Date: Sat, 10 Jul 2004 09:11:29 +0100 From: Grunff <grunffnospam.com> Subject: Re: Question about CV joints
Studecom wrote: > Hello again Saab experts! My '90 900 non-turbo is starting to make clunking > sounds from the front axle when I make hard turns. I'm guessing this is the > outer CV joints. The car has about 75,000 miles. This is a very young age and low mileage for CV joints to fail, unless they've been running dry. First do a visual check of the boots. How do they look? Are they split? Second find a nice level bit of ground, and drive around in slow circles with steering at full lock, first clockwise then anti-clockwise. If a CV joint is failing, you will hear a steady clicking/knocking coming from that joint. > My question is whether I need > to replace both the inner and outer CV joints to fix the problem. The answer is that you first need to identify the problem. There are in fact no inner CV joints - they are spider/cup drives, which are quite different with totally different failure modes. CV joints are very tough things, and when one fails it's almost always because it's been run dry. Sometimes the ball cage will just fail, but this is rare. Because of this, you normally just replace the failed joint. If it has failed because the boot has split, it's wise to replace all 4 boots at the same time. > What's the > standard remedy for bad CV joints on these cars? Some shops I've talked to > have mentioned rebuilt axle assemblies, is this the usual way to go? Replacing a CV joint on a C900 is pretty easy, with no special tools/equipment required. As such, you would usually just buy a replacement CV joint. -- Grunff
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