[Healeys] Followup--- Girling Brake Servo Rebuild
rcobb at earthlink.net
Fri Apr 17 19:16:11 MDT 2015
Michael Salter was kind enough to inform me that the vacuum chest of the
servo is steel rather than aluminum, as I had stated.
So, what follows is Sandstrom's application protocol for steel:
"Application on steel. Pre-clean the steel surface with aliphatic
naphtha or any other EPA compliant cleaner that sufficiently
cleans surfaces to pass ASTM F22. Sandblast the surfaces with 180-220
grit aluminum oxide (25-50 RMS optimum). Phosphate
IAW MIL-DTL-16232 (weight should be 11-22 g/m2), type M, class 3 or type
Z, class 3."
Any comments from those who may have used the Sandstrom dry lube
products in the past?
On 4/17/2015 2:04 PM, Michael Salter wrote:
> Hi Bob,
> I'm not sure from your message if you are under the impression that
> the vacuum chest of the Girling servo is made of aluminium. It is
> actually steel if that makes any difference to the application protocol.
> Michael S
> BN1 #174
> On Fri, Apr 17, 2015 at 2:50 PM, R. Cobb <rcobb at earthlink.net
> <mailto:rcobb at earthlink.net>> wrote:
> In anticipation of rebuilding my Girling Servo (I did it
> successfully 30+ years ago), and after reading some archival tips
> (going as far back as the early 1990's), I have ordered the dry
> film lube from Sandstrom.
> Their #26A product has evolved to the current #28A formulation.
> The data sheet for the dry film lube indicates the following
> "Application on aluminum and aluminum alloys. Pre-clean the
> aluminum surface with aliphatic naphtha or any other EPA compliant
> cleaner that sufficiently cleans surfaces to pass ASTM F22.
> Sulfuric acid anodize IAW MIL-A-8625 and seal the surface."
> Sandstrom's tech support director has been out all week at an
> industry conference, so I've not been able to determine if, given
> the application in question, the involved protocol is essential.
> Any input from others who have successfully used this, or its
> predecessor, product, regarding surface preparation?
> By the way, when I spoke with sales and indicated I was interested
> in using their product in relation to the restoration of a vintage
> British auto, the salesperson said, "Oh, an Austin-Healey?"
> Thanks in advance.
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