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Author Topic: Tach problem  (Read 6642 times)

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december2009

  • Message Board Member not current AMGBA Club Member
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  • Posts: 8
Tach problem
« on: November 30, 2009, 05:37:44 PM »
My Smiths tach on my '66 MGB indicates too high, and it gets higher when it has run for awhile.  I don't see anything on this in the two tech manuals I have.  Any suggestions?  -  Don

Art

  • chfwrench
  • AMGBA Club Tech Staff
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  • Posts: 246
  • Memberhsip Number (if known):: 91-10014
  • MG information: '73 red B roadster
Re: Tach problem
« Reply #1 on: December 11, 2009, 02:40:04 PM »
Hey Don,

This sounds like an internal resistor problem with the electronic Tach, but I would suggest trying a different external tach to verify. 

The old tune-up multi-meter units that had a tach and dwell meter for the points should do it or hooking-up a Sun or RAC aftermarket external tach, which can often be found cheap at flea markets, swap meets and garage sales

Replacing the tach or brining it to an electronics shop to test components and repair might be the solution.

I hope that helps.  Good luck.

Art
Art Isaacs
AMGBA Tech Staff
chfwrench@aol.com


 

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