Changing speedo (odometer) readings

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KevR
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Changing speedo (odometer) readings

Post by KevR » Mon Sep 14, 2015 6:09 pm

Yes, I know, but I have a legitimate reason....
I'm about to add GTi instruments to one of the TZDs so I can see proper temperature and pressure info instead of relying on pointless warning lights.

The new clocks have a km/h speedo, which suits me fine as the car's now registered in France so km/h is more useful.

Howver I'd like to alter the new clocks to reflect the original mileage (211,000 and counting).
Anyone know if it's possible to do this without buggering up the mechanism...?
1990 BX TZD Estate ('the grey one', 1991 BX TZD Estate ('the white one'), 1982 2CV6 Charleston (in bits), 1972 AZU Serie B (2CV van), 1974 HY72 Camper, 1990 Land Rover 110 diesel LWB, 1957 Mobylette AV76, 1992 Ducati 400SS, 1966 VW Beetle, 1990 Mazda MX-5, 1996 Peugeot 106D, 1974 JCB 2D MkII, 1997 BMW R1100RS, 1987 Suzuki GSX-R1100, 1978 Honda CX500A, 1965 Motobecane Cady, 1988 Honda Bros/Africa Twin, 1963 Massey Ferguson 825, and a lot of bicycles!

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Re: Changing speedo (odometer) readings

Post by Tinkley » Tue Sep 15, 2015 6:49 am


KevR
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Re: Changing speedo (odometer) readings

Post by KevR » Tue Sep 15, 2015 8:06 am

Thank you!
1990 BX TZD Estate ('the grey one', 1991 BX TZD Estate ('the white one'), 1982 2CV6 Charleston (in bits), 1972 AZU Serie B (2CV van), 1974 HY72 Camper, 1990 Land Rover 110 diesel LWB, 1957 Mobylette AV76, 1992 Ducati 400SS, 1966 VW Beetle, 1990 Mazda MX-5, 1996 Peugeot 106D, 1974 JCB 2D MkII, 1997 BMW R1100RS, 1987 Suzuki GSX-R1100, 1978 Honda CX500A, 1965 Motobecane Cady, 1988 Honda Bros/Africa Twin, 1963 Massey Ferguson 825, and a lot of bicycles!

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David
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Re: Changing speedo (odometer) readings

Post by David » Sat Sep 26, 2015 3:26 pm

I am not sure if it would work as one would be in miles, and the other would be in kilometers, so there must be a mechanical difference in the back of the clock to make the numbers turn faster/ slower for kilometers or miles.

Just let us know the outcome as it would be interesting to know what the difference might be.
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Re: Changing speedo (odometer) readings

Post by KevR » Sat Sep 26, 2015 4:00 pm

Sorry, didn't make myself clear - yes, there'll be a gearing difference. I'll be changing the whole speedo, so it will read in km for both speed and distance. I want to change the reading on the new km odometer to carry on where the old mph clocks left off. So converting 212,000 miles will mean changing the new odo to 340-odd thousand km.
1990 BX TZD Estate ('the grey one', 1991 BX TZD Estate ('the white one'), 1982 2CV6 Charleston (in bits), 1972 AZU Serie B (2CV van), 1974 HY72 Camper, 1990 Land Rover 110 diesel LWB, 1957 Mobylette AV76, 1992 Ducati 400SS, 1966 VW Beetle, 1990 Mazda MX-5, 1996 Peugeot 106D, 1974 JCB 2D MkII, 1997 BMW R1100RS, 1987 Suzuki GSX-R1100, 1978 Honda CX500A, 1965 Motobecane Cady, 1988 Honda Bros/Africa Twin, 1963 Massey Ferguson 825, and a lot of bicycles!

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JayW
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Re: Changing speedo (odometer) readings

Post by JayW » Sat Sep 26, 2015 8:34 pm

I just connected a drill to the back of the speedo head on the bench running at a fair speed, checked how far it had turned in half hour, calculated approximate time and came back about 7 hours later to watch it turn the last 50k.

Final reading was 000002, all lined up perfectly. Was supposed to go in the rebuilt valver.
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Re: Changing speedo (odometer) readings

Post by KevR » Mon Sep 28, 2015 1:33 pm

Might not fit this speedo after all - turning the drive from the back of the unit, it's very notchy, so I expect it's not long for this world. So might stick with mph speedo after all. Still want to fit the oil/water gauges though.
I've now acquired two sets of GTi gauges and one set of (AFAIK) NA diesel ones. Planning to make up a hybrid set for the grey TZD using the large dash clock from the NA diesel gauges, since the rev counter's never worked on the grey one and I don't need it anyway!
Need to get myself some senders before going any further. Can anyone tell me where the oil temp sender sits on the sump on the GTi? I know I can screw it into the sump plug thread, but I drive down some pretty gnarly farm tracks so that's a recipe for ripping it off on on a rock or tree root. Was planning to get a suitable boss and weld/braze it into place as per original.
1990 BX TZD Estate ('the grey one', 1991 BX TZD Estate ('the white one'), 1982 2CV6 Charleston (in bits), 1972 AZU Serie B (2CV van), 1974 HY72 Camper, 1990 Land Rover 110 diesel LWB, 1957 Mobylette AV76, 1992 Ducati 400SS, 1966 VW Beetle, 1990 Mazda MX-5, 1996 Peugeot 106D, 1974 JCB 2D MkII, 1997 BMW R1100RS, 1987 Suzuki GSX-R1100, 1978 Honda CX500A, 1965 Motobecane Cady, 1988 Honda Bros/Africa Twin, 1963 Massey Ferguson 825, and a lot of bicycles!

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Re: Changing speedo (odometer) readings

Post by kiwi » Wed Oct 07, 2015 6:58 pm

One those tasks that is actually quite simple just made more difficult by the ones that want it to be that way. The BX speedometer drums are quite easy to realign just needs a bit of patience. Using a drill has its drawbacks and can damage the mechanism. I know I had to fix one that had been tampered with.
1991 BX19 TZS 04/01/91 (Deceased)
1990 BX19 TRS 27/10/89 (Reborn)
1992 BX19 TXD (Ex UK - K 744 SDF) 15/06/92
1990 BX19 TZS Auto 06/11/1989
1992 BX TZD Turbo Estate (Ex UK) 1/07/91