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57_BN4
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I have here a 57 and a 62 Healey that both have the same wavering speedo needle. Always have had so the stories go.
The needle will stay on speed say 60mph then dip to 50, rise to 70 and swing back to 60 for a second and repeat. It is perfectly in time with the odometer advancing, as if the increased load of the odometer(s) operating is enough to temporarily slow the spinning magnet, then as the cable unwinds it flicks the needle higher momentarily.
The speedo on the (my) 57 has been lightly lubricated inside but not disassembled, the 62 has never been apart. Putting a battery drill on the stub end of the angle drive gives the same result but the wavering is much smaller, only about 1-2mph change. Speedo cables are both visually as-new but of unknown age.
Anyone else have this situation? Is there a cure?
Andy.
The needle will stay on speed say 60mph then dip to 50, rise to 70 and swing back to 60 for a second and repeat. It is perfectly in time with the odometer advancing, as if the increased load of the odometer(s) operating is enough to temporarily slow the spinning magnet, then as the cable unwinds it flicks the needle higher momentarily.
The speedo on the (my) 57 has been lightly lubricated inside but not disassembled, the 62 has never been apart. Putting a battery drill on the stub end of the angle drive gives the same result but the wavering is much smaller, only about 1-2mph change. Speedo cables are both visually as-new but of unknown age.
Anyone else have this situation? Is there a cure?
Andy.