Thanks. Of course Haynes says nothing about any of this. and yes I meant
15mph. Although I sure my race MGB could do 60mph in second (what would
that be 10,000rpms?), this 67 is just lucky to make it to second gear.:}
>-----Original Message-----
>From: barneymg@juno.com [SMTP:barneymg@juno.com]
>Sent: Friday, April 25, 1997 1:49 PM
>To: Randy Rees
>Subject: Re: 67 pos earth tach read too high
>
>On Fri, 25 Apr 1997, you wrote:
>
>> I just got the 67 GT that had been stored for about 13 years running
>in second gear at not more than 156 miles an hour it shows 6500 rpm's
>..what is the problem here?
>
>Just guessing you meant 15 mph. So, you need to calibrate the tach.
>
>There is a small "volume control" inside the tach, but you must remove
>the tach from your dash, remove the back of the tach (the can) and
>reattach the wires you removed to get this far. This "volume control" is
>adjustable with a small screwdriver. I'm talking small here, like
>typewriter repairmen used to carry around in their shirt pocket. Jack up
>the rear end of your car and put jack stands under the axle at each rear
>spring. Climb in the car, and holding the tach that you removed from the
>dash, removed the back (can), and reconnected all the wires to get this
>far, (with me so far?). Holding the tach so that you can see the
>"volume control", start the car. Tach should read as before you removed
>it. Now adjust it with the "volume control". With the car in 4th gear
>and wheels turning at 55mph (per speedometer that you have confidence
>in), set the tach to read 3000rpm. Turn off the car and reassemble and
>reinstall the tach. If you have a dwell meter that has a high speed tach
>(up to 3000rpm or so), Forget the wheel spin at 55mph. Just adjust the
>tach to read the same as the standard (the one in the dwell meter). If
>you don't have a dwell meter with a high speed tach and you have no
>confidence in your speedometer --- follow somebody with a speedometer
>that you do trust. Mark it for "true" 55mph and follow instructions
>above.
>
>Good luck,
>
>Barney Gaylord
>1958 MGA
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