Dumb luck fix for shake (long) - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Dumb luck fix for shake (long)
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Posted by SPG Jr [Email] (#1830) [Profile/Gallery] (more from SPG Jr) on Tue, 6 Jun 2017 09:21:07 Share Post by Email
In Reply to: Shimmy shimmy ya shimmy ya shimmy yea, EM, Mon, 1 May 2017 18:19:25
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This thread may be inactive but thought I'd share for future searches my dumb luck with a similar condition on my 125k 00 Viggen. In my case the shimmy came on at 50-55. Been dealing with it since acquiring about a year ago.

I had front of the car up on jack stands, wheels off to put some PB Blast on the outer tie rod ends. To remount wheels I had always hand inserted and tightened the wheel bolts, then tighten with a socket wrench, lower the car and tighten bolts to spec torque. On a whim I used my household impact driver for the pre-tightening while the car was on stands, then lowered car and tightened as normal. (Mind you, not a proper pneumatic wrench. Driver gets to maybe 40-50 ft lbs tops.)

Lo and behold, on the very next drive, shimmy gone. Nothing else was done besides the PB spray. Replaced the tie rod assemblies a day or two later, using the impact driver again, same result, no shimmy.

A couple weeks before this work I had the tires replaced by my indy, and presumably they would tighten the bolts to 81 with all four wheels off the ground. The shake predated the tire change and was present with the new tires. I have no good explanation for why this seems to have worked. I had the car up to 100mph after doing the tie rods, no shake.

Other variables involved are Eibach springs, Koni adjustables, 320mm rotors and big Brembo calipers, Ronal LV 17 x 8s with 5mm spacers, all installed by previous owner. The spacer set up was suspected as the shake culprit by a wheel/tire shop that was going to road force balance. They didn't even bother balancing though, instead first directing me to a source for custom machined spacers. So as far as I can tell the impact driver pre-tightening seems to have smoothed my ride. Go figure.

->Posting last edited on Tue, 6 Jun 2017 16:51:45.


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