The viscous coupling’s two support bearing need to be removed from the refitted to the VCU using a hydraulic press. When refitting assembly, ensure the support bearing flanges are flat, clean and free of burs and other damage. Offer the complete assembly into position and keep it all supported while the VCU support bearing bolts are loosely fitted. Bolt the rear propshaft flange to the diff and the CV flange to the IRD, aligning with the marks made before removal. Ensure the viscous coupling’s support bearing are accurately at 90 degrees to the centre line of the coupling before tightening the rear bearing bolts, then the front ones.
The propshaft are splined onto the shaft of the viscous coupling. They will sometime pull away from the coupling after releasing the single securing bolt and removing the U shaped washer under its head. If not, try driving steel wedge between bolt head and propshaft yoke to separate them. When the connection being to move, wind the bolt out, and repeat. That’s the theory, but if the connection is very tight, this might bend the bolt. In that case, it’s down to ingenuity force.
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