[GreenKeys] KS-7470

Sat Jun 13 03:37:15 EDT 2015

I think its vegetable based oils that clog. When I was (much) younger I used
to pick people up who had fallen off in Motorcycle Road Races. Many bikes
were run on a Castor oil called "Castrol R" and that definitely gummed when
it met traditional. It appears to be no longer made, but this version of the
Castrol Classic oils page from the internet archive contains a clear warning
not to mix it with anything else...

http://web.archive.org/web/20140821002321/http://www.castrol.com/en_gb/unite
d-kingdom/products/cars/classic-oils/classic-engine-oils.html

It also had a very distinctive odour, fondly remembered by those of us who
visited the UK tracks in that era...

Dave

> -----Original Message-----
> From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf
> Of Richard Knoppow
> Sent: 13 June 2015 00:51
> To: Bob Camp
> Cc: greenkeys at mailman.qth.net
> Subject: Re: [GreenKeys] KS-7470
> 
>      When I did the searching around for a modern equivalent of the grease
> recommended by Collins Radio I found a couple of articles stating that
some
> air crashes were due to the mixing of synthetic grease with
> petroleum grease in control gears.   However, a google search about
> mixing oils produced the following:
> 
> http://chemistry.about.com/od/geochemistry/f/What-Happens-If-You-Mix-
> Regular-And-Synthetic-Oil.htm
> 
> http://www.valvoline.com/faqs/motor-oil/full-synthetic-motor-oil/
> 
> https://answers.yahoo.com/question/index?qid=20080522152013AAuT6nh
> 
> http://harleytechtalk.org/htt/index.php?topic=7000.0
> 
>       Now, all these say its OK to mix the two types, however this is for
OIL.
> When I looked for grease compatibility things were not so clear, for
instance:
> 
> http://www.machinerylubrication.com/Read/882/mixing-greases
> 
>       I think the difference is that greases have a carrier to hold the
oil.  They
> are meant to be used where plain oil will not be distributed properly or
will
> run off a surface so they are composed of oil in a carrier.  The carriers
may
> not be compatible so its not so simple as with oil.
> 
> 
> On 6/12/2015 4:09 PM, Bob Camp wrote:
> > Hi
> >
> > Probably worth adding:
> >
> > Mixing synthetics with petroleum based products can be (but is not
always)
> a problem. Best to try a bit of whatever and see what happens. Watch for
> separation of the two products.  Also, in extreme cases, watch for
gumming.
> >
> > Bob
> >
> >> On Jun 12, 2015, at 6:10 PM, Richard Knoppow
> <1oldlens1 at ix.netcom.com> wrote:
> >>
> >>     Two possibilities:  One is Microil made by Kano Labs and described
as
> instrument oil.  See their web site for details. Also, most oil companies
make
> "R&O Turbine Oil"   R&O means it has additives to prevent rust and
oxidation.
> Turbine oil is recommended as a general purpose fine machinery oil,
> especially for electric motor bearings.  It needs agitation from the
bearing so
> is not a substitute for grease.  There are a number of synthetic greases
made
> for aircraft use under names like Aeroshell No.7.  A grease with similiar
specs
> is specified by Collins Radio for the cams and gear train in the R-390A.
There
> are also fine synthetic (silocone based) oils and greases available at
hobby
> shops that specialize in model trains.   These do not gum up with age but
may
> not be as good as lubricants as highly refined petroleum based oils like
Microil
> or the turbine oils.   Turbine oils are usually specified with ISO
numbers.
> No.46 is about equal in viscosity to SAE 20 weight.  N
>  ormally, these are sold in 55 gallon drums but are also available in
small
> amounts with some searching.  One source says Grainger carries it.
> >>
> >> On 6/12/2015 11:24 AM, Jim Haynes wrote:
> >>> Speaking of gumminess, we know that KS-7470 is not really good
> >>> around the plastic tubing that was used in Model 28s to enclose the
wire
> bundles.
> >>> They get noticeably sticky.
> >>>
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> >> --
> >> Richard Knoppow
> >> 1oldlens1 at ix.netcom.com
> >> WB6KBL
> >>
> >>
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> 
> --
> Richard Knoppow
> 1oldlens1 at ix.netcom.com
> WB6KBL
> 
> 
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