.

                              Comment

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