[Boatanchors] [collins_radios] Re: Lubrication for Collins R-648

[Richard Knoppow]

      Be careful of mixing synthetic oil and petroleum based oils or 
greases. There can be incompatibilities.   Collins recommended a 
synthetic grease for the cams in the R-388.  They gave a mil spec for 
it.  It translates into a type of grease for aircraft such as Aeroshell 
No. 7.
      My experience is that finding authentic information about 
lubrication and lubricants is difficult.
      Most of the oil companies make a line of what is called "turbine 
oil".   This is a highly refined oil originally meant for the high speed 
bearings in turbines but is a very good general purpose oil for electric 
motor bearings, etc.   It comes in various grades which can be 
translated to approximate SAE grades.  It is possible to obtain it in 
small quantities (maybe a quart) from some aircraft service companies.

On 8/17/2015 5:00 AM, 'David Knepper' collinsradio at comcast.net 
[collins_radios] wrote:
> Glen, I concur - the use of a synthetic oil (Mobile 1)  mixed with a bit of
> Marvel oil works "wonder" on all moving parts in Collins radios, etc.
> I believe that Wal-Mart carries both products.
>
> You will have enough for the rest of your life as they say.  Keep the
> mixture it in a plastic bottle.
>
> David Knepper - W3CRA/W3ST
> Collins Radio Association
> www.collinsradio.us
> Join the CRA today
>
> -----Original Message-----
> From: Glenn Little WB4UIV
> Sent: Monday, August 17, 2015 2:09 AM
> To: John Saxon ; Boatanchors Mail List
> Subject: Re: [Boatanchors] Lubrication for Collins R-648
>
> There is a R-390A Y2K manual that is a corrected
> and improved manual based on the last R-390A manual printed.
> There as also a R-390 group.
> The recommendations for the R-390A gear train ( I
> assume the R-648 is similar) is to disassemble
> the gear train, clean the gears, burnish the
> burrs from the gears, reassemble the gears dry
> then lubricate with synthetic oil.
> The bearings would be lubricated with the same oil.
> Some recommend Mobile 1 or similar.
> The reason for this type of lubrication is to
> reduce the caked on grease on the gears anf the
> rebuilt gear train turns very smoothly.
> Some have had to add drag as the tuning racks in
> the R-390A have enough mass to move the gear
> train when properly cleaned and lubricated.
>
>
> Hope this helps.
>
>
> 73
> Glenn
> WB4UIV
>
>
>    At 11:08 PM 8/16/2015, John Saxon via Boatanchors wrote:
>> Hi: I have a R-648 that needs gear lube job. Â I have the manual and it
>> specifies two lubricants: MIL-G-3278 (gear teeth)MIL-L-7870 ( bearings).
>> What would I use for each? Many thanks,JohnK5ENQ
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> ---------------------------------------------------------------------------
> Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
> Amateur Callsign:  WB4UIV            wb4uiv at arrl.net    AMSAT LM 2178
> QTH:  Goose Creek, SC USA (EM92xx)                      SBE ARRL  TAPR
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> of the Amateur that holds the license"
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> ------------------------------------
> Posted by: "David Knepper" <collinsradio at comcast.net>
> ------------------------------------
>
>
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL