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Re: Your Opinion Please - 90 535iM driveline repai (archive)

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Posted by moots on January 05, 2000 at 16:34:20:

In Reply to: Your Opinion Please - 90 535iM driveline repair! posted by Jeff N. on January 05, 2000 at 13:27:55:

Hi Jeff,
This is the sort of problem that many a DIY face,ie diagnostic troubleshooting.I face it many times when the defect is not fixed by replacing the suspect parts,and have also,many times,left the car disassembled,to get parts from the dealer.
However I get real satisfaction in getting the defects fixed myself and am more confident about the job rather than have somebody else do it.
I read your description of vibration symptoms with great interest,especially the part where the car "floats" when the car and engine speed match and I think I know exactly what you mean tho I have never experienced this in my car.I would go inspect the driveline with a magnifying glass ie guibo,ctr brg,shaft exessive play and maybe the diff gearbox could be faulty.

good luck
moots '90 520i

: I have an emerging "vibration" in the driveline of my 90 535i. Gear selector vibrates in 4th gear, varies with engine load on acceleration & deceleration, no chassis vibration at this time.

: Car has 86k miles. 5 speed. Have not done an undercar inspection because it's my understanding that to do a full driveline inspection requires that you drop the exhaust system AND fully remove the drive line to check the u-joints (per Callan in the archives).

: Here's the question: Do you -

: Option 1: Order a rebuilt driveline and just plan to swap. Forego the inspection and assume the current is no-good? New driveline is $340 plus $60 shipping (includes core return). Pros are new driveline, do job in one shot. Risk is you don't need a new driveline and spend too much money. Worst case is that problem is misdiagnosed and NOT the driveline at all!

: Option 2: Do a full inspection & discover the driveline is bad. Put the entire car back together while waiting for the new driveline (must order) and essentially do the job twice? Pros are you might save some $$ by only replacing what's needed, ensure diagnosis of driveline is correct. Cons are you basically have to do the job twice and you still have an old driveline with selected new parts.

: I'm planning to replace the guibo and tranny mounts in all cases. They are sunk costs. Any other parts while I'm there? Considering doing the O2 sensor also although car runs fine.

: What option would you choose if you were in my shoes? Is there another option if haven't considered?

: How risky is my current diagnosis that the problem IS my driveline?

: The car's a daily driver so I can't afford a 3-5 day down time.

: Thanks in advance!

: Jeff
: 90 535iM Sharked




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