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Place the ring compressor over the bezel, lining up the bottom of the bezel with the bottom of the ring compressor ratchet tightening band. The masking tape serves two purposes, it provides a high friction coefficient surface and protection to the beauty chrome. With the protective masking tape still in place you can proceed. The modification is to shorten the ring compressor to the tightening ratchet band. This would be the type that has a ratchet band around an expandable, contractible, metal cylinder. The best method is to modify a ring compressor. The trouble with a strap wrench is that the cam action required to tighten causes a hard pressure point on the circumference of the bezel at the point of the cam action. The Rapide speedo can be mounted as well in a vise, leaving the mounting plate attached. The Shadow speedo can easily be mounted in a vise with the mounting plate still attached. The next step is to mount the instrument securely so the bezel can be removed. #Smiths chronometric speedometer serial numbers serial numbers#Smiths Chronometric Speedometer Serial Numbers Any blow on the bezel without this protection will inevitably cause chrome luster loss due to abrasion. The masking tape protects the beauty chrome from damage. It only takes a slightly enthusiastic blow with a mallet to cause the bezel to jump thread, thereby causing a cross threading of the bezel. Don't tap on the bezel's glass flange, especially with the gasket removed. With a rawhide mallet you can now tap lightly around the circumference of the bezel.Īs the brass bezel is thin and relatively soft, the rawhide's light blow easily disturbs the female and male threads, and loosens any corrosion grip. Wrap the outer circumference of the bezel three times with 1/2' masking tape. Replace the instrument in the penetrant bath and wait until morning. The purpose of removing the gasket is to allow passage of the penetrant to the threads in the opposite direction from the external soak. After about six hours remove the instrument, and with a razor blade, try to remove the gasket between the bezel lip and the instrument face glass. Fill a sauce pan about 1' deep with a good penetrant, then place the instrument face down in the penetrant. The first day is consumed with the bezel in a penetrant soak. The best way to remove the bezel without damage takes a couple of days. The bezels on most speedos and tachs are quite thin, and usually made of brass.īrass plates well, requiring no copper, so the bezels are normally nickel plated, then beauty chromed. The objective is to remove the bezel without distorting or destroying the beauty chrome. A lot of the old iron will exhibit vise grip damage, and even in extreme cases, chisel marks created by some well meaning and dedicated novice. Vincent Technical Sections: - Vincent Instruments - Speedo - Tachometer - Cables Chronometric restoration: ernie lowinger 3/18/10 Smiths Vincent Instruments info: Bezel Removal: Bezel removal can be a real pistol. These clocks were also made by Smiths and on. ![]() There are a number of different variants of speedo which. #Smiths chronometric speedometer serial numbers how to#Guessworks How to find the TPM of your speedometer. ![]() In1963 the British motorcycle industry approached Smiths Industries to manufacture a cheaper 3” Speedo as the chronometric was too expensive for mass produced machines. ![]() X 80421 OR SN31xx/xx for Speedo RNxxxx/xx for Tacho SPEEDOMETERS USED FROM 1964. ![]() The chronometric movement is the same in all chronometric Speedo. Serial Numbers/Production-Photo Gallery of Models. ![]()
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