REMOVAL & INSTALLATION
See Figure 1
The 240SX uses a driveshaft with three U-joints and a center support bearing. The driveshaft is balanced as an assembly.
- Raise and safely support the vehicle.
- Matchmark the flanges on the driveshaft and differential for installation reference; this will help maintain driveline balance.
- Unbolt the rear flange and the center bearing bracket.
- Remove the driveshaft from the transmission.
- Plug the transmission extension housing to prevent oil leakage.
- Lubricate the sleeve yoke splines with clean engine oil prior to installation.
- Insert the driveshaft into the transmission and align the flange matchmarks.
- Install the flange and the center bearing bolts and tighten to 29-33 ft. lbs. (39-44 Nm).
- Lower the vehicle.
- Mark the relationship of all components for reassembly.
- Remove the snaprings. On early units, the snaprings are seated in the yokes. On later units, the snaprings seat in the needle bearing races.
- Tap the yoke with a brass or rubber mallet to release one bearing cap. Be careful not to lose the needle rollers.
- Remove the other bearing caps.
- Remove the U-joint spiders from the yokes.
U-joint spiders must be replaced if their bearing journals are worn more than 0.006 in. (0.15mm) from their original diameter.
- Place the needle rollers in the races and hold them in place with grease.
- Put the spiders into place in their yokes.
- Replace all seals and bearing caps.
- Tap the races into position and secure them with snaprings.
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).
- 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).
See Figure 2
To check and correct an unbalanced driveshaft, proceed as follows:
- Remove the undercoating and other foreign material which could upset shaft balance. Road test the vehicle.
- 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.
- 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).