Pete Lewis Posted June 13, 2020 Report Share Posted June 13, 2020 and did it have a castle or nylock on the coupling nut Pete Link to comment Share on other sites More sharing options...
johny Posted June 13, 2020 Report Share Posted June 13, 2020 Strange as my 68 MK1 that I've had since '87 at 32000miles had a rubber one with a castle nut... Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 13, 2020 Report Share Posted June 13, 2020 a coupling castle nut has solid pinion bearing spacer just retorque , a nyloc has ( generally) a collapsible spacer and must be marked for position and retorqued to its original position or you can alter the pre load of the pinion bearings Pete Link to comment Share on other sites More sharing options...
RichardS Posted June 13, 2020 Author Report Share Posted June 13, 2020 4 hours ago, Nigel Clark said: +1 I would expect a late GT6 diff (probably any GT6 diff) would have a rubber lip seal. While you have access, as well as looking for the serial number, it would be interesting to check the final drive ratio and confirm it really is 3.89:1 as expected. Nigel I'm sure that it's a 3.89:1 as we checked it when we were trying to sort out the speedo problem. One turn of one wheel produces almost 2 turns of the prop shaft We've put in a rubber lip seal now but I knew that something strange was going on when I drilled a small hole in the metal outer face of the old seal and then tried to screw in a self-tapper to force the seal out. I could not screw in the self tapper more than a turn or two before it hit solid metal again. It should have been going into something soft. Rather then drilling deeper we decided to chisel the seal out as I wasn't sure what I would be drilling into. Richard Link to comment Share on other sites More sharing options...
RichardS Posted June 13, 2020 Author Report Share Posted June 13, 2020 2 hours ago, Pete Lewis said: a coupling castle nut has solid pinion bearing spacer just retorque , a nyloc has ( generally) a collapsible spacer and must be marked for position and retorqued to its original position or you can alter the pre load of the pinion bearings Pete Mine has a castellated nut so we torqued it up to the setting in the Haynes manual. 100 - 120 ft lbs if I remember correctly. It certainly felt that tight when we took it off. Richard Link to comment Share on other sites More sharing options...
johny Posted June 13, 2020 Report Share Posted June 13, 2020 I take it your car has overdrive fitted Richard as if not it probably wouldn't have a 3.89 ratio diff as standard? Link to comment Share on other sites More sharing options...
RichardS Posted June 14, 2020 Author Report Share Posted June 14, 2020 9 hours ago, johny said: I take it your car has overdrive fitted Richard as if not it probably wouldn't have a 3.89 ratio diff as standard? Yes, overdrive fitted. Richard Link to comment Share on other sites More sharing options...
RichardS Posted June 15, 2020 Author Report Share Posted June 15, 2020 Just to continue this rear brake saga ..... in the absence of any H-clips I decided to rig up a spacer on the end of the brake actuating arm to stop the brake shoe dropping off the edge of the piston. First I did the offside which seemed to be the most problematic but the spacer did the trick. I then went to do the nearside and was puzzled to find that the spacing was different, so I decided to take a few measurements and, guess what, the distance from the backplate to the middle of the piston was about 6 or 7 mm greater on the nearside cylinder than the offside cylinder. The nearside cylinder is clearly the correct part and the brake shoe rides nicely on the centre-line the piston whereas the offside is from something else and allows the shoe to drop off the piston. 😞 As luck would have it, the correct cylinder is the one which was completely seized and I had to abrade the corrosion from the piston to make it work whereas the incorrect cylinder functioned perfectly. Anyway, I've had enough of this so have ordered everything new apart from the drums themselves which are in very good condition. 🙂 Richard Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 15, 2020 Report Share Posted June 15, 2020 pleased you have found the culprit sounds like a bit of sods law has crept in crapped and about to creep out but youve spotted the differences without a doubt some owners fit some very off parts we found a wheel cyl where the previous owner had fitted the piston back to front in an attempt to expand an undersized seal fit the bore ....it leaked seriously but it had a mot. same day bodgers and spurious parts do not help us to have fun Pete Link to comment Share on other sites More sharing options...
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