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Car Forum / Porsche / Porshe 944 / December 2006Rattle and vibration noises, possibly the clutch.
1990 944 cabriolet Hey guys. I have begun to notice vibration noises and rattling coming from what sounds like the underside of the car. The noises are most audible when I'm stopped, and the car is in neutral. What I have noticed is that the noises go away when I push in the clutch. But as soon as I release it, the noise comes right back. They don't appear to get louder or faster if I hit the accelerator, but it is hard to say for sure. So does this sound like a clutch problem to you guys? Is this something that can be ignored or adjusted? Or is it time for a new clutch? Thanks for the help. Scott/ You need a new throw out bearing. It will be alright to drive but eventually will fail and leave you stranded somewhere. Ok what happens when you step on the clutch pedal. The release bearing pushes against the pressure plate and the pressure releases off of the clutch disc hopefully causing it to stop rotating the "driveshaft" to the transmission. Also the pilot bearing allows the "driveshaft" to stop spinning. So if you allow the clutch pedal to return, the clutch disc starts spinning the driveshaft and supplies rotational power to the transmission. There should be 1 or 2 bearings inside of the driveshaft tube and a coupler that mates the driveshaft to the transmission input shaft. So release bearing could be loose, or it's arm. Could be the driveshaft bearings Could be the coupler to the trans. MAKE SURE THAT IT IS TIGHT AND NOT GOING TO TAKE OUT THE DRIVESHAFT AND TRANSMISSION SPLINES. Could be the transmission itself. This should be true for the '78 924 I looked at and I will conclude it is true for the 944 also. Please correct me if I am wrong. Of course check other items such as motor and transmission mounts, exhaust system and anything else that might be under your car. later, dave (One out of many daves) > 1990 944 cabriolet > [quoted text clipped - 18 lines] > Thanks for the help. > Scott/ one minor correction - on the 944 and 924, the throwout bearing PULLS on the clutch fingers to release the clutch, on most cars it's a push but not on ours > Ok what happens when you step on the clutch pedal. > The release bearing pushes against the pressure plate and the pressure > releases off of the clutch disc hopefully causing it to stop rotating the > "driveshaft" to the transmission. Also the pilot bearing allows the > "driveshaft" to stop spinning. snip---------  SignaturePosted via a free Usenet account from http://www.teranews.com The throwout bearing also rides on a little metal tube piece that mounts onto the inside of the bell housing. I've had that come apart and rattle around on the drive shaft when the clutch is out.... Whatever it is, if you're mechanically inclined, it's worth it to fix it (allow yourself a weekend to do the job, unless you've done it before, in which case it can be done in a day -- I'm currently down to about 6 hours to do a clutch.) Good luck! > one minor correction - on the 944 and 924, the throwout bearing PULLS on the > clutch fingers to release the clutch, on most cars it's a push but not on [quoted text clipped - 6 lines] > > snip--------- thanks! so then it could be the release bearing making noise in this case. Although I do believe when I changed the clutch on a '78 924 the release bearing pushed on the pressure plate. The release bearing is the same/similar to what is on the 72 VW Beetles. I guess that this was changed in later models like 1990. > one minor correction - on the 944 and 924, the throwout bearing PULLS on > the clutch fingers to release the clutch, on most cars it's a push but not [quoted text clipped - 4 lines] >> "driveshaft" to the transmission. Also the pilot bearing allows the >> "driveshaft" to stop spinning. You are probably off the hook easier than you think. The sound you hear is most likely the idler gear. The OEM 944 clutch had a rubber doughnut center and took up much more room in the bell housing than the replacement spring centered clutch does. This void allows the torque tube and bell housing to act as a giant amplifier, increasing the noise from the idler gear. The noise is further compounded by the natural erosion of your transaxle's lubrication. The simplest fix is to drain and replace your transaxle fluid, the noise should reduce. I went the Swepco direction and cut the noise down close to 90%. Here is a test to see if it is in fact that idler gear. 1. Start the car when it is cold and let it run in neutral. Do you hear the noise? Most likely not. 2. Drive it up to normal temperature and see if the noise is there, it should be. As you have broken down you transaxle fluid with heat, the idler gear will be more prevalent. I don't think you have any other problem than that. > 1990 944 cabriolet > [quoted text clipped - 18 lines] > Thanks for the help. > Scott/ Devils944S2, Hey there, I just read your post about a 944 drive line noise(pasted below). I am in hopes that you might listen to my similar situation and share your thoughts. I just purchased a 1990 S2. It has 88k miles on it. It needed a clutch job due to the usual rubber disc deterioration. I did the clutch job and now have that "bearing noise". At first I thought it was the new throwout bearing. maybe the spacers were not installed right? I then got to thinking about the driveshaft bearings. I have little to no noise when started cold. It does get louder as it is driven. Are the driveshaft tube bearings serviceable? Does that whole damn tube have to come out to replace them!? Also, I changed out the tranny gear oil at the same time as my clutch job. I used mobil 1 75w90 synthetic gear oil. Is it possible this could cause a lot of rukus in the torque tube? What is the "Swepco direction" recommendation? After warming up and making the noise, when I start off in first gear it seems to make a lot more noise when accellerating hard. I believe it does this when shifting into other gears as well. Thank you very much for any advice! -- JW > You are probably off the hook easier than you think. The sound you hear is > most likely the idler gear. The OEM 944 clutch had a rubber doughnut center [quoted text clipped - 40 lines] > > Thanks for the help. > > Scott/ Check here for instructions to replace the drive shaft bearings. http://www.clarks-garage.com Scott, Agree with devils944. Mine does the same thing. Replace with SWEPCO and it will get much better. 924SBob > 1990 944 cabriolet > [quoted text clipped - 18 lines] > Thanks for the help. > Scott/ |
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