Quote:
Let the ride decide wrote:
James,
What is the purpose of the epoxy on the face and edge?
It also looks like the orange wire, last one on the right has gotten hot, and melting the covering, or is that just grease?
The epoxy is used to bridge that gap between the two sections and inhibit the selector pointer from getting hung up.
when the finger comes to the gap and disconnects there is a spark. This spark erodes the phenolic(the redish/brown insulator held on by rivets) behind the sector contacts and a deeper and deeper gap, eventually a finger falls so far in to the gap that it cannot come out of the gap, thus the finger bends and/or the segment cracks.
The epoxy, modern material fills in the gap and will not erode from the spark. The two contacts on the segment often become misaligned from loosening rivets. Rivets MUST be tightened or problem will reoccur.
Best to tighten then re-arc contacts so they are even.
Thanks
James
This Post was from: https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=145874