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BW 65 leaking at sump gasket problem.

Discussion in 'Gearboxes and drivetrain' started by ButterFingers, Mar 17, 2017.

  1. DAV8

    DAV8 Member

    Hi Peter, Sorry to hear you have ended up with this situation but for me I wouldn't use the rubber gasket, it is very important to make sure the flange on the sump pan is flat! and I mean VERY flat!! I spent about 2 hours getting mine flat (a straight edge and feeler gauges so I could just about get a 1 thou (0.0001") gauge in) the critical point is where the bolt holes are as these tend to "dome" upwards, I got mine level using a 10mm bolt & nut with washers on the flange face and suitable size socket to fit on the underside of the flange, then tighten the bolt until the flange face is flat, it's not easy but worth the effort,
    I wouldn't use any type of sealer, and be very careful tightening the bolts, as others have said in this string (Colin and Jorg) hope this helps.
    Best Regards DAV8
    Dave.
     
  2. ButterFingers

    ButterFingers Member

    thank you Dave for the info:
    I posted yesterday some info , as follows, but it seems to have been lost, so here it is again.
    I bought some 15 x 3 mm flat bar and made and drilled the appropriate holes to suit the sump pan and attached them to the sump using the bolts to hold
    the reinforcements to the pan.
    hope that this makes sense.
    tightened up very carefully and hoped for the best.
    next morning there was the usual weeping at the gasket so the hours I spent on the reinforcement did not work.
    I now accept that old cars leak oils and will just place my oil drip pan under the car when stationary. check the oil level every week and top up as necessary...
    hosta la vista
    Peter
     
  3. DAV8

    DAV8 Member

    Hi Peter, I have heard about that method before but as I have said you really need to make sure the flange is VERY flat! have you used a cork gasket?, I would never trust the rubber ones, mine doesn't leak from the gasket (mine is a type 35) but, as you know the longer they stand the more likely they are to leak, I have drip tray under the gearbox and I reckon it leaks from the drive shaft at both ends, I always check the level before I go for a drive, just one of the joys of classic car motoring! wouldn't have it any other way! as I mentioned before, I added a tin of "Wynns" gearbox additive/stop leak without any ill effects, I am hoping Harvey will join in here with advice.
    Best Wishes DAV8
    Dave
     
  4. clive P62

    clive P62 Active Member

    Hi I've never had a problem with the cork gaskets.
    Most oil leaks ( mainly type 35s )
    are caused by overfilling/ seal on manual selection shaft and in rare cases through the inhibitor switch itself and drain of converter when left for some time which raises level.
    So if you think you can make our auto boxes completely leak free, you won't
    I've really tryed for years.:)
    Clive.
     
  5. ButterFingers

    ButterFingers Member

    hi there Dave, thank you for the info.
    I have just received a new CORK gasket from wins and the first thing I did was copy it using a much thicker cork gasket material that I happen to have in the shed.
    The wins one is so thin that I am not sure if it will seal all the undulations in my auto sump? :eek: the thicker one 3.2 mm will take up the valleys and ridges....:rolleyes: , now its a case
    of getting ones mind right to drain the box once again and install a new gasket.
    hoping for rain so I will be captive in the shed for the weekend.......
    peter
     
  6. DAV8

    DAV8 Member

    Hi Peter, That's a good idea making your own "thicker" gasket but you will still need to get the flange flat or you could very well end up with the same situation! as I said in a previous post, use a nut & bolt & washers (I think I used a 10mm or 3/8") place a suitable size socket on the underside of the flange so when you tighten the bolt it will just pull down the domed area of the flange face, I then ran a smooth file to ensure there were no sharp edges on the bolt holes ( observing absolute cleanliness at all times of course) but I cannot express enough the importance of getting the flange flat i.e. no valleys or ridges and yours being a type 65 should be better than a type 35. Good luck. DAV8
    Best Regards Dave
     
  7. clive P62

    clive P62 Active Member

    I get my auto gearbox parts from a company called vanmatic in Hayes Middlesex they do a thicker cork sump
    Gasket.
    Clive.
     
  8. harveyp6

    harveyp6 Well-Known Member

    They've been about for a long time.
     
  9. clive P62

    clive P62 Active Member

    They moved some years ago from Brentford to Hayes and used to rebuild lots of old FX4 taxis using the trusty type 35.
    They still offer gearbox rebuilds.
    Recently picked up my torque converter which they cut open / check clean and rebalance so I know all is good once ive rebuilt my NADAS box
    Clive.
     

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