Mercedes Coupes/Sedans/Wagons 1974-1984 Repair Guide

Driveshaft and U-Joints

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See Figure 1

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Fig. Fig. 1: Troubleshooting the Driveline

REMOVAL & INSTALLATION 230, 240D,280, 280C, 280E, 280CE, 300D, 300CD, 300TD Models



See Figures 2, 3, 4 and 5

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Fig. Fig. 2: To remove the driveshaft, loosen the clamp retaining bolts



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Fig. Fig. 3: Using a back-up wrench, loosen the driveshaft-to-differential bolts ...



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Fig. Fig. 4: ... then separate the driveshaft flange from the differential



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Fig. Fig. 5: Slide the driveshaft rearward, disengage it from the transmission and remove it from the vehicle

Matchmark all driveshaft connections prior to removal.

  1. Remove the equalizer and disconnect the parking brake cables.
  2.  
  3. Remove the bolts which secure the two brackets to the chassis at the front and rear and remove the brackets. It may be necessary to lower the exhaust system slightly to allow access to the left-hand bolts on the rear bracket.
  4.  
  5. Loosen the nut on the driveshaft about 2 turns without pushing the rubber sleeve back (it slides along). On a two-piece shaft, only loosen the front clamp nut.
  6.  
  7. Remove the nuts which secure the attaching plate to the transmission flange and rear axle.
  8.  
  9. Remove the bolts which secure the intermediate bearing(s) to the chassis. Push the driveshaft together and slightly down, and remove the driveshaft from the vehicle.
  10.  

If possible, do not separate the parts of the driveshaft since each driveshaft is balanced at the factory. If separation is necessary, all parts must be marked and reassembled in the same relative positions to assure that the driveshafts will remain reasonably well balanced.

To install:
  1. Installation is the reverse of removal.
  2.  
  3. Pack the cavities of the two centering sleeves with special Mercedes-Benz grease.
  4.  
  5. Install the driveshaft and attach the intermediate bearing(s) to the chassis.
  6.  
  7. Rock the car backward and forward several times to be sure that the driveshaft is properly centered without forcing.
  8.  
  9. Prior to tightening the clamp nuts on a three piece driveshaft, be sure that the intermediate shaft does not contact either the front or rear intermediate bearing. The clearance between the intermediate shaft and the bearing should be the same at both ends.
  10.  

Other Models

Steps 1-3 apply to 4-cylinder and V8 models. Matchmark all driveshaft connections prior to removal.

  1. Fold the torsion bar down after disconnecting the level control linkage (if equipped).
  2.  
  3. Remove the exhaust system.
  4.  
  5. Remove the heat shield from the frame.
  6.  
  7. Support the transmission with a jack and completely remove the rear engine mount crossmember.
  8.  
  9. Without sliding the rubber sleeve back loosen the clamp nut approximately two turns (the rubber sleeve will slide along).
  10.  

On 3-piece driveshafts, only the front clamp nut need be loosened.

  1. Unscrew the U-joint mounting flange from the U-joint plate.
  2.  
  3. Bend back the locktabs and remove the bolts that attach the driveshaft to the rear axle pinion yoke.
  4.  
  5. Remove the bolts which attach the intermediate bearing(s) to the frame. Push the driveshaft together slightly and remove it from the vehicle.
  6.  
  7. Try not to separate the driveshafts. If it is absolutely necessary, matchmark all components so that they can be reassembled in the same order.
  8.  
  9. Installation is the reverse of removal. Always use new self-locking nuts. After the driveshaft is installed, rock the car back and forth several times to settle the driveshaft. Make sure that neither intermediate shaft is binding against either intermediate bearing, and that the clearance between the intermediate bearing and the driveshaft is the same at both ends.
  10.  

 
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