That looks frightening. The steering box casting has cracked at the weakest part across the filler plug so might be caused by excessive tightening of the plug. Alternatively, the box may have been incorrectly adjusted, so extra resistance on the gear would tend to make the worm gear drive out. Check the steering box mountings for deformation.
Replace the complete assembly, but first check all steering component for any resistance or fouling on outer parts. Disconnect steering rod ball joints and test their movement and ensure the relay, steering box arm and relay top arm move freely. Check the drag link and trackrod are straight and that nothing is fouling them, such as a damaged damper, brackets or incorrectly fitted steering guard. Check the trackrod end ball joint and, while and recheck the steering swivel movement. The steering swivel should register between 3.6 and 4.5kg when pulled using the spring balance, with the rear oil seal disconnected. Also, ensure the steering lock stops are correctly set.
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