woodward Posted October 5 Report Share Posted October 5 Hi All, The speedo on my TR4 recently stopped working - went crazy then doesn’t move. I’ve removed it from the car and there is a lot of oil where the cable attaches to the back so looks like the PO has overoiled it or used the wrong oil. I’ve taken the speedo out of its case and removed most if the oil and a short test drive shows it’s working again. However before I fully assemble it, I wanted to get some advice as there is still some oil sitting in the dish which houses the magnet. Should I endeavor to remove all of this (was thinking to spray with carb cleaner) or is some needed? Thinking also that I should pull the inner cable too to remove oil from there but figuring it will be a pain to relocate it in the gearbox end… Thanks Myles Quote Link to post Share on other sites
Ian Vincent Posted October 5 Report Share Posted October 5 I don’t know if a four is the same as a three in this respect but I have never had any difficulty replacing the inner Speedo cable after removing it. Rgds Ian Quote Link to post Share on other sites
Lebro Posted October 5 Report Share Posted October 5 I would remove as much oil as you can but do be very carefull not to damage the hairspring. Bob Quote Link to post Share on other sites
Charlie D Posted October 6 Report Share Posted October 6 The way that the speedo works relies on the fact that there is no direct mechanical coupling between the cup and the magnet (the bit that is spun by the speedo cable.) The fact that there is oil in the cup probably means that the gap between the magnet and the cup would no longer be there and the cup could be “Dragged” by the magnet, more than the simple magnetic coupling does. I’d try to get the inside of the cup as dry as possible. You could try cotton wool buds, but you would have to be careful not to leave any bits of cotton wool in the cup. I’d be very wary of using a spray to try to clean it out. Get a bit on the dial face and you may well dissolve part of the paint! Better to get a very small artists paintbrush and apply the cleaner with that, allowing it to drip out and hopefully take the oil with it. Charlie. Quote Link to post Share on other sites
ricky30dk Posted October 7 Report Share Posted October 7 I would also advise to remove the rear rubber gasket and wash it in soapy water - oil/grease will, over time, turn this into black soup Quote Link to post Share on other sites
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