Date: Fri, 27 Jun 2003 21:12:28 -0400 From: ma_twain <ma_twainnopsamo.com> Subject: Re: Good Snow Tires for Saab 9-5 Aero?
Goran Larsson wrote: > In article <bdhegd$jsa$1nopsam.atl.mindspring.net>, > J. Harris <insectoatmindspring.com> wrote: > > >>On a related note, earlier this year Saab USA issued a RECALL/service-notice >>for 9-5 owners that alternate between alloy and steel rims. Seems there's >>some sort of corrosion-risk or stem-breakage concern. >> > > If the surface between the wheel hub and rim is not cleaned (as it should > be) then the corrosion/salt deposits/sand/junk/whatever could result in > the wheel hub and rim surfaces not being parallel. The result of this is > bending forces on the screw when the threaded part follow the wheel hub > and the conical part follows the conical hole in the alloy rim. The > garbage can accumulate during winter because the alloy and steel rims > have different sizes on the area that rests against the wheel hub. > The bending forces on the screw can weaken the screw and have in some > cases resulted in broken screws. > > >> A no-charge "fix" >>should be available at your dealer. >> > > The fix is a new set of wheel screws. The difference is that the conical > part of the new screw is free to move. A picture on my homepage > > < http://www.nospam.com/saab/hjulskruvar.jpg > > > shows the old wheel screw as #2 from the left, new wheel screw as #3 > (conical part close to head) and #4 (conical part close to threads). > Screw #1 is a third party wheel screw with the same dimensions as > the Saab wheel screws. > > If correct wheel change procedures are followed (clean area, torque > screws in a star pattern, use correct torque) the old wheel screws > should be perfectly fine (and Saab does not replace them on the Aero > as the Aero can not use the 15" steel rims due to the large brakes). > If you alternate between alloy and steel rims and don't follow the > correct procedures (or are not sure that the workshop follows the > correct procedures) then the new wheel screws will remove one possible > problem. > > I suppose it depends what you do when you change tires. I take advantage of the tire change to inspect the brakes, suspension and CV joint boot. It only takes a few seconds to clean and inspect a lug screw and apply a drop of oil. The torque specs given are for clean, lightly oiled threads - not damaged, dirty or dry threads.