When to change Zincs in Diesel engine

[JVM225]

You, FW, and Quality Time - access to lathes! I'm envious...

Me too!

 

[techmitch]

If one of the problems is keeping the anode tight in the cap wouldn't an actual chaser be better to use than a tap?

Most thread chasers are tapered at the bottom so they don't clear the threads all the way to the bottom as a "bottoming" tap would.