The International Cessna^® 170 Association

Just install it, Miles. It's a TCM way to identify the spring and it's tension. Later on, when someone wonders which spring you installed...they'll see that it's blue and they'll know and feel better.
J & J Airparts is a good company, been in business a long time (nearby San Antonio) and have a good reputation. You can order all cylinder parts directly from them. They also sell TCM and Superior. http://jjairparts.com/custin.html

Miles

Stepping back to the Loctitie 515 the TCM SIB says to use with the Permatex D on the case half flanges.

First did you use the Loctite brand. I have been told that Loctite sold to Permatex and Permatex has the full line of Loctite products. But for some reason Loctite (the brand) still exists and is a different company.

In any case did you use activator with the 515. Looking at the Loctite technical sheet it doesn't look like the activator will do any better than without since 515 fully cures in 72 hours either way. Of course the activator is more $$ so I'm looking to save $$.

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Thanks Miles but it's just as easy and faster to find the primer around here. I took note after my post that the SIB calls for a primer on the noes seal area and not elsewhere.

As for the curing from my reading it seems 515 cures in the absence of air. Don't know why it doesn't cure in the tube but it may be the contact with metal or pressure. Your are right the cured strengh is less between aluminum then it is between metal.

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You guys are not going to believe this but, ...way back in "Q-7" (one of my brains memory-banks that wasn't completely destroyed in my late 20's...) ... I have a recollection that some "anaerobic" adhesives exist, one of them being certain types of "Loctite", ... that will only cure in the absence of oxygen. So,...one wonders,.... why does it not turn solid in it's bottle? Because that bottle is a special porous plastic that allows air to "breathe" thru the sidewalls....yet has such small pores that it does not allow liquid adhesive to escape.
Only by applying the adhesive to the object, and clamping/assembling the object, is the air/oxygen deprived of the product ...and thereby allowing it to "cure". (OK....back to "coast" mode now, Q-7.)

George you may be right. I've had time to research the differences in Loctite brand and Permatex brand 515. I've read the tech sheets and it says the product much be stored in a PARTIALLY fill container presumable so the O2 in the remainder would keep it from curing.

In any case I've found that Loctite which is now owned by Henkel, bought and at one time owned Permatex but the Permatex brand has since been sold off. From looking at things such as the MSDS sheets you can find the name Henkel, Locktite and Permatex all associated with a product 515 or 51531 which is the full product number for Loctite. It would seem that Loctite and Permatex are the same product. Apparently since the break off of Permatex the Permatex product numbers are changing but the product is not so some cross referencing may be in order if you are looking for a Loctite product and can only find Permatex.

FYI will searching the web for info on Loctite 515 low and be hold I found out that TCM isn't alone using the two product combination of Loctite 515 and Permatex D plus silk thread to seal case halves. Lycoming also makes this recommendation.

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I always paint battery boxes with polyurethane paint, like Imron or primer. once cured it is pretty acid-proof. great way to use up spare amounts in the cabinet, some of our airplanes have very pretty yellow and orange battery boxes

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Milestone. Miles' stone. Is that a particular pitch or just a heavy weight? When it's flying again, will it no longer be a stone? Will that engine sound like music? A deep throaty pitch? (Is it late yet? Do I need another beer? Probably not.)

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cessna170bdriver wrote:I gave up on finding "acid-proof" paint and sprayed the inside of the box and the rectangle on the firewall behind the box with spray can undercoating.

Miles, I know it is to late now but for future reference:
http://www.aircraftspruce.com/catalog/c ... fpaint.php

Baking soda in battery box? To neutralize any acids that come out of the battery? Is this a common practice?

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