Dolomitejohn Posted July 1, 2019 Report Share Posted July 1, 2019 Hi all Couple of questions you may be able to help with. Spedo just stopped working. I guess cable or drive at g box end. Which is most likely? And vibrations from rear end. Guess uv joints. Easy to change? Thanks all. John Link to comment Share on other sites More sharing options...
johny Posted July 1, 2019 Report Share Posted July 1, 2019 you've got to start with the easiest checks first: disconnect cable at speedo and check its turning when the back wheels are driven. And if you get the rear of the car in the air check prop and half shaft u/js and prop sliding joint play. Then move onto the more difficult stuff..... Link to comment Share on other sites More sharing options...
Colin Lindsay Posted July 1, 2019 Report Share Posted July 1, 2019 9 minutes ago, Dolomitejohn said: Spedo just stopped working. I guess cable or drive at g box end. Which is most likely? Either end. It's most likely, unless it's broken completely, that the inner cable has slipped backwards out of the speedo. Which end can you personally gain easier access to? You can either get at it from the rear of the speedo, and pull the inner cable out slightly with pliers, or else go to the gearbox drive end and push the inner cable inwards so that it comes out of the other end and into the speedo. Have a look at the condition as heavily frayed wires mean a new cable. Clues as to the vibration? it could be anything from a wheel imbalance to a bent axle so try to explain how it sounds or feels. Link to comment Share on other sites More sharing options...
dougbgt6 Posted July 1, 2019 Report Share Posted July 1, 2019 Speedo: As Colin says, could be either end. Gearbox end is a tunnel off job, speedo end needs the triple jointed wrist. You can undo the speedo clamps and pull it forward enough to see down the back, so you can get your hand on it via the centre facia panel. I would favour the tunnel, tedious but less frustrating than the hand behind the dash. UV joints are fairly easy as are prop shaft UVs , but vibration could be anything. Doug Link to comment Share on other sites More sharing options...
Dolomitejohn Posted July 3, 2019 Author Report Share Posted July 3, 2019 Hi doug and all. Just removed Spedo cable from rear of speedo. Pulled the inner cable out and hey presto its snapped at gearbox end. Does the tunnel have to come out to access the cable at gearbox end or is it accessible from under the car? Cheers all. John Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 4, 2019 Report Share Posted July 4, 2019 (edited) Amd while youe at the geabox end please remove the angle drive make sure there is a 7/16" plain washer fitted to space the drive Away from the pinion drive housing. You are most unlikely to get cable off from underside unless you have double jointed 8" fingers with a torch on the end !!! While the tunnel is off good time to add big holes to access the gearbox filler and the speedo cable .to ease future jobs. if you feel,you need to lubricate the new cable its best to use graphite dust not overly available You can wet and dry a pencil , john will advise you can get grit in the flakes A light smear of grease not much the spriral wound cable can transfer it into the head If a cable has wrong inner protrusion you can with grips wind the spiral outer this will grow or shorten the outer quite easily Pete Edited July 4, 2019 by Pete Lewis Link to comment Share on other sites More sharing options...
Dolomitejohn Posted July 4, 2019 Author Report Share Posted July 4, 2019 Not sure I have an angled drive. It does not have overdrive (sadly). Does that make job possible from below? John Link to comment Share on other sites More sharing options...
Clive Posted July 4, 2019 Report Share Posted July 4, 2019 Sadly not. The chassis rails and gearbox mounting plate all get in the way. So limber up, H frame out and tunnel out. As Pete says, generous access holes are a good idea for the future. As is a good deal when refitting the tunnel. (Some like a thick circa 6mm? foam seal. In the past I have tried oiling the metal panels, and using silicone on the actual tunnel, hoping it would create a "perfect" seal that would not stick to the metal. Didn't quite work... ) Link to comment Share on other sites More sharing options...
Dolomitejohn Posted July 4, 2019 Author Report Share Posted July 4, 2019 Hi Clive. Thanks. I have only just fitted the tunnel and h frame along with new seal, reflective sound insulation and new dash parcel shelves and lower vents. Arghhhh Not sure I want to cut holes in my nice new plastic tunnel...... Oh well.... A nice job for the weekend... John Link to comment Share on other sites More sharing options...
johny Posted July 4, 2019 Report Share Posted July 4, 2019 I still think its easier to get to the speedo end (it certainly was on my Vitesse but maybe that has more room behind the dash) but if you are going to remove the tunnel again it will give a chance to have a look over the gearbox if you didnt do that recently. Theres checking all bolt tightenesses, gearbox rubber mount condition, oil level, gearlever linkage, bleed clutch etc Link to comment Share on other sites More sharing options...
dougbgt6 Posted July 4, 2019 Report Share Posted July 4, 2019 John, Here is a picture of my tunnel, I've put it on here several times before. I installed some recessed lighting in one of my ceilings (didn't like it much) and re-used the tool I bought from B & Q to drill the holes. I bought a giant grommet off fleabay and used black sealant to keep it in. THEN I checked the gearbox oil. No change in level since the last time I checked 5 years ago. Did I need to do it, I suppose so. I haven't done one for the speedo cable, the current one is 45 years old an still going. Doug Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 4, 2019 Report Share Posted July 4, 2019 On a local 13/60 cut hole in tunnel and ran cable inside under the carpet there was a reason which if i remember was to Get a std cable to fit on a overdrive conversion when ever when everywhere was shut Pete Link to comment Share on other sites More sharing options...
Buggy Posted October 25, 2019 Report Share Posted October 25, 2019 I also have a problem with the speedo on a GT6 Mk3,i removed the speedo but coudnt get the inner cable to move at all,so i removed the Tunnel,and speedo cable at other end same thing stuck solid,ordered new cable,however the angle drive off the gearbox is loose and sloopy at the end that fixes to the cable,if i remove the drive from the gearbox(is it a screw fitting??)that roughed up knurnled fixture,??it appears to have a grub screw in it,any ideas?? help Link to comment Share on other sites More sharing options...
Pete Lewis Posted October 25, 2019 Report Share Posted October 25, 2019 the knurled nut on the angle drive is just!! screwed onto the speedo output drive on the gearbox they do get gorrilla hands wreck them its a fine thread easy gets crossed on refitting the drive add a 7/16 washer between the angle and the gearbox to prevent pre loading and failing the angle drive ....common problem the washer is a BL tech fix pete Link to comment Share on other sites More sharing options...
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