Handy Howie
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The steering box on my 1999 Land Rover Discovery TD5 recently started to leak from the output shaft when turning the steering wheel to full lock.  At first, it was just a few drips, but then started to leak a significant amount, so I needed to do something about it.  I had recently replaced my 1998 Discovery TD5 with a 2003 Discovery TD5, so I was able to take the steering box of the 1998 Discovery.

The coolant pipes below the front pulley need to be able to move away from the steering box.  There are 2 bolts that secure it.

I next slackened off the 4 bolts that hold the steering box to the chassis.  With the axle jacked up, it is possible to get access to all 4 bolts.

Next was to undo the steering column universal joint that connects to the steering box input shaft.  There are 2 bolts, one of which can be seen in this photo.  The UJ can then be slid up the shaft and off the steering box spline.

The clamp that holds the power steering pipes into the the steering box was now released by undoing the single bolt.  The pipes were then pulled from the steering box.

The drag link ball joint was then released from the steering box output arm.  To keep enough friction on the ball joint, I pressed the ball joint up using a jack.

Finally the front panhard rod was disconnected and the 4 steering box bolts removed.

It is quite surprising how heavy the steering box is.  Trying to lift it with one hand while moving pipes out of the way with the other hand is quite difficult.  In the end, I used a ratchet strap to hold the steering box up while maneuvering it into place.

All the remaining work is just the reverse of disassembly.