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tach not working

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Old Sep 1, 2016 | 10:47 PM
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Default tach not working

I have a 1974 bb the tack dose not work. When I spin the dis. end of cable it moves what do I check next Help Thanks.
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Old Sep 2, 2016 | 07:43 AM
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Does the tach work when you spin the distributor end of the cable or does it just move (bounce around)?
Use an electric drill and spin the cable, if the tach is working, the problem is with the drive gear in the distributor. You can pull the distributor and replace them.

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Old Sep 2, 2016 | 07:56 AM
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Originally Posted by sportster89
...what do I check...
Check the connection on the back of the tach. The drive cable must be fully seated in the tach head.

Last edited by Easy Mike; Sep 2, 2016 at 07:56 AM.
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Old Sep 2, 2016 | 08:43 AM
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Which way do you spin the cable? Ive always wanted to know
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Old Sep 2, 2016 | 08:52 AM
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pull the brass coupler on the distributor #584 in the pic and inspect the gear
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Old Sep 2, 2016 | 10:23 AM
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Originally Posted by sportster89
I have a 1974 bb the tack dose not work. When I spin the dis. end of cable it moves what do I check next Help Thanks.
When I spin the dis. end of cable it moves...

What is 'it'? do you mean when you spin the cable the tach needle moves or when you spin the cable, the cable moves?
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Old Sep 2, 2016 | 06:02 PM
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Default tach

Originally Posted by joewill
When I spin the dis. end of cable it moves...

What is 'it'? do you mean when you spin the cable the tach needle moves or when you spin the cable, the cable moves?
I am sorry,when I spin the cable. the tach needle moves.
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Old Sep 2, 2016 | 06:07 PM
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Default tach

Originally Posted by Rescue Rogers
Which way do you spin the cable? Ive always wanted to know
I spun the cable Counter- clock- wise.

Last edited by sportster89; Sep 2, 2016 at 06:10 PM. Reason: not a complete thought.
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Old Sep 3, 2016 | 10:15 AM
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then either your cable is not seated and the cable housing is not screwed in tight to the distributor, or your gearing is stripped.
the would be part #577, or #586 in the chart above.
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Old Feb 2, 2019 | 10:01 PM
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Stripped distributor shaft gear and cross gear are a common ailment on these. I've replaced the shaft and gear twice and the cross gear at least 4 times on my '71 which I've owned for 45 years. I even clocked the dist. when I first got it so the cable would run parallel to the firewall out of the dist.
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