De-rusting R25/2 Tank

[schrader7032]

I actually saw that the other day. I've been to our local store and they usually don't have much in stock. I wonder how many I have to buy! But I'll certainly drop in and check...got to find them again!

[r67boxer]

Kurt, if you use EvapoRust you wont need to worry about the paint. Instead of using the gas cap, I just moved the tank around (flat, left side, right side, standing on its nose) to make sure the EvapoRust soaked the entire tank. Its as easy as soak, drain, rinse. I didnt have to do any work afterwards.

In addition to that Evaporust is non toxic and biodegradable. I've used it for years and swear by it, not at it.

Kevin

[schrader7032]

OK, I think I have the tank inlet taken care of like I wanted. At a local plumber's place, I found an item which is a 3-inch coupler...it's the two pieces on the left. The rubber part fits inside the clamp on the left. I ended up cutting one side of the coupler rubber off and trimming a bit so that it fits down over the lip on the tank...the lip is a little less than 0.5-inches tall. This "o-ring" fits pretty well and takes up the slack so that I can slip the flexible end cap for a 3-inch pipe, which I discovered had an ID greater than 3-inch. It fits over the o-ring nicely and then I can clamp down using the hose clamp. It seems to want to stay on. I even blew air into the tank outlet and it seemed to hold air. Now if I can get the crusty gas stuff out of my mouth!

The last thing I want is the M16x1 nut. I've called/visited every place I can think of. I will eventually try order a couple of them from Fastenal.

[Jim D 5112]

Just find an old petcock and use the open nut off of it. Solder a piece of metal over the one open side that does not thread onto the tank. Cut a coin like disc out of a thick piece of rubber that will fit down into the nut and bottom out against the disc that you soldered on. Just tighten it up on to the tank fitting.

[schrader7032]

That's what I hope to do. But I don't have an old petcock that I can sacrifice the nut on.

[schrader7032]

I even tried going to the local BMW car place...not help there. But I had seen this online...a temporary drain plug nominally 0.5" in diameter...maybe a little less. But the screw head and the rubber were slightly too big to fit. So I spent some time with a drill press filing down the screw head and the rubber stopper. Fits nicely!!