Tach on a 76
Thread Starter
Instructor
Joined: Mar 2005
Posts: 156
Likes: 2
From: collingswood nj
Tach on a 76
The tach on my 76 is stuck at 2grand when i rev the engine up past 2 grand the tach moves as normal but comes to rest again at 2 grand does the tach need to be replaced or is there something that can be done to correct it
Last edited by Black76; Mar 24, 2005 at 01:38 PM.
Drifting
Joined: Nov 2003
Posts: 1,634
Likes: 4
From: Northern NJ
St. Jude Donor '04 & '05
The 76 is an electronic tach while the 73 is a mechanical cable driven version.
The issue w/the 76 may be the tach board itself, but could also be the tach filter. This device is there to prevent electrical spikes from damaging the tach circuit board. It is located inline w/the wire coming from the distributor and going to the tach. On my 75 it is bolted to one of the rear bolts on the top drivers side of the intake manifold. It's a tubular can and can be tested by simply removing both the input and output wires and connecting them together. If this helps I'd suggest you don't leave it this way as it could end up damaging your tach. However I'm sure you will get responses from others saying they haven't had one for years w/no issues.
If it turns out that you need a tach filter, PM me and I can give you more info on replacement options.
Now as far as the 73, I don't have any first hand knowledge but of course I'd first check the cable and then I have read where there is a right angle adapter, at the distributor I believe, that often strips it gears. I'm sure someone w/first hand knowledge will jump in here soon and clairfy and/or add to this.
Welcome and good luck to you both.
The issue w/the 76 may be the tach board itself, but could also be the tach filter. This device is there to prevent electrical spikes from damaging the tach circuit board. It is located inline w/the wire coming from the distributor and going to the tach. On my 75 it is bolted to one of the rear bolts on the top drivers side of the intake manifold. It's a tubular can and can be tested by simply removing both the input and output wires and connecting them together. If this helps I'd suggest you don't leave it this way as it could end up damaging your tach. However I'm sure you will get responses from others saying they haven't had one for years w/no issues.
If it turns out that you need a tach filter, PM me and I can give you more info on replacement options.
Now as far as the 73, I don't have any first hand knowledge but of course I'd first check the cable and then I have read where there is a right angle adapter, at the distributor I believe, that often strips it gears. I'm sure someone w/first hand knowledge will jump in here soon and clairfy and/or add to this.
Welcome and good luck to you both.
Last edited by ACECO; Mar 24, 2005 at 01:49 PM.
Racer
Joined: Mar 2005
Posts: 445
Likes: 0
From: SAN DIEGO(SANTEE) CA.
Thanks for the reply on the 73. mine doesn"t have a right angle at the dist. it has the msd eletronic dist. that was there when i bought it. The tach goes right into the base of the dist, maybe the guy that put it in did it wrong. lot of other things he just put together with chewing gum. I don't mind it though, i love working on it and got the price that i wanted, so i can't complain.
't
't
Team Owner
Joined: Apr 2001
Posts: 54,204
Likes: 180
From: S.W. Ohio. . . . . . NRA Life Member
I repair and calibrate electronic tachs - as well as convert mechanical to electronic.
email me if interested:
tim-yvonne@juno.com
email me if interested:
tim-yvonne@juno.com
