Jim F Posted April 9, 2020 Report Share Posted April 9, 2020 Hi all. I have a speedo problem. The needle either was slow to respond or didn't respond at all. So I remove the speedo from the dash, removed the rear casing and, when I rotate the speedo drive the drag cup isn't responding. Is there a detailed article (or better still a video!) where a speedo is dismantled and the drag cup repaired? Its a smiths - sn 6409/04. Thanks Quote Link to post Share on other sites
RobH Posted April 9, 2020 Report Share Posted April 9, 2020 This might be of assistance Jim: https://obswww.unige.ch/~wildif/cars/docs/Smith-jaeger_speedo_repair.pdf Quote Link to post Share on other sites
RogerH Posted April 9, 2020 Report Share Posted April 9, 2020 here is a Utube clip that may help Roger Quote Link to post Share on other sites
Jim F Posted April 9, 2020 Author Report Share Posted April 9, 2020 Rob, thank you for the doc. The schematic shows the area that is, I think, the problem - the drag cup needle bearing. I wonder how that gets repaired.. Roger, the utube link didn't show. Could you repost? Thanks. Jim Quote Link to post Share on other sites
ed_h Posted April 10, 2020 Report Share Posted April 10, 2020 Some pictures of the inside that may help: http://bullfire.net/TR6/TR6-40/TR6-40.html Ed Quote Link to post Share on other sites
John L Posted April 10, 2020 Report Share Posted April 10, 2020 I used some brake cleaner to flush thru the bearing, then some very fine oil, seems to have worked, be very careful of the fine watch spring in there that balances the needle. John Quote Link to post Share on other sites
Mike C Posted April 10, 2020 Report Share Posted April 10, 2020 Last time I cleaned my tacho I used electrical contact cleaner for cleaning and silicon spray lube. I don't know how long the silicon lube will last but I was worried about drag from mineral oil as it dried out. Quote Link to post Share on other sites
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