lml@lancaironline.net Mailing List Archive

<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> > Has anyone evolved a full proof method of changing a tire without pinching > > the inner tube as the wheel halves are bolted back together? > Byron - [The following is taken from my article on pinched tubes in the October/November 1998 LNN]... As a result of a pinched nose wheel tube, I called Don Goetz and his recommendation was to use cardboard as a liner on the rim to prevent pinching. I removed and disassembled all three wheels and tried the cardboard technique in a trial fashion. It would have to be very stiff cardboard and even then, there appeared to be a good chance that the cardboard would snag or crumple upon reassembly and that could not be seen or detected. So, I developed my own technique which works 100% and is verifiable: 1. Throw away the cardboard, you don't need it! 2. Using plenty of talc in the tire, insert the tube and inflate it just enough that it contacts the tire walls. Make any adjustments to properly position it and then trial fit the rim half with the valve stem index. 3. Remove the rim half and inflate the tube a little more to expand the tire side walls an additional 1/4 - 3/8 inch each. This will stiffen the tube so that the edges of the rims will slide over the tube with less tendency to bite and pinch. To ensure that no biting or pinching occurs, spread a liberal amount of silicon lubricant on the tube inner radius, where the rim edges will slide. Also spread a thin film on the rim edges themselves (a thick, gooey silicon lubricant is best). Be careful not to spread any lubricant on the tire or rim bead surface. 4. The additional inflation in step #3 will make it a little difficult to bring the rim halves sufficiently together to start the nuts on the bolts; however, by laying the assembly on the floor, with the bottom rim half supported by a short length of 1" x 1" wood to space the tire off the floor. Then use a 2' or 3' length of 1" x 1" on top (spaced off the tire wall) to press the rim halves together and start the nuts. Use an inspection mirror and flashlight to verify the tube is not pinched (because of the silicon, it won't be!) Bill Rumburg N403WR (Sonic bOOm) >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>