[R-390] R-390A Teledyne '63 contract with broken/slipping clamp on 4-8 mhz cam shaft.

[Roger Ruszkowski]

Terry,

It looks as if you will need to do a major disassembly to change that clamp.

The Y2K manual and the gear train drawings in the Y2K manual are the best reference we have.
One of the major points that got the Y2K manual project going was the lack of detail on the gear train.

Think a Saturday 8 hour project with a full RF deck cleaning, relube, mechanical alignment and electrical alignment.
As long as you need to get into it, do it all so you can forget for another yew years.
Pull the RF deck.
A chance to look for black things that need to also be replaced.
It looks like you will need to also pull the front RF deck gear plate.

This stuff is not complicated or real complex.
It just takes forever to get it done.
You spend more time hunting up the best tool to get the fasteners loose and reassembled with.

When reassembling the split gears, do not over reach, just slip the gear pair to tension the springs one tooth. 
You can get two or three teeth on some of the gears. Do not do that. The extra tension just causes the gears to chew on each other.
The split gears do not take enough lash out of the drive train to really matter. When properly meshed, they do run with less mechanical noise.
Gears that are not over loaded also run with less friction, thus less effort to spin the knobs. The split gears do add benefits to the gear train but in 
lots of other ways than to just reduce mechanical lash when changing tuning direction.

Roger AI4NI