Driveline vibration

[elemental]

Just replaced the clutch in my car, and now in second gear under moderate acceleration, @ 2000 - 2150 rpms what feels like the driveline shudders, thought at first it might be the clutch slipping but it doesn’t happen in any other gear or RPM or throttle, another idea that I have had is the tranny mounts are shot, could the drive train be twisting enough to make the angles on the drive line shake? The gibo is brand new and the u joints didn’t seem like they had any play in them? Any thoughts ? thanks

[bimmerphile]

hmm you replaced the clutch without the tranny mounts?

[elemental]

Dont have the money to do everything I would like to sometimes,,. So you think that is were the prolrem lies or you just flipin me shit?

[Bill 84 318i]

Does it only happen in second gear or does it happen at that speed in any gear?

[elemental]

Only in second gear, under mod-heavy throttle, when it hits 2000 rpm it starts to thump, shake in the floor by the seat's until about 2150rpms, allso the harder you are on the gas the more amplitude the shudder, shake, shimmi, thumping is. thanks,

[RedBaron86325]

center bearing housing cracked

[elemental]

So a replacment bearing wont due the trick I need to get a new housing? junk yard? :? When I removed the driveline this weekend I had to unbold the diff and slide it back to gain clearance for removing the driveline is there a trick to getting it out? Allso I have been reading today that you need to preload the center bearing? when I removed the driveline the first time I marked were the bearing was positioned and set it to the same spot for reinstallation, allso found this "I've become an expert at these drive shafts........your problem is that you didn't align the shaft when you re-installed. You need to make sure that both front and rear tubes are in line. BMW makes a special tool to check this ($$$$$ of course) but you can mke one with some 1/8" 3-ply. It needs to be about 3 ft long by 3 inches wide, with a 1-1/2" deep by 6" long groove in the middle. Just hold this up against the shaft and then use flat washers under the center-bearing mounts to bring it into line. You'll be amazed at the results." dose this seam to apply? I wouldnt think that the driveline angle would not change from just changing the clutch and gibo.. getting under the car today see what is going on anyway to test the center bearing / housing?

[RedBaron86325]

You need to check the housing of the center bearing to see/feel if it is cracked. The center bearing housing is steel covered in rubber. Although it may look to be fine, move it around and feel for cracks since the rubber surround may not be broken, only the steel inside. If you pulled the driveshaft apart and didn't put it back together in absolutely the same spot (clean and check for white dots on each half) the driveshaft may no longer be balanced and will many times cause a failure of the center bearing housing.

[elemental]

The 2 drivelines were not seperated, will check the center bearing carrier tonight.. thanks again

[matt325is]

Make sure all of your driveshaft bolts are secure. I found a bolt in my driveway a few weeks ago, turns out it was the vibration i was feeling. I had to replace the bolt, because it was stripped, and works fine now. Though, i would chekc your centerbearing as well.

matt

[elemental]

Well I took it apart today, to find that the gibo I replaced last week failed and had allready torn itself apart, so I replaced the tranny mounts, the center bearing/dampener and the gibo again ,,,,,it cleared it all up, There is a little vibration but i think it is within tolerance ;)