Dis­cov­ery 2 power steer­ing box swap

John Pear­son looks on as Brit­part’s Steve Grant re­places a leaky PAS box

LRO (UK) - - Contents -

The pool of fluid leak­ing from my Dis­cov­ery 2’s power steer­ing box was get­ting worse by the day. With an MOT test loom­ing in a cou­ple of weeks I had to get it sorted – a leak of this mag­ni­tude would in­evitably re­sult in a fail.

It is pos­si­ble to re­place the leak­ing oil seals on th­ese boxes, but ex­pe­ri­ence shows that this can be a short-term fix. The prob­lem is that be­cause the box is in a vul­ner­a­ble po­si­tion, it gets ex­posed to all sorts of crud and win­ter road salt, so the chances are that the shafts will be pit­ted. Fit­ting new seals to pit­ted shafts will re­sult in rapid wear of the seal face and you’ll end up with more leak­age in a short time.

We fit­ted the re­place­ment box on the four-post lift in Brit­part’s work­shop – but the job can be done with the ve­hi­cle up on ramps, jacked up on stands or even on the floor. Your big­gest con­cern is the weight of the box – it’s a heavy old lump to man­han­dle. So it’s ad­vis­able to have a helper to take the weight of it while you’re un­do­ing and fit­ting the se­cur­ing bolts.

We man­aged to keep the steer­ing wheel in the straight-ahead po­si­tion while fit­ting the box. Oth­er­wise the wheel would have to be re­moved and turned on its splines.

When do­ing a job like this, it’s a sen­si­ble idea to check items that you’re re­mov­ing for ac­cess – like hoses and the drive belt. We also took the op­por­tu­nity to check for the cause of a whine from the front of the D2 – which turned out to be a worn bear­ing on the vis­cous fan drive. The idler pul­ley bear­ing was also worn, so we re­placed both and will be show­ing how we did this in a fu­ture is­sue of LRO.

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