Pulled the CSi from slumber, driving it this week. For a while now, I've been trying to diagnose an annoying squeak. It's a cyclical high-pitch noise, but not RPM-dependent, hopefully, it comes through in the video (I recommend earbuds to listen...it's kind of faint). It's not suspension noise, it's not clutch/gear-dependent as it makes no difference if I'm in gear or neutral, it's somewhat speed-dependent. The noise is erratic, it doesn't always happen, I've tried to replicate it by varying speeds but sometimes it comes and sometimes it doesn't (super annoying when trying to capture it on video!!). It also comes and goes at will! I could be taking off and at 30 mph, I hear the sucker. Sometimes it starts right at take off...and sometimes, it never comes u .
Not sure if it's perhaps brake pads wearing? Maybe wheel bearing? I'll have to dig into thoroughly one day, but wanted some preliminary ideas from the group, if possible.
Please pardon the shakiness of the video, I was trying to fumble the phone, shift, and try to capture the noise.
CB42366 - 1991 850i 6-speed. Brilliantrot & Black Nappa Leather
CD00144 - 1994 850CSi. Hellrot & Black Nappa Leather
My other projects:
Supercharged Tbirds, V8 Tbirds, V8 Mustang Convertible, Audi V8 Quattro & Audi S8
Yep, it's actually coming from outside, i have the same thing. Sounds like the pass side, no clue on what that is!
Center bearing
Hmm....you may be on to something there Dr. T. I'll have to check that out. What kind of danger are we talking about from a worn center bearing?
Doing a little bit of HW on the matter, changing the center bearing has "mission creep" written all over it. We're talking Guibo time, O2's, maybe some shifter work, maybe even exhaust (Eisenmanns?)...you get the picture. I'm wondering about what kind of time I have to get the center bearing fixed so I can position the project aproperly in the never-ending list of things I want to replace on the CSi.
CB42366 - 1991 850i 6-speed. Brilliantrot & Black Nappa Leather
CD00144 - 1994 850CSi. Hellrot & Black Nappa Leather
My other projects:
Supercharged Tbirds, V8 Tbirds, V8 Mustang Convertible, Audi V8 Quattro & Audi S8
Don’t think it’s a problem right now. Squeezing will only get worse...especially when coasting down residential street to a point where it will be embarrassing. That’s probably the time to change it. I’ve done it both by itself and while new driveshaft twice.
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but what about automatics?
Autos have them too.
There is a specific alignment procedure when these are installed, as well as a pre-loading of the center bearing support.
Failure to do so will drastically reduce the lifespan of the new part
'93 850Ci - Mineralweiß Metallic
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ALPINA B7 -Alpinweiß III
...the price of cool ain't cheap!
This is the process (for E38, but E31 the same):
http://www.meeknet.co.uk/e38/e38_remove_propshaft.pdf
Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i
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Thanks Timm.
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Remove exhaust and unbolt driveshaft. Mark the 2 halves of the driveshaft before unbolting and separating the splined halves or else it may not be 100% in balance again (BMW dealer did this to me). R&R Center Bearing and bolt everything back up. New or thread-lock if re-using rear driveshaft bolts or it may come loose in a few months and damage rear DS bearing - BMW dealer failed to do this on mine).
Good time to check/replace Guibo, tranny and shifter bushings
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Last edited by Dr. T; 10-29-2017 at 02:26 PM.
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