flexi Reader
9/24/16 2:48 p.m.

Any tips to remove RTV from surfaces and inside threads? Attempting to seal up the bottom end of a miata block. (RMS, oil pump, oil pan, etc.) Is there a solvent that works? Reluctant to use HF taps since they don't seem to use the same standards as everyone else.

fasted58 UltimaDork
9/24/16 3:29 p.m.

besides a good tap, a rifle bore brush, compressed air and brake clean or all of the above.

flexi Reader
9/24/16 3:33 p.m.

Good idea on the bore brush! Wasn't sure what solvent would work. I'll try the brake kleen, and the bore brush. Thanks.

44Dwarf UltraDork
9/24/16 8:45 p.m.

mineral spirits will soften and swell RTV. then a rifle bush will clean the hole.

curtis73 GRM+ Memberand PowerDork
9/25/16 8:06 p.m.

I use a thread chaser and air gun. Don't use a tap; its a different animal. It will cut more metal. Just use a chaser.

Knurled MegaDork
9/26/16 6:14 a.m.

Razor blade to get the thick stuff, kerosene or carb cleaner and a wire brush to get the major bits off of the sealing surfaces and carb cleaner and a Scotch-Brite pad to get it really clean and carb or brake cleaner on a paper towel to get it clean enough to seal.

I never really worry about the threads.

motomoron SuperDork
9/27/16 2:22 p.m.

Cured RTV silicone isn't actually dissolved by much. Maybe methylene chloride, Permatex and Loctite both sell Silicone solvents, but they're way toxic and expensive.

I use a variety of scrapers, steel and brass scratch brushes, and chasers. I find the stiffer, straighter and sharper the scraper, the less likely it is to put scratches in the sealing surface. So I keep a high speed steel lathe cut-off blade around. It works great.

Knurled MegaDork
9/27/16 4:50 p.m.

Yah, dissolving the sealant isn't the goal so much as separating it from the metal. This is aided by a solvent and mechanical removal (scrapers/wire brushes/Scotch-Brite pads, the ones you hold in your hand not the Rolocs!)

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