Learning from an owner annual

Private wrote:
"Jim Macklin" wrote in message
news:EZF9g.20244$ZW3.18025@dukeread04...
I've heard of owners replacing the standard fasteners with
nice shiny stainless steel screws. Trouble is you can get
dissimilar metal galvanic reactions and then you have to
drill them out.


I am aware of galvanic corrosion, which often corrodes aluminum when it is
in contact with steel, especially if in the presence of moisture and even
more especially moisture with salt. The use of stainless fasteners should
AFAIK greatly reduce corrosion of the fasteners but am unaware of any change
to the galvanic corrosion rates on the aluminum. Are you suggesting an
increase in galvanic action between a stainless fastener and a plain steel
nut? Please expand.

What I have heard is this. If you use a carbon steel screw in the
aluminum structure, the corrosion occurs on the steel screw (rusted
screws). To correct the problem, you just replace the screws. If you
use stainless screws, this changes the galvanic status of the
connection to where the aluminum becomes the metal that corrodes. This
means that if you allow corrosion to occur, the aluminum structure
around the screw is what corrodes instead of the screw. To correct this
situation, you have the aluminum structure around the screw to replace,
which is much more involved and expensive than just replacing the
screws.

I would also appreciate comment on the use of thread lubricants like
'Nevr-Seize' which IMHO allow increased clamping force and also greatly
reduce thread seizing from corrosion.

Use of a good corrosion preventative like corrosion X or ACF-50 should
prevent any corrosion of the structure, if you keep it applied every
annual.

"RST Engineering" wrote in message .. .
I don't mind setting it up and writing it, but I'd prefer it not be a subset of the RST webpage (i.e.
www.rstengineering.com/ownerannual or something like that). How can we do this on the cheap, whether it be a
standalone or a subset of some other website?

Jim




Maybe Jay's folks could sponsor it?

"Private" wrote in message
news:yu2ag.165036$7a.147100@pd7tw1no...

"Jim Macklin" wrote in message
news:EZF9g.20244$ZW3.18025@dukeread04...
I've heard of owners replacing the standard fasteners with
nice shiny stainless steel screws. Trouble is you can get
dissimilar metal galvanic reactions and then you have to
drill them out.


I am aware of galvanic corrosion, which often corrodes aluminum when it is
in contact with steel, especially if in the presence of moisture and even
more especially moisture with salt. The use of stainless fasteners should
AFAIK greatly reduce corrosion of the fasteners but am unaware of any
change to the galvanic corrosion rates on the aluminum. Are you
suggesting an increase in galvanic action between a stainless fastener and
a plain steel nut? Please expand.

I would also appreciate comment on the use of thread lubricants like
'Nevr-Seize' which IMHO allow increased clamping force and also greatly
reduce thread seizing from corrosion.

All it takes for corrosion to begin is two dissimilar metals and a bit of
dirty moisture (obtainable free from polution and humidity). Even two
pieces aluminum of different alloys can cause corrosion. AC43-13, which
every owner should have a copy of, has an excellent section on corrosion.

Also, isn't the DC motor sparks thrown around inside a power screw driver a bit of a safety hazard?


wrote in message oups.com...
You know what? I've been through this one so many times, but it's been

"Jim Macklin" wrote in message news:_9S9g.20789$ZW3.7907@dukeread04...
New fasteners are cheaper than the labor to inspect and
clean old fasteners.




--
James H. Macklin
ATP,CFI,A&P



I don't know...I come pretty cheap! ;-)

(".Blueskies." wrote)
Maybe Jay's folks could sponsor it?


Jay needs to consider (somehow) separating that enormously popular video
page of his ...from the Inn's $$$ making page.

"The server is down" (whatever the message is) --- more than once in a while
these days.


Montblack
...maybe it's only on my end?

That's one reason shops use pneumatic drills and grinders.



".Blueskies." wrote in
message
. com...
| Also, isn't the DC motor sparks thrown around inside a
power screw driver a bit of a safety hazard?
|
|
| wrote in message
oups.com...
| You know what? I've been through this one so many times,
but it's been
|
|

I find never-seize on threads to work magic minimizing corrosion, but
one has to be very careful not to get it on the phillips head or the
phillips driver. Even traces of it (or paint) make the drivers cam
out. Buy lots of spare screws and drive bits. Use solvent on the
drivers and the screw heads.

It doesn't help that those damn AN structural screws (can't remember
the number) are so soft and the phillips socket so shallow that the
heads strip out much easier than those unapproved pan head stainless
fasteners. I don't know what they offer except of course a full
diameter shank and a lot of ductility.

Some of you must live in a very corrosive environment though.

I use a pattern maker scribe to clean out the slots. Works the best, I found
yet.

On Sun, 14 May 2006 21:28:13 -0500, "Jim Macklin"
wrote:

If the screws have paint in the slot, clean it out before
you try to unscrew the fastener.

--
James H. Macklin
ATP,CFI,A&P

GeorgeC

Jay needs to consider (somehow) separating that enormously popular video
page of his ...from the Inn's $$$ making page.

"The server is down" (whatever the message is) --- more than once in a while
these days.

That problem was an unfortunate side-effect of Jav's heroic attempt to
upgrade his server. (Of course, it wouldn't have NEEDED to be upgraded,
if not for our video page. That thing is sucking up a lot of
bandwidth, but Jav never blinks. He just keeps saying "Bring it
on!"... :-)

When his new, bigger, faster hard drives didn't play nice with his new,
faster mother boards, everything when phhhhhhhhtttttt. Thankfully,
all is well now -- and it's LIGHTNING fast, compared to the old system.

--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"