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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Fri, May-18-2018, 10:50:48 PM   #1
Mindart
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Default Getting ready to do Flex disc and CSB

The car in question.... 1999 M3

Just wanting some last minute advice before I dive in to this one....

Have researched a fair amount on this topic so here are my final questions to those who have done this one....

1) is it best to take the whole shaft out of the car and separate it away from the vehicle? or is the job not much more difficult if i leave it in?

2) I know i need to mark the drive shaft etc to put back together, but if I do pull the whole thing out should i mark it back on the final drive flange too?

3) Removal of the CSB.... some cut out the rubber and use a puller, I have seen some use a punch ( a brass to be exact) preferred method?

4) install of new bearing.... what did you guys use to press it back on? tapped with a punch or a socket of some sort?

5) preload the bearing? simple as moving it towards the transmission 1mm-4mm per the service manual . Or can i simply just mark the bolts were the old one was on the driveshaft tunnel and just reinstall in that exact same place

I guess that's all... probably over thinking it but figured i'd reach out

thanks!
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Old Sat, May-19-2018, 04:42:03 AM   #2
Texaz3
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Default Re: Getting ready to do Flex disc and CSB

1. Either way. Don't need to take entire shaft out for CSB.
2. No
3. Jaw puller is the best for this.
4. Piece of suitable diameter PVC pipe
5. Move forward before tightening the bolts.

Get new crush nuts for guibo. Don't forget to torque to spec.
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Old Sat, May-19-2018, 02:32:41 PM   #3
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Default Re: Getting ready to do Flex disc and CSB

I would pull the driveshaft out if it were me. I don’t like rolling around on my back any more than I have to
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Old Sat, May-19-2018, 11:12:06 PM   #4
Mindart
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Default Re: Getting ready to do Flex disc and CSB

Got the exhaust and heat shields off

Drive shaft has been marked. CSB looks to be in fine condition. No cracks in sight. Flex disk is genuine and cracked. Car has 148k on it but no records. I have to assume the csb has been done but have no idea the part quality or what mileage

I have a genuine csb. I am thinking of still doing it just for the sake of it since I am here

Also tried to wiggle drive shaft. Rear portion has zero play. Front portion has maybe 1mm front to back. Just a guess

Thatís within spec. Right?
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Old Sun, May-20-2018, 06:01:43 PM   #5
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Default Re: Getting ready to do Flex disc and CSB

You mean wiggle in U-joints? There shouldn't be any, but 1mm is nothing to worry about.
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Old Sun, May-20-2018, 06:11:23 PM   #6
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Default Re: Getting ready to do Flex disc and CSB

Quote:
Originally Posted by englishtom1596q View Post
I would pull the driveshaft out if it were me. I donít like rolling around on my back any more than I have to
I agree. The job will be quicker overall with the additional steps to remove it.

U-joints should have no play in them, but there are no easy replacements so some play is tolerable.
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Old Mon, May-21-2018, 01:34:01 PM   #7
Mindart
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Default Re: Getting ready to do Flex disc and CSB

I took the whole thing out. Not difficult at all.

Having done that I agree it is a lot less awkward working on drive shaft out of car


***update*** I took a look at the diff bushings last night and they look OK, but i think i see a hairline crack on the front diff mount bushing. At this point with exhaust/drive shaft out it might be a good idea to just tackle this too? There has been no drive-ability issues on this car in terms of clunking etc... but in the spirit of getting this car dialed in I am contemplating doing it.

2 questions

1) can this be done by myself? I have done everything else by myself up to this point ( I did have my wife help with the jack when lowering the exhaust down) I'd assume the same can be done with the diff... or is it best to have another , stronger set of hands to help when lowering it out.

2) if i go to poly bushings is there any downside to that? excess vibration, more stress on the subframe mounts to the body etc...

goal of this car is to be a nice weekend driver and not harsh but to be able to do some spirited driving

thanks!


Quote:
Originally Posted by Braymond141 View Post
I agree. The job will be quicker overall with the additional steps to remove it.

U-joints should have no play in them, but there are no easy replacements so some play is tolerable.

Last edited by Mindart; Mon, May-21-2018 at 03:49:40 PM.
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Old Mon, May-21-2018, 04:34:37 PM   #8
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Default Re: Getting ready to do Flex disc and CSB

1. Diff is not heavier than a muffler
2. You will feel more vibration with urethane, but not much more.
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Old Mon, May-21-2018, 05:26:16 PM   #9
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Default Re: Getting ready to do Flex disc and CSB

The diff can be lowered with one person, but that depends on your strength.

There are plenty of downsides to poly. The vibration already noted, gear wine transfer is significantly increased, driveline lash when loaded up and general lack of longevity with many brands. Stick to OEM for a street car.
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Old Mon, May-21-2018, 06:49:00 PM   #10
Mindart
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Default Re: Getting ready to do Flex disc and CSB

ok, OEM it is ...

Yeah, I'll probably just have the wife deal with lowering the diff if i need to. I am not concerned about the weight ... I just know you kind of have to tilt it back to get it to slide out, its not as simple as it just dropping down.

( I have done this one other time, but it was with a buddy on a lift ) never done it on jack stands and being solo.

thanks for the perspective ....

Quote:
Originally Posted by Braymond141 View Post
The diff can be lowered with one person, but that depends on your strength.

There are plenty of downsides to poly. The vibration already noted, gear wine transfer is significantly increased, driveline lash when loaded up and general lack of longevity with many brands. Stick to OEM for a street car.
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Discussing Getting ready to do Flex disc and CSB in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)