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Disco Rear Rubber Coupling - Warning

Discussion in 'Land Rover Discovery' started by listerdiesel, Jul 30, 2009.

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  1. listerdiesel

    listerdiesel Well-Known Member Events Planner

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    This may have cropped up before, but just in case:

    There are rubber doughnut couplings for sale on ebay, which although looking identical to the LR part, and also made by GKN, are not correct for the Discovery.

    The items for sale are 5mm thicker than the genuine part and have a different part number moulded in the rubber.

    Anyone trying to use these will run the risk of the bolt thread being too short to properly engage the locking section of the nuts, which may lead to the nuts coming off, with possibly damage or even an accident.

    The new thicker one is 35mm thick and the part number is 249537. The old one is 30mm thick with a part number of 249782.

    There is a mechanical solution, and that is to fit M12 X 70 bolts instead of the original M12 X 65 bolts. They must be High tensile and preferably Zinc Plated. A new set of locking nuts would be a good idea as well.

    The thicker coupling will fit, and apart from a slight issue with the longer bolts and getting them in from the diff end, it all goes together OK. The propshaft has sufficient spare fore and aft movement to absorb the extra thickness, and probably 3/4" on top of that is available.

    I have fitted one today, and it performs as expected and cured a vibration that we had at about 65mph.

    Peter
     
  2. thebiglad

    thebiglad Well-Known Member

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    Hi Peter, thanks for the post and the heads up.

    Just a small point which might help someone in the future. Re the bolt fixings, if you fit the doughnut to the propshaft first you can have as much room as you need. When you fix the doughnut to the diff flange the bolts go in from the front, with the nuts on the back so no fitting problems.

    Hope I explained that clearly? The bolts that fix the doughnut to the propshaft go in from the back, the ones that fix the doughnut to the diff end go in from the front.
     
  3. listerdiesel

    listerdiesel Well-Known Member Events Planner

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    Yes, that's what I had, but I was assembling it all loosely before tightening anything up, to check clearances etc.

    I must admit I wasn't looking for the fastest time, but trying to identify any 'worst case' scenarios for the average user.

    With the doughnut on the propshaft there is a slight interference between the doughnut rear face and the prongs of the diff half of the coupling. The prop was pushed as far forward as it would go by hand pressure.

    It was my first coupling change as well :D

    Peter
     
  4. Dent

    Dent New Member

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    Best to bin the lot and fit a 200 prop and diff flange.
     
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