Tried the bench, no luck. Is it best to seal an Original Hood Tach with silicone, everywhere air can get in, or should I vent it? I don't want to see the lenz fog up. What is everyone doing (using the repro's)?o No: I'm thinking I may try to seal it up as air tight as I can.
Dan, I may be wrong so you may want to check this out. I've heard that the fumes from too much silicone can wreak havoc on printed circuit boards and soldered connections. Thats what I have heard anyway. Even tho its repro they still are pretty expensive. Lou
Thanks Lou but I'm sure there is no way silicone (or fumes) will corrode metals or circuit bourds (it ain't an acid).:Brow: I could see units that have been siliconed, but continued to let in a very small amount of water, would corrode MUCH faster because the water vapor would essentially be traped and create a very humid atmosphere, where the water evaporates and then condensates over, and over.... I also coated all the connections with an oxide inhibitor, so if that cycle begins within my tach, the moisture will NOT corrode the tin plated copperl connections. This may be MORE important than sealing the tach body.:Smarty:
I would tend to think that silicone will not harm any electronic boards or anything. I would be more worried about sealing a littel bit of water in there that would ruin the circuits instead like you mentioned
I've never seen the inside of a hood tach before, but... Is there enough room for one or two of those "Silica" packs that you see in shoe cases in there. Arn't they supposed to draw the moisture out of the air. If there is, I'd throw one in there... then seal it up real good so no more moisture gets in there. Just a thought, with nothing to go off of... I'll understand if it sounds completly lame...lol.o No:
Dan, Silicone sealer releases aceitic acid as it cures. Don't know whether that would corrode anything. In any case, unless you could evacuate the tach housing, there would be air inside, which would contain some moisture. From temperature changes, it would condense inside anyway. Don't know if there is an answer to to this.
The repros I have had need tend to show moisture on the inside of lens under certain conditions. They always cleared up after heat was applied by the sun, hairdryer etc.
Thanks guys Jeff, (funny thing) I thought of that too, but the shelf life would never make it worth while.:gt: Larry, I knew as soon as I typed that I should have looked into it. I could possibly pull off creating a vaccume inside, but not likely. I'd have to seal between the strainds of each of the 3 wires in the harness, and then around the outside of them too. ou: No, it seems to me the best way is to seal it up tight, and let it breathe with some holes from below, and protect all the connections from moisture that I can.:gt:
