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September 29th, 2008

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Q & A: Speedometer

Wednesday March 27th, 2002
Q & A, MGA, MGB, MGC, MG T-Type, Midget
John,

The first time I heard of you was back in the early 80's when you were
writing for Abingdon Classics. I called you back then for advise too!
My
problem is with my 1979 MGB, after running for 1/2 hr or so my
speedometer
cuts out. I am stumped on what to change. I have a new cable to put in,
but a quick inspection of the origional doesn't find anything grossly
wrong
compared to the new one. The car only has 47K miles on it. Is there any
way to check to two right angle assemblies, both seem to move freely, and
I
hate to take a guess as they are fairly expensive. I would appreciate
any
suggestions.

Thanks,

Mike

Mike!

There are very few components in this system: Gear on the gearbox
mainshaft; pinion gear on the gearbox; 90 degree drive unit on the gearbox;
speedo cable; speedometer. Which one is at fault? My guess is... read more