Nissan 240SX/Altima 1993-1998 Repair Guide

Driveshaft and U-Joints

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REMOVAL & INSTALLATION



See Figure 1



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of a driveshaft assembly

The 240SX uses a driveshaft with three U-joints and a center support bearing. The driveshaft is balanced as an assembly.

  1. Raise and safely support the vehicle.
  2.  
  3. Matchmark the flanges on the driveshaft and differential for installation reference; this will help maintain driveline balance.
  4.  
  5. Unbolt the rear flange and the center bearing bracket.
  6.  
  7. Remove the driveshaft from the transmission.
  8.  
  9. Plug the transmission extension housing to prevent oil leakage.
  10.  

To install:
  1. Lubricate the sleeve yoke splines with clean engine oil prior to installation.
  2.  
  3. Insert the driveshaft into the transmission and align the flange matchmarks.
  4.  
  5. Install the flange and the center bearing bolts and tighten to 29-33 ft. lbs. (39-44 Nm).
  6.  
  7. Lower the vehicle.
  8.  

U-JOINT REPLACEMENT



  1. Mark the relationship of all components for reassembly.
  2.  
  3. Remove the snaprings. On early units, the snaprings are seated in the yokes. On later units, the snaprings seat in the needle bearing races.
  4.  
  5. Tap the yoke with a brass or rubber mallet to release one bearing cap. Be careful not to lose the needle rollers.
  6.  
  7. Remove the other bearing caps.
  8.  
  9. Remove the U-joint spiders from the yokes.
  10.  

To assemble:

U-joint spiders must be replaced if their bearing journals are worn more than 0.006 in. (0.15mm) from their original diameter.

  1. Place the needle rollers in the races and hold them in place with grease.
  2.  
  3. Put the spiders into place in their yokes.
  4.  
  5. Replace all seals and bearing caps.
  6.  
  7. Tap the races into position and secure them with snaprings.
  8.  

On later model vehicles with snaprings seated in the needle bearing races, different thicknesses of snaprings are available for U-joint adjustment. The play should not exceed 0.007 in. (0.02mm).

  1. Inspect the U-joint assembly. Spline backlash should not exceed 0.019 in. (0.5mm) and driveshaft run-out should not exceed 0.024 in (0.6mm).
  2.  

DRIVESHAFT BALANCING



See Figure 2



Click image to see an enlarged view

Fig. Fig. 2: Driveshaft run-out measuring points

To check and correct an unbalanced driveshaft, proceed as follows:

  1. Remove the undercoating and other foreign material which could upset shaft balance. Road test the vehicle.
  2.  
  3. If vibration is noted, disconnect the driveshaft at the differential carrier companion flange, then rotate the companion flange 90, 180 or 270 degrees and reconnect the driveshaft.
  4.  
  5. Roadtest the vehicle; if vibration still exists, replace the driveshaft assembly. Note that the driveshaft should be free of dents or cracks and run-out should not exceed 0.024 in. (0.6mm).
  6.  

 
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