[R-390] Cleaning Gears & Cams

[Cecil Acuff]

Ultrasonic cleaning is a good way to go if you have one big enough to fit 
something as large as the gear train in.  I wish I did....

I guess it gets the gunk in between the split gears..have you ever pulled a 
pair apart after a cleaning to see what is left between them?

Cecil...
----- Original Message ----- 
From: "tfrobase" <tfrobase at kitparts.com>
To: <r-390 at mailman.qth.net>
Sent: Saturday, November 19, 2005 9:04 AM
Subject: [R-390] Cleaning Gears & Cams


>
> Several years ago, while living in eastern Pennsylvania, I found an
> industrial ultrasonic cleaner at one of my favorite scrap yards.  It has
> become invaluable in the restoration of r-390a's.
>
> I have been fully immersing the detached gear assembly and the inductor
> racks, with the inductors removed.  I use a solution of water based
> degreaser in fairly high concentration.  It takes about 3 - 5 minutes to
> complete the job.  After the ultrasonic cleaning I thoroughly rinse the
> assembly in hot water and dry.  I then apply heavy oil lubrication with a
> hypodermic.  My experience has been excellent, tuning has been smooth as
> silk ... Tom, N3LLL
>
> Take a look http://www.kitparts.com/misc/390-gears.jpg
>
> Thomas L. Frobase, N3LLL
>
>
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