stinking water neck driving me crazy

Discussion in 'Small Block Mopar Engine' started by diymirage, May 17, 2018.

  1. diymirage

    diymirage HP@idle > hondaHP@redline FABO Gold Member

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    been trying to get the plow truck up to par and it is driving me crazy
    (next time i wanna buy a ford, just shoot me)

    i found out the reason i couldnt run a OEM coolant hose is because the PO installed the wrong water neck
    so, i ripped it of, bought a new OEM one (pot metal, whatever it is, definitely not the chrome guaranteed to leak one)

    so, first try, gasket, with a little permatex on both sides...small drip

    second try, no gasket, just a bead of permatex (the grey one made for waterpumps/thermostat housing and this time, its pouring out as quick as i can pour it in

    short of burning it, what should my third try be?


    (and i know, its not a mopar, but a water neck is a water neck, same principles apply, no?)
     
  2. fklskv

    fklskv Well-Known Member

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    I had a leak from my rear end cover. Chrome plated POS. I did it all. Ground chrome off, gasket, no gasket, gray, black silicone. Nothing worked.

    Finally get her stopped. Good old #2 Permatex and a gasket
     
    Last edited: May 17, 2018
  3. Mikes270dart

    Mikes270dart Well-Known Member

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    Dont know who makes it but seen "water neck" with a rubber O ring. Friend had one and it never leaked.
     
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    • SharpDart71

      SharpDart71 Well-Known Member

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      FLEX SEAL!!!! IT MAKES BOATS FLOAT AGAIN! ;)
       
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      • Bulldozer

        Bulldozer a.k.a. 73AbodEE

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        I have both the water neck and rear end cover in chrome, in fact I have two more chrome covers on my Dodge ram . none of them leak. I use the copper header gasket sealer. use lacquer thinner to clean surfaces first
         
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        • furrystump

          furrystump Well-Known Member

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          Leaking through the bolt threads because they go i to water passage? Just a guess.
           
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          • 4spdragtop

            4spdragtop FABO Gold Member FABO Gold Member

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            Let the goop dry before adding coolant maybe?
             
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            • toolmanmike

              toolmanmike FABO Staff Staff Member FABO Gold Member

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              Get out your straight edge and check both surfaces for straightness. Seal the bolt threads with liquid Teflon pipe thread sealant. I use gasket shellac (Indian Head) on the t-stat housing just to keep the gasket in place and no sealer between the gasket and intake.
               
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              • 69383valiant

                69383valiant Mopar because anybody can work on a chevy or ford. FABO Gold Member

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                On my 383 my thermostat housing was leaking.. filed it smooth new gasket silicone still leaked.. found the bolts were bottoming out added 2 washers problem solved...
                 
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                • 66jim

                  66jim Well-Known Member

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                  Use studs instead of bolts and seal the treads, use
                  the gasket with a little RTV on each side of the gasket
                  and let it dry 24 hrs before you add coolant.
                   
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                  • 12many

                    12many Well-Known Member

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                    Using the so called pos MP heavy chrome version, with gasket and thin film of silicone, yes it dribbled. Removed it, sanded it on a flat surface, checking it as I went, definitely an uneven finish when chromed.. Sanded till uniform, using a thin layer of silicone (no gasket) and no more leaking. It's a nice POS now:)
                     
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                    • TrailBeast

                      TrailBeast Slightly Twisted Member

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                      Some of you guys crack me up with the water neck fails and waiting for hours and hours for something to dry.

                      Sorry, but I just find it amusing.:D
                       
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                      • moper

                        moper FABO Gold Member FABO Gold Member

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                        Wood block with sand paper on it... Your water neck's best friend... Even new ones. Iron, aluminum, pot metal, stamped steel, chrome... They all benefit from being actually flat.
                        I agree - waiting hours to add fluid - that's just crazy to me...lol
                         
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                        • diymirage

                          diymirage HP@idle > hondaHP@redline FABO Gold Member

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                          We're talking ford here, that's the anchor, not the boat

                          I did not think they go into the Water, but both times I put some aviation permatex on the bolts, just to be sure

                          Did a minimum of 24 hours each time...as per instructions



                          Thanks for all the input guys, I will check for flatness and re assess the situation
                           
                        • j par

                          j par Well-hung Member

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                          20150920_165020.jpg
                          Maybe you can ask stroked340? It seems as he knows his way around this Permatex stuff and water leaks very well.
                           
                        • gliderider06

                          gliderider06 Well-Known Member

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                          I never wait to fill with coolant. Make sure everything is flat and smooth. I gorilla snot t-stat to housing as well as the gasget. Thats it. Make sure bolts are not bottoming out and use thread sealant on bolts. I refill as soon as all the hoses are connected.
                           
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                          • 69_340_GTS

                            69_340_GTS Well-Known Member

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                            O.K. you won't like this because it's "expensive". But I have one like this, and the thermostat housing is one place my engine will never leak again. Get one that uses an o-ring instead of gaskets, and is not cast. Billet Specialties Thermostat Housings 90820 (edit: This is for a SBM. I don't know what you are working on. I'm sure they make them for Fords too.)
                            bsp-90820_w_ml.jpg
                             
                            Last edited: May 17, 2018
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                            • furyus2

                              furyus2 FABO Gold Member FABO Gold Member

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                              Are we talking about a Ford small block? If so, make sure the thermostat gets seated properly before you tighten the housing. They are known for being hard to keep the thermostat in position.
                               
                            • diymirage

                              diymirage HP@idle > hondaHP@redline FABO Gold Member

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                              yes, 87 bronco with a 351 in it
                              i did some reading on ford sites as well and next time it goes together, i will run a rubber band through the thermostat, and loop it aroun pencil or something to keep it in place
                               
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                              • RPMagoo

                                RPMagoo Just An Old Motorhead

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                                -- Mancini Racing has one for $12.95 -- Sealed, fine, for Me.
                                 
                                Last edited: May 17, 2018
                              • justinp61

                                justinp61 Well-Known Member

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                                I have haven't had any trouble with leaking thermostat housings since the 70's. My Dad showed me how to flat file them, to check the surface on the intake and to not over tighten the bolts. I always use a gasket with a thin layer of copper silicon on both sides then just snug the bolts good. IIRC the bolts are 3/8" and a lot of people really get down on them and distort the housing.
                                 
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                                • j par

                                  j par Well-hung Member

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                                  I use Permatex's "Right Stuff" on everything and never have issues.
                                  I thought I'd at least get a polite "touche" for my first comment....
                                   
                                • diymirage

                                  diymirage HP@idle > hondaHP@redline FABO Gold Member

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                                  With or without gasket?

                                  And I let your first comment go unawsnered, since I figured I had that coming after your race announcement
                                   
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                                  • yellow rose

                                    yellow rose Doctor of Thinkology.

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                                    Oh shit....poking the bear.




                                    SNOWMOBILE
                                     
                                  • diymirage

                                    diymirage HP@idle > hondaHP@redline FABO Gold Member

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                                    Think I may have figured it out
                                    The gasket is a perfect match to the intake (edelbrock)

                                    The outlet for the bypass hose is too far from where it should be (you can tell by the gasket where the outlet is on the intake)

                                    I don't know if the Water neck I bought is off, or if the I take is, but I do know the neck I pulled of lined up perfectly

                                    20180517_162129.jpg