Power steering rack woes

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gordonmc
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Power steering rack woes

Post by gordonmc » Mon May 13, 2019 9:54 am

This is primarily directed at Mark gtcse8 but it may have wider interest to forum members.
It concerns a leak of power steering fluid from the rack on my 1976 Se6a. The leak appeared to come from where the column enters the rack housing. A couple of years ago I acquired a seal kit from Mark and after fitting the leak appeared cured.
So I was disappointed when tidying up after working on my bike to see a pool of fluid under the Scimitar.
The rack appeared dry but on closer inspection the void in the chassis upright was wet. This is where the column attaches to the rack.
Removing the rack is not a ten minute job, but had to be done.
There is a clear ring of corrosion on the pinion shaft just where the seal sits.
20190512_163530.jpg
20190512_163530.jpg (235.73 KiB) Viewed 966 times
I would appreciate advice on where to go from here.
If Mark sees this, are there replacement shafts and if so can an amateur bodger swap them out? The alternative I guess would be an exchange rack (?).



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scimjim
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Power steering rack woes

Post by scimjim » Mon May 13, 2019 10:24 am

You can get sleeves to fit on propshaft sliding joints - presumably you could use the same principles, machine down the shaft and fit a sleeve (interference fit or weld?)


Jim King

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Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
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Power steering rack woes

Post by derekoss » Mon May 13, 2019 11:01 am

If the rack is in otherwise good nick the a Speedi Sleeve may well work. I even use them on new stuff as they are stainless and solves the corrosion problem. Strictly speaking you don't need to machine the original shaft but smaller diameters sometimes require it.

Derek



gordonmc
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Power steering rack woes

Post by gordonmc » Mon May 13, 2019 11:41 am

I have taken a look at Speedi Seals and they seem to be the answer to my problem.
The size charts indicate I might be able to avoid machining but will take further advice.
Thanks for the tip.



gtcse8
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Power steering rack woes

Post by gtcse8 » Tue May 14, 2019 8:25 am

Just found this item.
I have a special double lipped seal that can replace the original single lip seal.
It MAY stop the leak if the corrosion is not too far down the shaft.
In any case the seal face must be in a very clean condition to prevent wearing away any contacting rubber, so at the very least it needs a good polish with emery cloth.
I have never seen a pinion shaft with a speedi sleeve fitted so I cant comment on weather it would work.
A sleeve would HAVE to be sealed onto the shaft or the oil pressure would just be directed under the sleeve and bypasses the oil seal.

NEW pinions are unavailable and good ones are obviously re used in full rebuilds so carry a high premium, just look at QRG pricelists.

I have replied to you directly Gordon


Mark Wilson. See the Beast on youtube under" RELIANT SCIMITAR CONVERSION LOL.,Se5,Se5a, Se6a, Two Se6b`s,1 & 1/2 GTC`s, SST 1800Ti & not a lot of sense

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Power steering rack woes

Post by derekoss » Tue May 14, 2019 9:39 am

Gordon's looks pretty well pitted at least above the seal area. If there was a need to maintain size it would be an easy enough matter to grind a few thou off that shaft for an appropriate size sleeve.
I always fit them with Loktite. If you have to take them off then it's a "peel" job anyway.

Derek



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Power steering rack woes

Post by gordonmc » Mon Jun 10, 2019 12:18 pm

This is by way of a thank you to Mark (gtcse8) and to let contributors know the outcome of work carried out.
There were problems getting a Speedi Seal of the correct size. Even though suppliers suggested they had them on the shelf on their websites I would need to order a custom made one from the US.
I took the pinion shaft to a local machine shop with the intention of having a minimal amount of metal removed but the man in the brown coat was worried the shaft has a hardened surface so he simply compound-polished it.
Mark's double-lipped seal was fitted and since the rack was put back in and bled it has proved leak-free.
I have now been using the car for a couple of weeks and the garage floor is still clean.
Job done.



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scimjim
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Power steering rack woes

Post by scimjim » Mon Jun 10, 2019 2:21 pm

Result :D


Jim King

SECURE DRY STORAGE FOR YOUR SCIMITAR

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), 1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

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Dennis Nicholas
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Power steering rack woes

Post by Dennis Nicholas » Wed Jun 12, 2019 11:33 pm

I wonder if thorough cleaning and build up with that Blue Magic Quick Steel (epoxy steel?) then turning to size?? (bit like JB Weld?)
But perhaps too soft...a bodge too far?
I was going to try this on pitted top fulcrum bracket swivel pins to take new trunnion bushes (gtcse8's bushes with bonded steel sleeves) but remembered I had a set of new in my spares box.

Dennis


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1980 GTC Trafalgar Blue, 2010 basic Skoda Yeti (petrol), Austin 7s, Rileys.

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