earckens Posted August 19, 2021 Report Share Posted August 19, 2021 When on the road my TR4 speedometer "wobbles" with a 20kph margin, ie when driving presumably 60kph, it wobbles between 50 and 70. I checked the cable connecting between the engine and the speedometer: good fit, no worn ends on either side (nice squared ands), sufficiently but sparingly greased. What would I have to do to get this meter to read steadily? Quote Link to post Share on other sites
keith1948 Posted August 19, 2021 Report Share Posted August 19, 2021 Mine did that for a time. Might be caused by the cable being bent slightly. It should follow a route that means there are no sharp bends and should go through the hole in the bulkhead nearest the back of the speedo. Also pull the inner cable out and give it a good clean. I use a bit of thin oil for lubrication - just enough to thinly coat the cable (use an oily rag). Grease can go hard and then the inner cable can bind slightly especially if the cable isn't routed smoothly. If any grease has got into the speedo in the past then it can get onto the spinning disc inside and cause erratic readings. In my experience the fault was with the cable not the speedo itself. Keith Quote Link to post Share on other sites
bob-menhennett Posted August 19, 2021 Report Share Posted August 19, 2021 Keep any lubrication away from the top section of the cable behind the Speedo.15 /20cm ought to be enough. Bob Quote Link to post Share on other sites
james christie Posted August 19, 2021 Report Share Posted August 19, 2021 I have the same problem on my3A. My plan, when I find the motivation, is to seriously clean the cable of past lubricants and use graphite powder up to 20cm befor3 the speedometer. james Quote Link to post Share on other sites
Deggers Posted August 19, 2021 Report Share Posted August 19, 2021 +1 James. The needle on my 3A used to leap over the numbers like an auctioneer at a cattle market. Thoroughly clean, then coat with graphite powder. Deggers Quote Link to post Share on other sites
Charlie D Posted August 20, 2021 Report Share Posted August 20, 2021 11 hours ago, Deggers said: Thoroughly clean, then coat with graphite powder. +1 There are many instances where graphite powder should be used instead of oil. For example I was always told to never oil door locks (of any sort), use graphite powder instead. Charlie. Quote Link to post Share on other sites
Drewmotty Posted August 20, 2021 Report Share Posted August 20, 2021 Try driving the speedo directly with an electric drill. If it still fluctuates then a repair/rebuild will be needed. Quote Link to post Share on other sites
RobH Posted August 20, 2021 Report Share Posted August 20, 2021 21 minutes ago, Drewmotty said: Try driving the speedo directly with an electric drill. But make sure it is running anti-clockwise ! Quote Link to post Share on other sites
earckens Posted August 20, 2021 Author Report Share Posted August 20, 2021 2 hours ago, RobH said: But make sure it is running anti-clockwise ! Top!! I wouldn't have thought of that. Quote Link to post Share on other sites
earckens Posted August 20, 2021 Author Report Share Posted August 20, 2021 (edited) I removed the cable, cleaned all residual grease (not much), restored and did the drill test. I held the drill my wife read the meter, went up to 25 and stable. A road test will not be soon as I am still busy with front suspension overhaul and waiting for parts (oillite bushings, the last one refused to go in and bust, no spares). Edited August 20, 2021 by earckens Quote Link to post Share on other sites
james christie Posted August 20, 2021 Report Share Posted August 20, 2021 Wonderful people wives….. james Quote Link to post Share on other sites
ianc Posted August 20, 2021 Report Share Posted August 20, 2021 James - I thought you had but one wife: Alison. During lockdown in France, in addition to TR and boating, have you started an additional hobby: polygamy? Ian Cornish Quote Link to post Share on other sites
TorontoTim Posted August 20, 2021 Report Share Posted August 20, 2021 As the joke goes... "I have two wives, is that bigamy?" "Yep, that's big of you..." Quote Link to post Share on other sites
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