Restore your clock for a tenner

Have you documented a Scimitar related procedure and would like to share it with others? Pictures are most welcome!
Threads here also contain previous “stickies” from other sections, as a central location for quick reference information.

Moderators: scimjim, philhoward, erikscimitardemon, Roger Pennington, Lukeyboy46

User avatar
toomanysabres
RIP
Posts: 5381
Joined: Sun Nov 12, 2006 2:27 pm
Location: Leatherhead
Has thanked: 14 times
Been thanked: 88 times

Re: Restore your clock for a tenner

Post by toomanysabres » Tue Oct 30, 2012 8:43 pm

chrisgallacher wrote:Yep, go for it Roger.

I might admit to having a real Blue Peter badge in a folder somewhere :oops: (from my childhood, I hasten to add...)
As long as it isn't a Jim Fixed It For Me badge


Now: '62 Sabre 4, '63 Sabre Six, '65 SE4, '00 BMW E38 740i sport.
Prev: '53 ZephyrZodiac, '64 Sabra GT, '68 Elan S3SE, Mk3 Cortina 2000GXL, Mk4 Cortina 2000 Est, 3 SE6a's, 2 SE5a, SE4a Turbo, 1800Ti.
Company: Cav SRi, Cav SRi 130, Honda Concerto 1.6 (yuk)

User avatar
scimjim
RSSOC Member
Posts: 35642
Joined: Sun Oct 01, 2006 10:08 pm
Location: Gloucester
Has thanked: 113 times
Been thanked: 810 times

Re: Restore your clock for a tenner

Post by scimjim » Tue Oct 30, 2012 8:47 pm

How far can you "overvolt" a quartz clock before it complains?


Jim King

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), Sabre/MX5 auto (The Flying Broomstick),
1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

User avatar
toomanysabres
RIP
Posts: 5381
Joined: Sun Nov 12, 2006 2:27 pm
Location: Leatherhead
Has thanked: 14 times
Been thanked: 88 times

Re: Restore your clock for a tenner

Post by toomanysabres » Tue Oct 30, 2012 8:47 pm

peter freeman wrote:Leave the glass out and turn the pointers by hand - joke.
OR
Follow this procedure. It only works at 8 o'clock though.
http://www.youtube.com/watch?v=-tjHlFPTwVk&noredirect=1


Now: '62 Sabre 4, '63 Sabre Six, '65 SE4, '00 BMW E38 740i sport.
Prev: '53 ZephyrZodiac, '64 Sabra GT, '68 Elan S3SE, Mk3 Cortina 2000GXL, Mk4 Cortina 2000 Est, 3 SE6a's, 2 SE5a, SE4a Turbo, 1800Ti.
Company: Cav SRi, Cav SRi 130, Honda Concerto 1.6 (yuk)

User avatar
tony.idle
RSSOC Member
Posts: 3463
Joined: Mon Jan 29, 2007 4:31 pm
Location: Kendal, Cumbria
Has thanked: 1 time
Been thanked: 55 times

Re: Restore your clock for a tenner

Post by tony.idle » Wed Oct 31, 2012 12:14 am

Nice work Chris :D

I wonder if there are any movements that can be adjusted using a switch? The one in a Smart car (analogue dial) works like that as does the Ford Mondeo (& other Fords I think). The Ford clocks are oval & may have small movements. A quick & dirty 1.5-ish volts regulator can be two silicon diodes & a resistor in series. Take the output from the end of the diodes. It's nearer 1.2v but probably OK for a clock - just saves a bit of room.


Regards

Tony

Embrace your feminine side - RTFM

RSSOC 2332 since 1981
Past: 2x5A, GTC. Current: SST, Smart, Hymer Motorhome, Rialto, Robin, Bug, MZ Skorpion x2.

User avatar
toomanysabres
RIP
Posts: 5381
Joined: Sun Nov 12, 2006 2:27 pm
Location: Leatherhead
Has thanked: 14 times
Been thanked: 88 times

Re: Restore your clock for a tenner

Post by toomanysabres » Wed Oct 31, 2012 10:27 am

The slight downside of that is doing the resistor calc to minimise unnecessary heat. Need If min of the diodes to maintain 0.6V drop + I(clock) then do the calc V (batt min) - 1.2 / sum of the I's. Using a regulator chip makes it easy and avoids wasting excess current and therefore getting too hot. Then the resistor must have sufficient watt rating to withstand V (batt max).


Now: '62 Sabre 4, '63 Sabre Six, '65 SE4, '00 BMW E38 740i sport.
Prev: '53 ZephyrZodiac, '64 Sabra GT, '68 Elan S3SE, Mk3 Cortina 2000GXL, Mk4 Cortina 2000 Est, 3 SE6a's, 2 SE5a, SE4a Turbo, 1800Ti.
Company: Cav SRi, Cav SRi 130, Honda Concerto 1.6 (yuk)

User avatar
philhoward
RSSOC Member
Posts: 24007
Joined: Tue Aug 29, 2006 5:41 pm
Location: Staffs, UK
Has thanked: 41 times
Been thanked: 525 times
Contact:

Re: Restore your clock for a tenner

Post by philhoward » Wed Oct 31, 2012 10:29 am

For the current involved, I'd guess you'in the territory of a zener diode instead?


Phil Howard
Scimitarweb Forum Admin
SS1 1600 Rooster Turbo; Sabre Mk1.5, Sabre Mk2
Previous: SE5/5a/SS1 No.1/SS1 Rooster/SS1 1800Ti/SE5a 24 Valve
http://www.ss1turbo.com
Never try and argue with an idiot. They drag you down to their level, then beat you based on experience.

User avatar
AJL Electronics
RSSOC Member
Posts: 7419
Joined: Fri Oct 17, 2008 8:49 pm
Location: Gloucester
Has thanked: 42 times
Been thanked: 206 times
Contact:

Re: Restore your clock for a tenner

Post by AJL Electronics » Wed Oct 31, 2012 10:36 am

A conventional diode works in the same way for a drop of 0.6v. If you want to be clever and get 1.4V, then two silicon and one germanium diode will do that.


Yes, we can mend your Scimitar!
Order your Scimitar parts any hour of the day at http://www.classicmicrocars.com (member's discounts).

Fancy a holiday in Gael, France? http://www.ianrhu.com

There is no point trying to teach a pig to sing. It doesn't work and it annoys the pig.

User avatar
toomanysabres
RIP
Posts: 5381
Joined: Sun Nov 12, 2006 2:27 pm
Location: Leatherhead
Has thanked: 14 times
Been thanked: 88 times

Re: Restore your clock for a tenner

Post by toomanysabres » Wed Oct 31, 2012 10:37 am

Not sure you can get zeners that small a voltage


Now: '62 Sabre 4, '63 Sabre Six, '65 SE4, '00 BMW E38 740i sport.
Prev: '53 ZephyrZodiac, '64 Sabra GT, '68 Elan S3SE, Mk3 Cortina 2000GXL, Mk4 Cortina 2000 Est, 3 SE6a's, 2 SE5a, SE4a Turbo, 1800Ti.
Company: Cav SRi, Cav SRi 130, Honda Concerto 1.6 (yuk)

User avatar
chrisgallacher
RSSOC Member
Posts: 650
Joined: Tue Oct 07, 2008 6:01 pm
Location: Four Marks, Hants
Has thanked: 30 times
Been thanked: 24 times

Re: Restore your clock for a tenner

Post by chrisgallacher » Wed Oct 31, 2012 10:44 am

Seems hardly worth it when you can buy a pack of ten LM317 adjustable voltage regulators off ebay for just over £3 delivered. Very versatile things to have handy.


Chris Gallacher
RSSOC Rally Secretary
rally.secretary@rssoc.co.uk

User avatar
toomanysabres
RIP
Posts: 5381
Joined: Sun Nov 12, 2006 2:27 pm
Location: Leatherhead
Has thanked: 14 times
Been thanked: 88 times

Re: Restore your clock for a tenner

Post by toomanysabres » Wed Oct 31, 2012 10:49 am

If you have a 10v electronic volt regulator for the temp gauge then you can avoid having to take care of V (batt max) and by using an 8.2 volt zener 'upside down' to generate 10-8.2=1.8 volts.
http://uk.farnell.com/jsp/displayProduc ... ctlistings
They are only 7.2p each :drum:


Now: '62 Sabre 4, '63 Sabre Six, '65 SE4, '00 BMW E38 740i sport.
Prev: '53 ZephyrZodiac, '64 Sabra GT, '68 Elan S3SE, Mk3 Cortina 2000GXL, Mk4 Cortina 2000 Est, 3 SE6a's, 2 SE5a, SE4a Turbo, 1800Ti.
Company: Cav SRi, Cav SRi 130, Honda Concerto 1.6 (yuk)

User avatar
tony.idle
RSSOC Member
Posts: 3463
Joined: Mon Jan 29, 2007 4:31 pm
Location: Kendal, Cumbria
Has thanked: 1 time
Been thanked: 55 times

Re: Restore your clock for a tenner

Post by tony.idle » Wed Oct 31, 2012 12:51 pm

chrisgallacher wrote:Seems hardly worth it when you can buy a pack of ten LM317 adjustable voltage regulators off ebay for just over £3 delivered. Very versatile things to have handy.
Agreed. I only suggested diodes because of the very low current requirements of the clock & the possibility of saving space. It's possible to use very small diodes which can be handy when room is tight. Certainly not to save pennies by avoiding an AVR.


Regards

Tony

Embrace your feminine side - RTFM

RSSOC 2332 since 1981
Past: 2x5A, GTC. Current: SST, Smart, Hymer Motorhome, Rialto, Robin, Bug, MZ Skorpion x2.

Stephenl
RSSOC Member
Posts: 467
Joined: Thu Nov 10, 2011 4:34 am
Location: California
Has thanked: 5 times
Been thanked: 9 times

Re: Restore your clock for a tenner

Post by Stephenl » Mon Feb 18, 2013 3:03 am

I'm in! At last, this is what I have been looking for. No more staring at cheap clocks in pound shops and the like and wondering if they will fit inside the case in some way.

There is a guy in Hilldenbrough Kent who sells old gauges on eBAY who just ships out faulty clocks claiming they work and has no way of fixing them. Not sure on the rules here, so I wont name and shame.
I returned the one I bought but he never refunded my money; I had to take him to court (he paid up immediately he got the paperwork). This looks like a much better bet.


'69 SE5

User avatar
toomanysabres
RIP
Posts: 5381
Joined: Sun Nov 12, 2006 2:27 pm
Location: Leatherhead
Has thanked: 14 times
Been thanked: 88 times

Re: Restore your clock for a tenner

Post by toomanysabres » Mon Jul 07, 2014 10:24 am

Thought I would update this with some pics which are different to Chris's.

My Sabre Six Clock; this works but I had to be a bit inventive as its +ve earth, especially with the illumination bulb.
Sabre Six Clock.JPG
Sabre Six Clock.JPG (381.57 KiB) Viewed 1619 times
My S6 Coupé clock, removed since the Halda Speed Pilot fouls the hole.
S6 Coupe Clock.JPG
S6 Coupe Clock.JPG (69.01 KiB) Viewed 1597 times


Now: '62 Sabre 4, '63 Sabre Six, '65 SE4, '00 BMW E38 740i sport.
Prev: '53 ZephyrZodiac, '64 Sabra GT, '68 Elan S3SE, Mk3 Cortina 2000GXL, Mk4 Cortina 2000 Est, 3 SE6a's, 2 SE5a, SE4a Turbo, 1800Ti.
Company: Cav SRi, Cav SRi 130, Honda Concerto 1.6 (yuk)

ard126k
Posts: 588
Joined: Tue May 24, 2011 4:24 pm
Location: Fife
Has thanked: 3 times
Been thanked: 17 times

Re: Restore your clock for a tenner

Post by ard126k » Thu Mar 12, 2015 10:40 pm

Thanks for this Chris I've just finished re-animating my SE5 clock. I thought of doing the hand adjustment via a length of flexible curtain rod from the clock poking out under the dash but it didn't work because the adjustment shaft of the movement wasn't willing to carry the weight.
Absolutely brilliant guide though.
Alex.


1971 SE5 1977 SE6 1982 GTC

User avatar
chrisgallacher
RSSOC Member
Posts: 650
Joined: Tue Oct 07, 2008 6:01 pm
Location: Four Marks, Hants
Has thanked: 30 times
Been thanked: 24 times

Re: Restore your clock for a tenner

Post by chrisgallacher » Sun Mar 22, 2015 12:55 pm

ard126k wrote:I revitalised the clock in my SE5 following your 'How to' guide but I seem to have hit a snag. The clock ran fine in the car in the garage but when I took it out for the first run of the year I found the clock stops when the engine is running and starts again with engine off! I don't know much about electronics, which is why I was so grateful for your guide, so I'm wondering if you had any hints as to what I've done wrong?
Alex, I'm guessing that ignition interference is upsetting the internals of the quartz clock somehow. Can you have a think about the following questions which should help to get it sorted :)

1. Do you use supressed ignition leads and/or plug caps on your car?
2. When the engine is running can you use the radio OK - or is it swamped by ignition interference?

If the answer to the above is no, then fix these points first and you'll probably find the problem goes away. Otherwise:

3. What arrangements did you make to derive the 1.5v supply to the clock? Did you use a voltage regulator e.g. the LM317 as I did, or what exactly? If you did use a voltage regulator, did you build it into the back of the clock case or did you mount it somewhere externally with a long lead to the clock?
4. Did you build the clock into the back of the existing metal case? This should provide some screening from ignition interference, so ditching the case altogether probably isn't a good idea.
5. So the clock works fine when the engine is not running. What about at idle sat on the drive - is it OK then? If yes, try increasing the revs steadily - do you reach a point where the clock stops and if so does it start again when the revs fall back?

My guess is that you'll need to provide some extra filtering on the input/output to/from the voltage regulator if that's what you used and this should sort it quite easily, but let's get the basis sorted first.


Chris Gallacher
RSSOC Rally Secretary
rally.secretary@rssoc.co.uk

Post Reply

Return to “How To Guides/FAQs”