234 MG Tech | Flicking Speedometer on MGB

Usually you have a bad cable. But let's be honest, John has seen it all, here is what it might be.

[@jett3332]

This man is a wealth of info. Stay on it.

[@annelmanson]

I rember this from when mine was still under warranty.That is not quite 40 years ago.John,whatyou do is important.keep it up.

[@dpforth]

Excellent tip. My speedo was flicking around and reading low above 30. After watching this found my nut less than finger tight, only retained by the tab washer.

[@UnderseaCaveman]

I was having a ridiculous run-around with this. Finally discovered, new speedcable and new angle drive were not engaging (totally slipping, speedcable is oval-ed, but didn't quite do it). I wrapped it with Teflon tape (and used two copper washers to ensure the angle drive doesn't bottom out)...finally I also disassembled the speedometer itself and sprayed some WD40 on mechanism...it finally works right! ENSURE...the speedometer cable engages the angle drive and lubricate the speedometer.

[@BruceBoschek]

Who would have thought that? Well, I wouldn't have in any case. I knew about the cable, had it happen on my MGA a thousand years ago. Never owned a B so wouldn't have come up against this, I guess. Great tip. Thanks.

[@xfire7]

Just take off the speedo cable from the gearbox and put a drill on it driving anti clockwise to prove your cable and speedo . Then its either this nut or the worm drive .

[@KenPickerill4960]

Gazpacho8, We INVENTED rock and roll. :-)

[@mbamgb]

Do you have the transmission in gear when you tighten the nut?

[@letmeplaymystrat]

Does this procedure apply to a gearbox with Overdrive?

[@carmeloblanda3399]

more info on setting up mgc 6 cylinder distributor drive!

[@jimgow4991]

Anyone know if the Triumph TR4 transmission speedo gear is keyed of relies on the nut?

[@mattness615]

Always replace the speedo cable on a flickering speedo, fixes the problem inexpensively the majority of the time

[@Gazpacho8]

The rock and roll opening doesn't really work with the tweedy reputation of the ageing MG community.

[@richsail47]

love to see a "how to remove the tach" video... having trouble on my 67 B :(

[@urw877g]

Some lighting would be helpful when making a video like this.

[@bigmacdaddy1234]

The lighting is just fine.

[@flynavy2002]

Sounds like conservative b.s.