inoperable 67 tach - Team Camaro Tech
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post #1 of 9 (permalink) Old Jul 15th, 11, 08:04 PM Thread Starter
Bill
 
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inoperable 67 tach

Hello to everyone. I'm a first timer and would love a little help.
I'm finally getting my 67 back together after a 5 year frame off. I have all lights and gauges working except for the tach. I have double checked wiring and still no go. I'm about to pull the cluster out again and wondered if there is any easy way to bench test the tach itself.
Tach was purchased new and could possibly be bad????
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post #2 of 9 (permalink) Old Jul 15th, 11, 08:31 PM
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Re: inoperable 67 tach

Maybe but are you using factory setup for ignition - is the Dizzy factory?
To test the tach you will need a pulse generator or a running car that has points to hook up to the coil.

There are testers that send the correct pulse out there for bench testing. Just make sure non HEI are options on the one you get. http://www.msdignition.com/product.a...7&terms=tester

Do you get any movement at all when it is hooked up to the coil?


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post #3 of 9 (permalink) Old Jul 16th, 11, 05:50 AM Thread Starter
Bill
 
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Re: inoperable 67 tach

Thanks for the reply.
I am using the original points type distributor along with an MSD Street Fire box. I hooked another tach to the box to check it and it worked fine. I also tried an MSD 8910 tach adapter and still nothing. The tach just lays on 0 and never moves.
I noticed the instructions that came with the MSD box said that there may be an inline suppressor on the oe tach wire that must be wired around however I have not located one on my car.
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post #4 of 9 (permalink) Old Jul 16th, 11, 07:01 AM
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Re: inoperable 67 tach

Quote:
Originally Posted by kinyurd View Post
Thanks for the reply.
I am using the original points type distributor along with an MSD Street Fire box. I hooked another tach to the box to check it and it worked fine. I also tried an MSD 8910 tach adapter and still nothing. The tach just lays on 0 and never moves.
I noticed the instructions that came with the MSD box said that there may be an inline suppressor on the oe tach wire that must be wired around however I have not located one on my car.
The other tach you used that worked that was OEM or aftermarket tach?

Don't know for sure about 67 or 68 but in 69's the "filters" are inside the tach housing not on the wire, you have to remove the circuit board connector and tap direct into the wire leads from there in after market situations.

The 8910 adapter filter may have been wrong for an OEM Tach. Seem to remember someone here or over at CRG had issues after converting to MSD and had to use a different MSD filter listed on their website due to the internal filters.


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post #5 of 9 (permalink) Old Jul 16th, 11, 07:47 AM Thread Starter
Bill
 
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Re: inoperable 67 tach

The tach I tried was aftermarket. I'm going to pull the cluster and see if I can find the suppressor. Thanks for your help and wish me luck.
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post #6 of 9 (permalink) Old Jul 16th, 11, 08:37 AM
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Re: inoperable 67 tach

The 69 is easy to get to and bypass. Hope you find the same for 67


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post #7 of 9 (permalink) Old Jul 16th, 11, 09:43 AM Thread Starter
Bill
 
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Re: inoperable 67 tach

Brian, Thanks for your help. I removed the cluster and found mine didn't have a filter but I did find a seperated ground wire. I replaced it and checked all other connections and IT WORKS!!! HOORAY!!
Things like this can really get on the nerves but it sure feels good when you finally find the problem.
Thanks again and best of luck, Bill
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post #8 of 9 (permalink) Old Jul 16th, 11, 09:59 AM
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Re: inoperable 67 tach

good deal Bill.


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post #9 of 9 (permalink) Old May 27th, 12, 01:36 PM
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BARTELL
 
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Re: inoperable 67 tach

Kinyurd
Where is that ground wire you found broken?

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