3sync speedo

Technical MGB discussion
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Gary j
Posts: 3
Joined: Tue May 03, 2022 8:48 pm
Forename: Gary
Surname: Johnson

3sync speedo

Post by Gary j »

The speedo on my 1967 3 sync car has been problematic when coming out of storage, last year i replaced the angle drive with a new old stock piece and the speedo started working again. However this year its not working again. If i put a drill on the cable at the gbox end the gauge reads so I am confident the cable and speed head are ok. I have removed the angle drive and all seams free.

Do anyone have any experience of the Gearbox drive suddenly stopping working after a period of un use.


Any advice welcome thanks!
Not_Anumber
Posts: 237
Joined: Tue Sep 22, 2020 9:33 am
Forename: Chris
Surname: S
Location: UK

Re: 3sync speedo

Post by Not_Anumber »

My guess would be the cable slipping. A worn cable end could work fine when clamped in the chuck of a drill but slip when run by the angle drive.
1979 MGB GT
2003 MG TF
Vic Butler
Posts: 787
Joined: Wed Dec 21, 2016 6:07 pm
Forename: Vic
Surname: Butler
MGCC Member: Yes
MGOC Member: Yes
Location: North West Hampshire

Re: 3sync speedo

Post by Vic Butler »

I had a non operative speedometer with my Land Rover. It was down to the cable being a loose fit in the replacement speedometer drive. A cable from a different manufacturer cured it although I suppose the speedometer drive output could be squeezed together a bit.
1977 Stage 2 MGB GT
1975 SWB Series 3 Land Rover with a later 2.5 petrol engine
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