R12 Speedo Cable Replacement ( again )
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Thread: R12 Speedo Cable Replacement ( again )

  1. #1
    Tadpole
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    Default R12 Speedo Cable Replacement ( again )

    Hi,

    The speedo cable in my R12 has failed. I have sourced a replacement cable Ė a Moprod MSD718 for an R1177. My instrument cluster is Jaeger. I have looked at the other threads on this topic which have been really helpful.

    Most of this task looks fairly straight forward. However - how do you get to the back of the speedo to unscrew and release the cable? Afraid I donít have a technical manual.

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    Has anyone done this and could let me know how to go about it?

    Thanks in advance,
    Michael

  2. #2
    Simon's Avatar
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    Stick your head under the dashboard, and you should see where the cable screws onto the rear of the speedo head. Undo the ridged nut securing the cable in place, it then just pulls out.

    Once undone there, follow the cable to the bulkhead, through the felt and rubber sheet (if original) and press through the grommet. At the gearbox, loosen the locknut securing the cable, but don’t unscrew the locknut all the way out, otherwise the whole speedo drive gear plastic housing will come out. It just needs to be loosened to release the end of the speedo cable. Note if the cable is poorly routed or kinked in its routing, if not just replace with the new cable though the same route. Just make sure there are lots of nice easy curves in the cable, and it isn’t rubbing on anything.

    Tighten the locknut onto the cable end where it goes into the gearbox casing, replace the grommet in the bulkhead, and replace the cable onto the back of the speedo head and tighten up the nut to secure it in place.

    The degree of difficulty is about 3, the hardest part is fiddling with the grommet in the bulkhead :-)
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  3. #3
    COL
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    Just like Simon says, the hardest part I find is getting the screw fitting undone on the back of the speedo depending on how heavy handed the previous person was.
    Regards Col

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  4. #4
    Tadpole
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    Thanks for the quick response.
    I have been under the dash and can see the ridged nut at the back of the speedo. Getting enough purchase on it to unscrew it is the tricky bit - not much room back there. Degree of difficulty only 3 - how big is the scale Simon!!
    Will have another go at it. Good to know the dashboard remains in place!

    Really appreciate the guidance....

    Michael

  5. #5
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    A small spanner or shifter should do it, it is only likely to need a tiny twist to get it going.

    It is a bonus the speedo is in the LH side of the cluster, instead of the middle........
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  6. #6
    1000+ Posts REN TIN TIN's Avatar
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    If you're really stuck you can undo the dashboard and move it forward a bit.
    There is a bracket on each side of the dash with slotted holes plus about 6 screws on top of the dash under the vent.
    You might need a cranked screwdriver to get some of the top screws.
    If it's an early 12 you might have to undo the heater tap and the heater vent controls but that depends on how far you want to move the dashboard. If it's just a bit you can get away without undoing the heater.
    The job is possible without undoing anything except the cable but it means lying on you back with your legs poking out the door.
    I did the cable on my 12 about a year ago (and several others over the years) and it's the VDO type with the speedo in the centre so is even more awkward.
    If you're stuck I'll check the workshop manual and scan the appropriate pages.

    Cheers
    Ren.
    "I cannot help but notice that there is no problem between us that cannot be solved by your departure."

  7. #7
    Tadpole
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    Moving the dashboard seems a last resort - but good to know it is a possible approach... will try from underneath in the first instance.
    Seems I need to approach it from the right hand side of the steering column - the left hand side is blocked by the parcel shelf bin...Think I can get a spanner to reach across to the nut.
    I note that the replacement cable I have has a plastic "clip on" arrangement to the back of the Speedo rather than the current ridged nut arrangement. No doubt all will be revealed....

    Great help everyone - thank you.

  8. #8
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    Um; before you start pulling things apart, post up a pic of the replacement cable, and the instrument cluster you have. It sounds like you have a cable for a much later (ie different model) Jaeger speedo.

    For the Jaeger equipped R1177 cluster (Australian 12TL/GL/LE with the speedo on the left, tacho in the middle and combi unit on the right), the cable is retained by a screw fitting rather than a clip fitting.

    Also the dash does not have to be moved a millimetre to replace the cable, there is actually plenty of space to include a Halda T-piece and cable in there as well without shifting anything. :-)
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  9. #9
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    Simon - the instrument cluster is standard R1177 - same set up as this cluster image.
    The replacement cable claims to be for R1177 as well. I will get a clearer image tomorrow but definitely a clip on end rather than a screw on arrangement.


    R12 Speedo Cable Replacement ( again )-r12cluster.jpgR12 Speedo Cable Replacement ( again )-s-l160x-4-.jpg

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    COL
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    Micheal the Jaeger instrument cluster you have shown takes the screw on type cable.

    The speedo cable that you have shown is for the later type instrument cluster out of what was know as the Renault Virage here in Australia like the pic below
    Attached Thumbnails Attached Thumbnails R12 Speedo Cable Replacement ( again )-083.jpg  
    Regards Col

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  11. #11
    1000+ Posts REN TIN TIN's Avatar
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    My recollection of the R12 speedo cables for the early (i.e. pre facelift and before 1.4 litre engine) was they had a screw-on cable. The Australian made VDO gauges had a larger knurled metal nut and the Jaeger had a smaller plastic nut.
    The clip-on were for the post-facelift/Virage versions.
    There were a large number of speedo cable variations for the Jaeger.


    Cheers
    Ren
    Attached Thumbnails Attached Thumbnails R12 Speedo Cable Replacement ( again )-pr1012-61.27.jpg  
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    1000+ Posts bowie's Avatar
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    Oh beautiful tachometer.

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  13. #13
    Tadpole
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    These are the detail shots of my MSD718 cable which claims to fit R12's from 1972 / 1978. The speedo head end looks like a clip on to me.
    I have owned a 1980 Virage in the past but never had to replace a cable.
    If this is the wrong unit - any ideas where I might be able to source the correct one? Perhaps Attspeed in St Marys could make one up?



    R12 Speedo Cable Replacement ( again )-r12cable.jpgR12 Speedo Cable Replacement ( again )-r12cablespeedoend.jpgR12 Speedo Cable Replacement ( again )-renault12speedocables.jpg

  14. #14
    1000+ Posts renault8&10's Avatar
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    Attspeed or the mob in Liverpool could make one up if you supply yours as a sample (and probably sacrifice the nut from old to new).
    I don't recall the name of the Liverpool business but they are specialist cable makers just off the hume highway (Rose St - I think!). Down near where the RTA used to be, but that probably doesn't help you!
    KB


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    Too many posts! JohnW's Avatar
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    "Flexdrive Agencies" comes to mind.
    JohnW

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  16. #16
    1000+ Posts renault8&10's Avatar
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    Looks like they've moved.
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    KB


  17. #17
    1000+ Posts REN TIN TIN's Avatar
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    The MSD718 cable in the photograph looks wrong. Maybe they had the box labelled incorrectly.
    It's hard to tell, but it also looks a bit short, maybe a LHD version. The RHD should be close to 1500mm long.

    If by 'failed' you mean the inner cable has broken (common problem) you should be able to get the inner cable replaced by a instrument repairer. I had the inner cable on my 12 replaced about 18 months ago (it was a VDO which you can't buy new) but of course you are in Sydney so the company here in Brisbane is of no use to you. They used the same outer but a replacement outer sheath is also possible. If one of the ends are broken then you'll need a complete cable which you'll have to buy from overseas.
    Universal cables are also available but you need to be able to transfer and crimp the ends onto the replacement which is probably beyond most of us.

    As a last resort you could try a used replacement.

    BTW you can use a GPS monitor as a speedo temporarily.
    Not sure how accurate they are but should be close (and you don't have a odometer).


    Cheers
    Ren.
    "I cannot help but notice that there is no problem between us that cannot be solved by your departure."

  18. #18
    Tadpole
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    Thanks again for all the great help.

    It does seem the supplied cable might be incorrect. Strangely I have seen this model cable advertised before and again it included a clip on end rather than a screw on fitting.

    Will speak to the aftermarket cable organisations and see what is possible in terms of making up a replacement.

    Of course - if anyone has a spare sitting on a dusty shelf somewhere not doing much please let me know!

  19. #19
    1000+ Posts REN TIN TIN's Avatar
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    I'd have a used cable somewhere (and if memory serves, might even have a NOS one somewhere in the shed) but a used 40 odd year old cable might last 10 minutes or 10 years.
    Getting a new cable or new inner cable for the one you've got is the best option.
    At least you won't have to worry about it again in your lifetime (I'm assuming the 12 doesn't do high mileages any more).

    Cheers
    "I cannot help but notice that there is no problem between us that cannot be solved by your departure."

  20. #20
    1000+ Posts REN TIN TIN's Avatar
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    Hello Michael,

    This is the cable I have, it's labelled # 7701348393.
    This part number isn't in my parts book (someone wrote this number in my book by hand) but the cable could have been updated in a later version of the book. Hand written on the cable packet is that it's for the late R12 R1170, R1177, R1330 (wagon) and also the part number 7700568263 and that it's 1647mm long. It would appear to be a bit long but too long is way better then being too short.
    It has the small knurled nut on the Speedo end which should be correct for the Jaeger speedo if memory serves.


    R12 Speedo Cable Replacement ( again )-img_0098%5B1%5D.jpgR12 Speedo Cable Replacement ( again )-img_0099%5B1%5D.jpg

    Cheers
    Ren
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  21. #21
    1000+ Posts REN TIN TIN's Avatar
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    The clip-on cable that you received from OS would appear to be for a Virage.
    This is the speedo fitting from a Virage instrument cluster I have.


    R12 Speedo Cable Replacement ( again )-img_0101%5B1%5D.jpg
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  22. #22
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    Thanks Ren....

    Perhaps this is all a message from the Renault gods to just go out and get a Virage - with a broken speedo... ( At least I have a cable for it now! ) Just need to think of a better excuse!

  23. #23
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    I had speedo problems with my old Range Rover, speedo would just stop, usually when I was 1000 or more kms from home. Totally replaced everything including the head twice. Then I was leaving Sydney to go home to Coffs at around 1PM when the thing died again. I had to get home, so I bought a GPS. Great solution. Funny thing was, near Raymond Terrace, the speedo sprang to life again. Turns out that speedo read incorrectly, showing 100KMH when vehicle was actually doing 110.

  24. #24
    1000+ Posts bowie's Avatar
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    accidentally good then.

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  25. #25
    1000+ Posts REN TIN TIN's Avatar
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    Doesn't take a whole lot to stop a mechanical speedo from working correctly.
    Wear at either end, corrosion in the gauge, a kink in the cable, even putting the inner cable in the wrong way.
    An intermittent speedo is often caused by wear in the worm drive in the gearbox.
    The worm gear is often made of nylon or some other hard plastic and they do wear out.
    Some of the time the worm gear might just be making enough contact for the speedo to work but go over a bump, engine vibration, or the oil level drops, etc. and it ceases to work.
    Replacing the cable won't make any difference because the worn component is in the box. and the only fix is to replace the speedo drive gear.
    But knowing this wouldn't have helped a whole lot when you're 1000km from home.


    Cheers
    Ren
    "I cannot help but notice that there is no problem between us that cannot be solved by your departure."

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