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Leaking BW 65 Autobox

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    Leaking BW 65 Autobox

    Hopefully a simple question.
    I use the correct procedure to fill the Autobox, get it hot, cycle thru all the gears then switch off and dip it immediately then top up to the 'Hot' level on the dipstick.
    Then overnight the level goes way above the max level on the stick and begins it leak out in various places because the level is so high in the autobox body. Left to leak like this the fluid reduces to a point where the transmission barks like a dog going around left hand corners because the pickup starts to pickup air.

    Various google sources say the Torque convertor is prevented from draining down by a 'check valve'. Is this check valve in the Torque Convertor or is it in the Valve body just above the sump plate? If in the valve body it would be reasonably easy to fix by dropping the Autobox sump. If in the TC then its a new TC and gearbox out.

    - Alan

    #2
    Think the level is checked and set with the engine running and hot oil on the c3 boxes

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      #3
      Valve body Alan - a friend tells me
      Paul - 3 projects, 1 breaker - garage built and housing 2 white Stags. One runs, one doesn't

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        #4
        Originally posted by Phil S View Post
        Think the level is checked and set with the engine running and hot oil on the c3 boxes
        c3?

        Paul - 3 projects, 1 breaker - garage built and housing 2 white Stags. One runs, one doesn't

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          #5
          C3 is the designation for the Borgue warner 3 speed boxes.
          Phil

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            #6
            Really? Never knew that I thought they were Ford gearbox designations
            Paul - 3 projects, 1 breaker - garage built and housing 2 white Stags. One runs, one doesn't

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              #7
              Just been through all this
              have a chat with this guy
              Andy +44 7941 361146
              really good service will rebuild your box if you are attached to it or send you one and relies on you returning rather than surcharging
              awesome

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                #8
                Even if the level raises overnight it should still not leak out, the transmission should be oil tight. It needs washing off with brake cleaner or similar then checking to see where the oil is from. Unless you have little or no drive foe 5-10 second when starting from cold you do NOT have a drainback issue.

                Possible leak sources are: selector shaft seals, breather O ring or hose not connected properly, kickdown cable or O ring. All these have been issues at one time or another when we used to see these all the time.

                As others have said the C3 was a Ford built unit that took over from the BW35 in Fords in the '70's, totally different in design to the BW units
                Last edited by Alacrity; 1 March 2019, 00:04.
                Auto transmission rebuilding since 1979 - for my sins!

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