Well, Its weeping again !!!!!!!!!!!!!!!!

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KennyW
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Well, Its weeping again !!!!!!!!!!!!!!!!

Post by KennyW »

Good Morning All,

One guess everyone to what I am refering to ?

The low pressure pipe to the steering pinion.

It is only weeping gently but I'm considering my options.

I'm thinking of using epoxy resin and sealing it permantly.

My only concern is, will the LDS fluid react with the resin.

Thoughts please,

Kenny

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white exec
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Re: Well, Its weeping again !!!!!!!!!!!!!!!!

Post by white exec »

I take it it's this one again, Kenny.
viewtopic.php?f=3&t=61239&p=591754#p590623
Did you try a slightly thicker Viton O-ring? How was it left, eventually?

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Sloppysod
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Re: Well, Its weeping again !!!!!!!!!!!!!!!!

Post by Sloppysod »

The pipes on the X7 are a soft aluminum alloy and can be easily bent out of shape. I know it is not the easiest job in the world, but once off the car, or away from the rack try to pass a small drill down the end of the pipe to make sure it is still round or make round again.
As for the seals, I used 1 off, 8mm & 1 off 9 mm bore o-rings made from 2 mm diameter Viton rubber, not sure which one is for the low pressure pipe I have had no sealing issues...yet.
Also, Is the forked plate that holds the tubes in place flat and nothing trapped between it and the rack housing? or The low pressure pipe is not routed the wrong way, under tension before being clamped?

Good luck!
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Pipe Plate
Pipe Plate

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KennyW
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Re: Well, Its weeping again !!!!!!!!!!!!!!!!

Post by KennyW »

Stu,

I used new Viton rubber o seals 8mm and 9mm, 2mm thick.

The plate as far as I can tell is flat.

I don't know about the roundness of the pipes.


Kenny

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white exec
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Re: Well, Its weeping again !!!!!!!!!!!!!!!!

Post by white exec »

Would it be possible to up the O-ring thickness by a small amount?
Needs to be the tightest fit possible, without damaging the O-ring. Use a touch of Vaseline when fitting.

The O-ring must obviously be a snug fit onto the bore, but I'm not sure whether the O-ring is just meant to contact the sides of the bore, or whether it is also pushed down on to a seating in the bore as the clamp plate is tightened.

If the latter, then, with the pipes pushed in fully by hand, and the clamp plate positioned but not tightened down, there should be a small gap (maybe 1mm) between the clamp plate and the rack body, so that when the plate is bolted down, the O-ring compresses against any seating (and the bore sides). O-rings don't really pressure-seal unless they are compressed. Just a thought; not sure about the design of those bores.

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bobins
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Re: Well, Its weeping again !!!!!!!!!!!!!!!!

Post by bobins »

In common with quite a few modern car steering pipes, these should only really be regarded as single use. If you're lucky, you may get them to seal a second time, but the pressed collar on the HP and LP pipes is designed to seat tight into the pipes sockets on the rack and once it's disturbed it's pot-luck if it'll go back exactly in the right position. If you could find a way of reforming the collars or getting a wafer thin seal to sit on the collars so it seats against the pipe sockets on pinion casting then you might be on to a winner.
Steering pipes - own work
Steering pipes - own work
Note - one of the above pipes is for the pump end, but the principle is the same.

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bobins
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Re: Well, Its weeping again !!!!!!!!!!!!!!!!

Post by bobins »

white exec wrote:
17 Mar 2019, 19:23

The O-ring must obviously be a snug fit onto the bore, but I'm not sure whether the O-ring is just meant to contact the sides of the bore, or whether it is also pushed down on to a seating in the bore as the clamp plate is tightened.


There's no seating in the bore - it's just a straight bore that the 'O' ring sits in.
The 2 bores are 11.2mm and 12.1mm dia.

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white exec
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Re: Well, Its weeping again !!!!!!!!!!!!!!!!

Post by white exec »

Not the best, then. Thanks for clarifying.
Chubbiest O-ring possible (without damaging it) is the best option.

Polymax list a huge range of sizes of Viton.
As suggested, it might be possible to fit a second ring under the circular flange.

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KennyW
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Re: Well, Its weeping again !!!!!!!!!!!!!!!!

Post by KennyW »

Thanks for the replies, okay which o seal for which pipe. I thought it was 9mm seal for LP side ie bottom pipe on pinion.

Kenny

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white exec
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Re: Well, Its weeping again !!!!!!!!!!!!!!!!

Post by white exec »

O-rings are dimensioned as I.D. x thickness.
Best thing to do is measure your pipes and bore, and order up a few sizes, and see which gives best (snug) fit. Vernier caliper best for measurement, and not expensive either (if you don't already have one).

As a rough guide, choose I.D. of 1mm less than your pipe, and a thickness which will produce about 0.5mm of "squash" (compression) when pushed into the bore.

Polymax (in Bordon, Hants) have a vast range of sizes in Viton, and their website gives all the sizes and minimum order quantities. You can order O-rings in tiny numbers from ebay/web suppliers, but the range of available sizes might be limited. Suggest using the Polymax site to find what you need first. They are a good firm to deal with. Deliveries ex-stock really quick.

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Re: Well, Its weeping again !!!!!!!!!!!!!!!!

Post by RichardW »

If it's the LP side, and only weeping, I'd be tempted just to back off the clamp, wind 2-3 turns of PTFE tape around the pipe under the collar and shove it back together....!

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Re: Well, Its weeping again !!!!!!!!!!!!!!!!

Post by GiveMeABreak »

I’ve seen people use PTFE tape to seal their oil drain plugs after an oil change as they can’t be bothered to get a new one, and it has been shown that it breaks up, allowing parts of the tape to enter the sump which can be seen after a future oil change. So not sure how robust it would be long term.

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Hell Razor5543
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Re: Well, Its weeping again !!!!!!!!!!!!!!!!

Post by Hell Razor5543 »

I wonder (only wonder, as I DON'T know) what would happen if you put the old O rings in hot water for a while? Would it allow them to return to their original shape?

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white exec
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Re: Well, Its weeping again !!!!!!!!!!!!!!!!

Post by white exec »

Once damaged or deformed, they won't return to original shape. Easy enough to obtain new, either singly or in a qty pack. It's unwise to re-use any O-ring that has been clamped; those in moving and lubricated mechanisms can be the exception, if not worn/damaged.

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GiveMeABreak
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Re: Well, Its weeping again !!!!!!!!!!!!!!!!

Post by GiveMeABreak »

Kenny - there's a fair bit on another thread about this when mine went last year:

viewtopic.php?f=3&t=60155&hilit=o+ring&start=45#p576062

With a link to the place where you can order as few or as many of the seals as you want - Stu and I bought these seals.