Need help with tach/cable
Thread Starter
Burning Brakes
Joined: Sep 2002
Posts: 767
Likes: 160
From: Central Florida
Need help with tach/cable
1972 base coupe, stock 350 with TH400.
When I start the car after sitting overnight the tach works perfect, warm it up a bit, drive it and in about 10min. tach starts bouncing and then goes to 0.
Won't work again but if I again leave it overnight the scenario repeats!!
1. Don't think the cable's broken because it does
work properly although intermittently.
2. Could it be cable lub related?
3. Could it be the distributor's gear/fitting?
4. Could it be the cable's end fittings at either end?
Troubleshooting, ideas, suggestions much appreciated. Thanks, Lou
When I start the car after sitting overnight the tach works perfect, warm it up a bit, drive it and in about 10min. tach starts bouncing and then goes to 0.
Won't work again but if I again leave it overnight the scenario repeats!!
1. Don't think the cable's broken because it does
work properly although intermittently.
2. Could it be cable lub related?
3. Could it be the distributor's gear/fitting?
4. Could it be the cable's end fittings at either end?
Troubleshooting, ideas, suggestions much appreciated. Thanks, Lou
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
My 71 did exactly that. Very end of inner cable (aka core) was worn round ... supposed to be square where it fits into dist gear.
You dist gears (either or both shaft & cross) may also be worn out/stripped.
Unless you're a lithe, teenage gymnast ... Do yourself a favor ... if you dive under dash to get to tach/speedo ... FIRST go ahead & remove driver seat ... it'll pay dividends.
You dist gears (either or both shaft & cross) may also be worn out/stripped.
Unless you're a lithe, teenage gymnast ... Do yourself a favor ... if you dive under dash to get to tach/speedo ... FIRST go ahead & remove driver seat ... it'll pay dividends.
Melting Slicks
Joined: Sep 2006
Posts: 2,806
Likes: 468
From: Wichita Kansas
My 71 did exactly that. Very end of inner cable (aka core) was worn round ... supposed to be square where it fits into dist gear.
You dist gears (either or both shaft & cross) may also be worn out/stripped.
Unless you're a lithe, teenage gymnast ... Do yourself a favor ... if you dive under dash to get to tach/speedo ... FIRST go ahead & remove driver seat ... it'll pay dividends.
You dist gears (either or both shaft & cross) may also be worn out/stripped.
Unless you're a lithe, teenage gymnast ... Do yourself a favor ... if you dive under dash to get to tach/speedo ... FIRST go ahead & remove driver seat ... it'll pay dividends.
Le Mans Master
Joined: May 2007
Posts: 5,007
Likes: 1,115
From: North tonawanda NY
I was able to remove my tach cable on my 74 without removing my interior and replace it in about 10 minutes... I did not get so lucky myself with the brake booster though.. that job was a PITA...
Thread Starter
Burning Brakes
Joined: Sep 2002
Posts: 767
Likes: 160
From: Central Florida
Thanks for the info guys!
I'll definitively ck. the cable itself, the connection end & lub, what threw me off was this happening intermittently, i know its a mechanical tach but it was acting like what you'd expect with a failing electrical part or connection.
Anyway, not looking forward to replacing the cable, 65 and very, very, I say very far from svelte & flexible!! Lol!!
I'll definitively ck. the cable itself, the connection end & lub, what threw me off was this happening intermittently, i know its a mechanical tach but it was acting like what you'd expect with a failing electrical part or connection.
Anyway, not looking forward to replacing the cable, 65 and very, very, I say very far from svelte & flexible!! Lol!!
Last edited by ZyberMunster; Jul 23, 2019 at 08:02 PM.
