Date: Fri, 30 Jun 2006 21:36:58 GMT From: "Nightmare" <nightmarenospamu> Subject: Re: 9000 Drivetrain noise . . . help!
Might be the driveshaft test it by drive approximately 25 mph in a wide circle test one direction first then the other and it's a great help if you are two when performing this one drives the other listen,and it needs a large preferly empty space,when testing this steer as snug you can cause the harder the louder the noice will be. Be precausious when performing this Driveshaft is a common problem on SAAB especially the 900 models but even on the 9000 series it occures. I have a friend who owned a1989 9000 a couple of years ago and we did this test when he got those weird noices. Hope this was for some help Regards Nightmare "Charles Molhoek" <molhoeknospaml.com> skrev i meddelandet news:8c48a2pn4f7pmanr061mdm99gbg8b9ei95nospamcom... > Ok, please tell me someone knows what is going on here! > > I have a '97 9000 Aero with 200k miles. Recently (about 300 miles ago) > developed a weird metallic knock in the left front drive train (it > actually sounds like the 'click' from a torque wrench, just 20 times > louder). It occurs when I accelerate and also when I let off the > accelerator. The more gently I accelerate, or decelerate, the softer > the noise. If I disengage the clutch before decel, I don't hear it. > The noise sounds like a light clunk in the cabin with the windows up, > but with the left window down, it's up to full volume. You can not > hear much from the right window, so it's definitely on the left side. > The weird, and disturbing, point is that it came on very suddenly, I > did not notice it building at all. > > Listed (far) below are the steps I have taken to isolate the problem > (so you can skip over as much of my OCD babble as possible). Being the > cynic I am, I have now assumed that the problem has maximum PITA > potential. There seems to be an abnormal amount of play (in terms of > how many degrees you can rotate the wheel) in the transmission when > rotating the left wheel back and forth (tranny in gear, right wheel on > the ground). In addition, it sounds a little loud the differential > housing when I rotate the wheel. It's much less noticeable if the > tranny is in neutral and you can freely spin the left wheel, but it is > still there. My thought is there is some slop in the gearing in the > final end of the trans, and the application of power, and also the > compression braking of the engine during decel, are making two gears > slap together over some excessive play, but I have no idea where! > > If anybody has any experience with this problem, or even any advice on > what to do next (other than going to a mechanic, transmission shop, or > the local theivin' Saab dealer), I would greatly appreciate it. > > Thanks, > Charlie > > > > What I have determined thus far: > > The caliper is firmly in place and the pads show no problems (~60% > thickness). The rotor retaining screw and wheel locating stud are snug > and there is no play in the rotor/spindle mounting. > > The ball joint is tight and shows no signs of problems. The steering > rack and links are tight and visibly fine. > > The inboard universal joint on the left side appears to be OK. The > rollers and their needles seem to be fine and the drive cup shows no > abnormal wear spots. > > The outer CV new, but I checked it anyway. There appears to be no > slack and it moves smoothly. It is a OEM replacement (Lobro, not > ScanTech) that has about 2 years and 30k miles on it, so it should be > fine. > > The wheel bearing was shot, but it was replaced before this came up, > so that should not be an issue. Just to be paranoid (a frequent > problem of mine, you may notice), I swapped out the new bearing for an > old one I had. The knock was still there, it was just harder to hear > over the noise of a bad bearing. After returning the new bearing to > it's proper place (with a new axle nut), the noise remained the same. > > The struts are new and their bearing pads seem fine. All mounting > bolts are snug. > > Upper motor mounts, lower tranny mount and front lower hydraulic motor > mounts are all new and snug, no issues there. The rear hydraulic mount > appears to be fine as well. > > Exhaust does not seem to be knocking on anything.
