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janman33
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-- 05-29-2011 @ 6:15 AM
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RE: '49 MERCURY; ON THE HEX SIDES OF THE TEMP. SENDING UNITS IN THE CYLINDER HEADS IS STAMPED THE NUMBERS 217 ON THE DUAL TERMINAL AND 224 ON THE SINGLE TERMINAL. WHAT DO THESE NUMBERS SIGNIFY?
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supereal
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-- 05-30-2011 @ 8:31 AM
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We always assumed they had something to do with the temperature rating. However, since the same units were used for most, if not all, flatheads thru '53, and even into the "Y" block years, those numbers probably indicate the manufacturer of the senders. I haven't been able to uncover any other explanation. Most of today's repros have no numbers.
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janman33
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-- 05-30-2011 @ 6:49 PM
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Thank you for your reply supereal. Are they the same in the 12V cars, like '56 ford y blocks? No difference in voltage?
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supereal
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-- 05-30-2011 @ 8:18 PM
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The twelve volt cars and trucks require the twelve volt senders. The King Seely senders have a heating coil in them to bias the bimetallic contact strip. Both six and twelve volt senders are available from vendors. The two terminal sender works on both voltages as it just opens above the boiling point and doesn't have the internal coil.
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