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Hot!gearbox speedo drive

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BigAl
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2010/07/11 21:39:25 (permalink)
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gearbox speedo drive

Can anyone tell how to change the gearbox speedo drive cog? I have a 1600 gearbox and a 2 litre diff and I want to change it so that the speedo reads the correct speed. It's annoying with the speedo wrong.
Cheers, Big Al
#1


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    tb303
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    RE: gearbox speedo drive 2010/07/11 22:12:36 (permalink)
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    Hi BigAl,on the other side of the speedo drive on the extension housing you will see a plug much like a welsh plug it will have a little raised lip on it,just leaver it out with a flat head screw driver and you can simply just pull the speedo drive out,easy peazy.

    Regards Troy
    #2
    BigAl
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    RE: gearbox speedo drive 2010/08/11 21:33:50 (permalink)
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    Thanks for that Troy, but I tried that and all I did was bend the crap out of the lip. Couldn't even get it out with multigrips.
    Maybe I should persevere with it, it must come out.

    Cheers, Big Al
    #3

    blackvr
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    RE: gearbox speedo drive 2010/09/11 17:17:24 (permalink)
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    Keep trying... it will come out. Then panel beat the lip back into shape. They use pretty good glue back in the factory !
    #4
    Norris
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    RE: gearbox speedo drive 2010/09/11 20:48:57 (permalink)
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    try using a small screw driver and gently both sides and it will come out repair the damage a little bit of sealer so it dosent leak
    #5
    willy pete
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    RE: gearbox speedo drive 2010/12/11 15:51:54 (permalink)
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    The workshop manual states to use a new cover & use sealant around it before tapping it back in - it's likely it has a grade of Loctite or similar holding it in & sealing it - so be careful and patient taking it out! Not sure where you would find a new cover nowadays... Cheers

    edit: New covers are available from Burtons in the UK - I was chasing speedo drive gears myself and happened on it by chance...
    #6
    premacist
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    RE: gearbox speedo drive 2010/11/16 14:41:07 (permalink)
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    If its a escort gearbox you will have to use a puller and pull the speedo drive coge of the tail shalft ---- which means taking the gearbox out taking the tail house off---- allmose means pulling the gear gox apart ----(its a pain in the a ) ---- if you have a old tail shalft houseing cut the peace off that bolts onto the gearbox but that is a mission as there is a narsty cer clip to contend with-- i dont know howw meny cogs there are ---i have seen 3 off them-------------------------------------------------

    Thanks for that Troy, but I tried that and all I did was bend the crap out of the lip. Couldn't even get it out with multigrips.
    Maybe I should persevere with it, it must come out---------------- sadly i dont think that will help ---- but if it dose use come heat and tap the other end ---wher the speedo fits after taking out the small C clip may be use a socket the size or a tube --- work out some way of hitting it with out damageing the any thing heat that cap remember it plastic dont melt it
    k out some way of
    #7
    wombat2509
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    RE: gearbox speedo drive 2010/11/16 17:41:51 (permalink)
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    Didn't the Capri Clinic do boxes to calibrate speedo's,they used your cable & fitted a drive into it to get the correct reading ?
    #8
    willy pete
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    RE: gearbox speedo drive 2010/11/20 16:03:17 (permalink)
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    I've been playing with speedo drive gears, worms & pinions for the last week, trying to find what I need for my Mk2, so here's the heads up - the following can be done with the box in the car if necessary.

    Tap gently on the end of the speedo gear shaft with a nylon hammer or something soft, and that metal cup will pop out without damaging anything. If you've damaged it, Burtons in the UK sell new ones as well as the speedo pinion gears.

    Next, use a screwdriver to push the speedo pinion gear right out.The next step is to check the number of teeth on the worm gear that is pressed onto the output shaft - you can see it down inside the hole where the speedo pinion was - using a rag, wipe the oil off the start of one of the teeth and mark it with a texta or paint marker pen. Rotate the output shaft by hand with the gearlever in neutral, and count the teeth on the worm - yes, you can see down the hole but it is much easier with the box out of the car. You should have either a 6 tooth or 7 tooth worm gear - 7 is the most common by far, although I've recently heard of 8T but never seen one. If it's 7T chances are that you won't have to change it.

    Wipe the end of the plastic speedo pinion gear that you pulled out earlier, the end opposite the cable, down inside the groove and you should see some Part Numbers and the number of teeth - ie 24T

    The combinations are as follows from the factory:

    3.54 Diff - 7T Worm - 23T Pinion
    3.77 Diff - 7T Worm - 24T Pinion
    3.77 Diff - 7T Worm - 25T Pinion (different tyre size - parts book not clear)
    3.89 Diff - 7T Worm - 25T Pinion
    4.125 Diff - 6T Worm - 23T Pinion

    The most abundant seem to be the 7T - 24T combos as used in 3.77 Diff 1600 Sedans, so the odds are stacked in your favor that you likely won't have to pull the whole box apart to change that worm gear.

    If your diff is original it should be 3.54 for a 2.0 Litre according to the Factory workshop manual.

    Cheers
    #9
    premacist
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    RE: gearbox speedo drive 2010/11/25 14:59:22 (permalink)
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    that metal cup will pop out without damaging anything. If you've damaged it

    cortina gear boxes have yhe same set up i think better have a look see be for you pull one out
    #10
    griezy
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    RE: gearbox speedo drive 2019/02/07 19:40:41 (permalink)
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    can someone tell me what the cap is called ive been trying to find it on burtons site
     
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