[British-cars] TR4 mechanical tachometer stopped.

[John T. Blair]

At 05:21 PM 5/27/2008 +0000, pethier at comcast.net wrote:

>..  The rev counter stopped counting revs. 

>What's the most likely cause of sudden total failure?  Broken cable?

Phil,

That would be a quick first guess.  Also it's possible the either end
has loosened and come out of the connector.


>I assume I can disconnect the cable at the distributor end, start the 
>car and determine if the distributor-driven connection is rotating.  

Makes sense.

>Can I put an electric drill motor on the cable to test the 
>cable/tachometer combination?  

Sure.  

>Which direction to I run the drill motor?  

The same direction as the output shaft of the dist. was rotating.

>Will I ruin something if I accidently go the wrong way (on a 
>speedometer. I would not ruin things

Don't know, but possibly!  So be careful.

>it has to deal with the car reversing)?

Not really.  The engine is always turning in the same direction.  The
xmission is resposible for making you go backwards.  However,
since the speedo can handle it, one would think the tach would have
the same mechanics in it to handle a reversal.
 
John


John T. Blair  WA4OHZ     email:  jblair1948 at cox.net
Va. Beach, Va             
Phone:  (757) 495-8229

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