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  #1  
Old 01-29-2010, 06:20 PM
soothappens's Avatar
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240D driveline locknut

I checked my driveline while I was under my car fixing the shifter and found the spline portion very loose. Up and down side to side type of loose .

There is a big nut that seems to lock down on the shaft . I tried to tighten and loosen it but it wont budge. Is there a bushing that goes under this nut or is it supposed to squeeze the outer shaft tighter similar to an adjustable choke on a shotgun ? I used a 24" cresent wrench seems like somethings wrong here.

Any Ideas I searched but only came across the different sizes needed for swaps and center bearing u joint repair threads.

Thanks in advance .
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86 300SDL 387,000? Motor committed suicide
81 300SD 214,000 "new" 132,000 motor
83 300SD 212,000 parts car
83 300SD 147,000

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  #2  
Old 01-29-2010, 07:28 PM
Pooka
 
Join Date: Sep 2005
Posts: 664
It sounds as if you have a bad Carrier Bearing.

The carrier bearing is inside the housing that bolts to the bottom of the car. This is sometimes called the Spider, but the correct name is the Carrier Bearing Housing.

If you can move the driveshaft around inside the carrier bearing housing then what has happend is this: You carrier bearing has frozen up and torn up your housing.

The good news is that the parts to fix this are cheap and the job is easy. The bad part is that it takes forever and you might have to pull the exhaust system to take out the drive shaft.

One thing to be aware of is that the driveshaft was balanced as a unit at Mercedes and will need to go back together the same way as it came apart, so mark the relationship of the front shaft to the rear one with paint before you take them apart.

Also try not to knock off any of the balance weights. If you do they are easy to replace by just sticking them back on with super-glue.

Do some research on how to replace the carrier bearing housing and bearing on your car as there is a bit of difference between the 115 and 123 versions.
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  #3  
Old 01-30-2010, 12:01 AM
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Thanks for the reply Pooka

The carrier bearing was shot when I bought the car . It was replaced soon after. the nut I'm talking about is where the drive shaft slips together . It has splines male on the inner shaft and female on the outer shaft the nut attaches to the outer one. Between the two is where the play is. I wish I knew the technical term for it.
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Experience : what you receive 3 seconds after you really needed it !!




86 300SDL 387,000? Motor committed suicide
81 300SD 214,000 "new" 132,000 motor
83 300SD 212,000 parts car
83 300SD 147,000

91 F700 5.9 cummins 5spd eaton 298,000
66 AMC rambler American 2dr auto 108,000
95 Chevy 3/4 ton auto 160,000
03 Toyota 4runner 180,000 wifes
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  #4  
Old 01-30-2010, 01:44 AM
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2 doors, 5 cylinders
 
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I think I know what you're talking about.

Is there lateral play? (sliding the driveshaft from the front to the back of the car?

If so this should be normal, the splines act as a slip joint to allow for movement that happens in our lovely unibody beasts.
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  #5  
Old 01-30-2010, 03:49 AM
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As you tighten down on the nut, it squeezes the shaft to the splines. it isn`t on very tight. Use a large pair of channel locks to remove it.

Most I have removed, the nut loosens pretty easy, I had one a couple weeks ago on a 240 that wouldn`t. I needed the front half only. once I had it off the trans, I tapped it off with a hammer. the splines were rusty.

Charlie
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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

http://i30.photobucket.com/albums/c3...ilys/boobs.gif


Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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  #6  
Old 01-30-2010, 11:29 AM
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Quote:
Originally Posted by charmalu View Post
As you tighten down on the nut, it squeezes the shaft to the splines. it isn`t on very tight. Use a large pair of channel locks to remove it.

Most I have removed, the nut loosens pretty easy, I had one a couple weeks ago on a 240 that wouldn`t. I needed the front half only. once I had it off the trans, I tapped it off with a hammer. the splines were rusty.

Charlie
It kind of looked as if thats how it worked , but without the nut moving I didnt want to destroy anything .

Is there a point where it just doesnt tighten up any more and you consider it worn out Or does it compensate for the wear as long as the splines are still intact ?

Nick The best way I can describe the wear would be similar to a loose wheel bearing kind of a rocking movement.



Thanks for the replies Time to try them out . ITS HAMMER TIME !!!!
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Experience : what you receive 3 seconds after you really needed it !!




86 300SDL 387,000? Motor committed suicide
81 300SD 214,000 "new" 132,000 motor
83 300SD 212,000 parts car
83 300SD 147,000

91 F700 5.9 cummins 5spd eaton 298,000
66 AMC rambler American 2dr auto 108,000
95 Chevy 3/4 ton auto 160,000
03 Toyota 4runner 180,000 wifes
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  #7  
Old 01-30-2010, 02:51 PM
nickofoxford's Avatar
2 doors, 5 cylinders
 
Join Date: Jul 2008
Location: S.E. PA
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Quote:
Originally Posted by soothappens View Post
Nick The best way I can describe the wear would be similar to a loose wheel bearing kind of a rocking movement.
Huh.. first thing that comes to mind is the center support, which you replaced.. I'd like to see what you guys come up with.
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  #8  
Old 01-30-2010, 08:43 PM
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Location: Weston, FL
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This may help:

http://www.peachparts.com/Wikka/W123DriveShaftSupportBearing

Scott
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Scott
1982 Mercedes 240D, 4 speed, 275,000
1988 Porsche 944 Turbo S (70,000)
1987 Porsche 911 Coupe 109,000 (sold)
1998 Mercedes E300 TurboDiesel 147,000 (sold)
1985 Mercedes 300D 227,000 (totaled by inattentive driver with no insurance!)
1997 Mercedes E300 Diesel 236,000 (sold)
1995 Ducati 900SS (sold)
1987 VW Jetta GLI 157,000 (sold)
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  #9  
Old 01-31-2010, 12:22 PM
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Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
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I knew the nut was 46mm, I didn`t know the other was 41mm. I have been looking for a wrench for a while. what is the SAE size?

If the trans is in gear and the parking brake is on, only need the 46mm.
sometimes in the Junk Yard, we don`t have those luxuries.


Charlie
__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

http://i30.photobucket.com/albums/c3...ilys/boobs.gif


Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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  #10  
Old 01-31-2010, 12:54 PM
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This link sure helped me while I was looking at 14mm tools.

http://www.hamuniverse.com/antfrac.html
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