Tach cable grease

[RobertGary1]

Been using white lithium grease but seem to still have some wiggle. Should I use something thicker? People say speedo cable grease but never found that.  

Cable ends don’t look rounded. 

[PT20J]

I believe speedometer cable lube is graphite in light oil. It should be available at auto parts stores. I might try removing the cable core, cleaning it in solvent and then lubricating it with speedometer cable lube. Might also be the gauge is just wearing out. I would also get an optical tach and check the accuracy of the gauge.

[RobertGary1]

2 hours ago, PT20J said:

I believe speedometer cable lube is graphite in light oil. It should be available at auto parts stores. I might try removing the cable core, cleaning it in solvent and then lubricating it with speedometer cable lube. Might also be the gauge is just wearing out. I would also get an optical tach and check the accuracy of the gauge.

I ran the gauge with a drill and it was smooth. 

 

-Robert

[carusoam]

My M20C got the cable replaced after a few decades…

It was sooo… worn out it had a speed oscillation appear in the tach itself… until it popped the needle off its post.

Sent the tach in for service… they put the needle back on and sent the gauge back….   (no charge)

Replaced the cable…

If you go this route… know that the cable length is defined by Mooney… Aircraft Spruce may have one too long or too short by a few inches….

PP thoughts only…

Best regards,

-a-