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8 & 10 cyl Bristol cars Type 407 onwards - restoration, repair, maintenance etc

Bristol 410 Clock

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Old 18-05-22, 01:47 PM
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Default Bristol 410 Clock

Hi there,
Can anyone tell me please if it is possible and how to regulate the Smiths Clock. Mine is galloping away, gaining about 10 minutes every day.
Thanks
Andrew
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Old 18-05-22, 03:21 PM
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Default 408 Smiths Clock

Having had mine rebuilt twice over the last 23 years, mine is now set at 12.00 and at least is is accurate twice a day.! 😇 😀 😉
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Old 18-05-22, 04:25 PM
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Thanks. Mine has also been repaired in the past!
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Old 18-05-22, 05:37 PM
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I bought a new one from a gauge specialist. It doesnít work.
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Old 18-05-22, 10:47 PM
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Quote:
Originally Posted by Nick Challacombe View Post
Having had mine rebuilt twice over the last 23 years, mine is now set at 12.00 and at least is is accurate twice a day.! 😇 😀 😉
I have one just like that and I'll bet we're not the only two to have them

David
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Old 19-05-22, 01:13 PM
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Default 403 clock

When I bought my 403 the clock has had its mechanism replaced with a modern unit which is powered by a double A battery. It doesnt work either.
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Old 21-05-22, 09:43 PM
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I had a Smith's clock in one 410 and a Kienzle in the other. The latter is still going strong. Like others I had an electronic upgrade for the clock in my 403. I don't think it lasted a year - but that was about 30 years ago so things may have improved since then.
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Old 22-05-22, 10:42 AM
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As you will have gathered from the previous replies the Smiths clocks, which were fine in their day, generally havenít stood the test of time at all well. As I understand it they rely on a electrical contact being made by the balance wheel to energise a small electromagnet that drives the clock. Not surprisingly that mechanical electrical contact tends to fail eventually as itís been activated with every tick of the clock whilst it was working. Thatís an awful lot of ticks over 50 plus years. Moreover each tick causes a tiny arc across the contact which also doesnít contribute to longevity

You should perhaps hold a little celebration that your clock is working at all - no make it a big celebration!, itís a rare bit of kit if itís still working at all. Presuming that it is indeed the original clock itís relatively easy to adjust in that there is a small screw head on the front which may even still have the original + - marks on it to indicate which way you should turn it to cause the clock to run faster or slower. From memory I think one turns it clockwise to slow the clock, but Iím really not sure on this point. Never turn the screw by more than about an eight of a turn at a time, then leave well alone for 24 hours and check out success or failure.

Those who have one of the always right twice a day clocks may care to take a look at https://www.clocks4classics.com/ These clever people have developed an electronic optical sensor to replace the electromechanical contact. I see they offer a kit, which looks incredibly fiddly, or theyíll do it for you.
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