Diagnosing a bad crystal? Need ideas on helping me and others.

As I hooked up my Frequency counter to another radio from a Buddy of mine, the radios frequency is bouncing all over the place. Radio has no receive and no transmit, of course, it is off freq. I am not sure about diagnosing this radio, as I cannot get this to lock on Transmit freq, bouncing from 8.000 to 50.000 Megahertz, and will not stop when adjusting the pots that has the 2 half settings, this one wont stop, just jumps all over the place.
What would be the proper way to diagnose a...

Diagnosing a bad crystal? Need ideas on helping me and others.