[ARC5] R23 repair, dynamotor mounts, questions...

[Brian]

Hello Ken et al,

Not all dyno shocks simply unscrewed. I have met some where there were nuts 
under the chassis and some where, once the shock absorber was screwed into 
either the nut or the threaded bush rivetted to the chassis, they were 
pinned or otherwise maimed to prevent easy removal.

Even if you do find shock absorbers, the rubber in them is now probably over 
70 years of age, and very likely perished or glutenised. After stripping out 
the remnant goo, I have fitted a modern silastic grommet over the centre pin 
and glued the outer of the grommet to the threaded outer shell. But you need 
to set all four of them all up to the same height.

Yes, on the three bottoming studs. You may want to consider adding a 
grounding strap under two of these bottoming studs; the other end of the 
grounding straps fit under two of the snap slides holding the dyno to the 
shock absorber - this was a late WWII mod to reduce noise from the dyno 
getting into the antenna circuit. Add some Noalox between the bottoming 
stud, the grounding strap and the cleaned chassis before final fastening. 
The OEM grounding straps I have encountered were plated copper about 0.010" 
to 0.015" thick, usually fastened to the rear deck of the chassis with steel 
PK screws - naturally, a corrosion attractant. I suppose toward the end of 
WWII, the life expectancy of a combat plane and crew was known to be about 
three weeks; so, corrosion resistance was not an important design 
consideration.

73 de Brian, VK2GCE

On Wednesday, December 23, 2015 6:06 PM , Ken said:

On 23 Dec 2015 at 3:45, aa9il at sbcglobal.net wrote:

> Hello
> Im working on an R23 receiver that was modified but never finished. 
> "Someone"
> removed the dynamotor mounts

HOW were they removed? They simply un-screw, but many hams in past
"ages" didn't know that, and often destroyed the threaded places in the
chassis when they removed them.

> and the small metal stud that is near the 3 pin
> plug - the plug is still there.

As I remember it, there should be THREE studs near the plug.

> does anyone have 4 of the dynamotor mounts?

Hmmm....I MAY have, but will have to search my pile, and I can't do that 
until
spring at this point.

<snip>
Ken W7EKB