Transmission Noise - Saab 900 Bulletin Board - Saabnet.com
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Transmission Noise
Posted by Donzo [Email] (more from Donzo) on Sat, 18 Oct 2003 10:17:53
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The manual transmission in my 93 900S started making a knocking noise. Sounded similar to a rod knocking. It occurs only when the clutch is let out, i.e. when the input shaft is turning, and changes with engine speed not road speed. Using a stethoscope, it sounded like it was coming from right next to the transmission dip stick. I figued I had a bad bearing or something on the transfer shaft. I pulled the engine and transmission and removed inspection and chain covers. I couldn't see any signs of damage or excessive wear. With the clutch removed, I could turn the shafts easily by hand. There was no noise and the shafts turned freely. Of course I couldn't turn the shaft fast by hand and I couldn't replicate the engine running, So, I rigged a drill and socket and was able to spin up the transfer shaft to over 1000 rpm. Still no noise. As far as I can tell, the only thing different from when I heard the noise in the car is the clutch is not in service with this test. It didn't sound like the noise was coming from the clutch. I'm at a loss to explain it. Has anyone else ever seen anything like this? Any ideas?
posted by 67.30.238...
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