----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- Paul,
what I have been doing on my restoration is the walnut shell blast on aluminum and some #30 sand on the steel parts and on some aluminum parts. This removes all corrosion very readily without removing metal. Then all you need to do is apply some alodine and whatever primer you are using and re-assemble. One hint though- stitts poly tak glue will lift zinc chromate primer. Thats why they recommend using the stitts green epoxy primer for surfaces that are going to have poly tak applied to them. I shot both wings with epoxy after I had blasted and alodined. As long as you re-use the same rivet holes you are OK on the jigging Jan Zanutto Fresno, ca 415G On Sat, 12 Aug 2000 12:25:24 -0700 Paul Anton <[EMAIL PROTECTED]> writes: > ----[Please read http://ercoupers.com/disclaimer.htm before following > any advice in this forum.]---- > Has anyone disassembled a rear beam assembly? > > I am getting a set of wings ready for recover. One of the > wings has corrosion in the rear beam assembly. The > corrosion at this time is surface. However, I am finding white > powder between all the riveted seams. > > The rear beam is made up of a large "J" shaped piece that the > ribs are riveted to. This is reinforced with a "U" shaped piece > that > has large lightening holes pressed into it. The corrosion primarily > involves the "U" shaped piece with the lightening holes, and the > seams where it is riveted to the "J" shaped piece. > > I am considering removing the "U" shaped piece in order to treat > all the corrosion. This will soften the structure somewhat. Will it > soften it enough to require jigging the wing???? > > I "THINK" that the wing will be sufficiently stiff due to the fact > that > the ribs will still be attached to the large "J" shaped piece. Also, > since > the "U" shaped piece will be put back using all the original rivet > holes, and misalignment will be removed when this piece is put > back. > > I am also fishing for recommendations for what brand of corrosion > treatment to use upon reassembly. Since the fabric is cemented to > the structure at the rear beam, what ever is used cannot damage the > fabric bond to the structure. > > Unfortunately, this area is one that is not visible until the wing > is > taken apart. In this case, the pitot and static lines exiting the > wing > allowed an opening for mud and moisture to enter. However, there > is nowhere for the moisture to go once it is there and the > corrosion > resulted. A few more years and the rear beam would have been > unserviceable. There are no repair parts listed for the beam, just > the entire assembly for over $900. > > If you have taken this rear beam apart, I would surely like to hear > about your experience. > > Thanks > > Paul > N2273H > > > __________________________________________________ > To unsubscribe from this list please send > mailto:[EMAIL PROTECTED] > ___________________________________________________________ > T O P I C A The Email You Want. http://www.topica.com/t/16 > Newsletters, Tips and Discussions on Your Favorite Topics > --------------------------------- to unsubscribe send mailto:[EMAIL PROTECTED] ___________________________________________________________ T O P I C A The Email You Want. http://www.topica.com/t/16 Newsletters, Tips and Discussions on Your Favorite Topics
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