Power steering problems

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Jared
Posts: 22
Joined: Sat Jul 20, 2013 11:35 am

Power steering problems

Postby Jared » Tue Aug 27, 2013 5:34 pm

Hi JEC, I've had my 1988 V12 since July. The car is in pretty good shape, however I did note that the PAS fluid needed regular topping up, could not quite see where it was leaking from but it has been leaking whilst parked. After a run last Sunday I was backing the car into my garage, with the steering on hard lock all the fluid leaked out the system resulting in heavy steering and the PAS pump making a protesting noise. I've not yet put the car on ramps to see where the leak is coming from (later in the week). Can any members advise if this is a steering rack problem or hydraulic lines? There does not seem to be much leakage from around the pump, seems mostly to come from where the steering rack is I think (I'm still finding my way around the car).
Also do any members recomend changing the steering rack bushes for better nylon ones?

Brakebuster
Posts: 3131
Joined: Tue Apr 18, 2006 1:17 pm
Location: Gloucester UK

Re: Power steering problems

Postby Brakebuster » Tue Aug 27, 2013 6:03 pm

on the V12 there is a power steering fluid cooler mounted on the front subframe,

check there first, as the cooling coils can rust out ,

it can also come out of the top of the ' tower ' on the valve section of the rack ,

BB
1989 5.3ltr V12 XJS Coupé FULLY RESTORED
2004 2.1V6 X-Type Saloon in platinum silver for the good wife
1994 3.2S XJ40 in Morocco Red with Doeskin interior

used to have
1999 4ltr Sovereign XJ8 in Seafrost

davidr

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Location: Salisbury, Wilts

Re: Power steering problems

Postby davidr » Tue Aug 27, 2013 10:04 pm

I would agree with BB about likely causes of leaks - could be the cooling coils, hoses, pinion seal etc etc - they have many ways of leaking!
In answer to your question about rack bushes I would go for the poybush type. They improve the feel and make the steering more positive and less prone to wandering but don't make the feedback harsh. I have them on my V12 and they are a great improvement.
Regards
David
XJS FORUM COORDINATOR
1996 XJS Celebration Conv. (shown on the JEC stand at NEC Nov 2015)
2001 XKR Convertible

Previously enjoyed!
1989 XJ-S V12 Coupe. 2006 XJ TDVi Sovereign. 1995 XJ6 3.2. 2013 XF 2.2d. 2009 X Type 2.0d Sovereign estate

ptjs1

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Location: Kent

Re: Power steering problems

Postby ptjs1 » Tue Aug 27, 2013 10:21 pm

Yes, as David says, 'urethane rack bushes every time!

Paul
1995 XJS 4.0 Convertible
1980 XJ-S Pre-HE
Jaguar 4.2 Supercharged engine (but not with a Jaguar body..)

PaulGover

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Re: Power steering problems

Postby PaulGover » Wed Aug 28, 2013 9:46 am

A counter-argument - if you have the sports-pack bushes, I'd leave them, assuming they're not falling apart, of course. There's very little difference in the amount of free movement, and they're not easy to remove.

I believe even the standard bushings are OK, provided you replace the rubber-faced thrust washers if they're showing signs of wear or decay. There should be only a small amount of free movement, but in many cases the bushes and thrust washers have been attacked by oil leaks, and that reduces everything to jelly.

Of course, if your bushes are on their way out, it's easiest to replace with plastic, and they won't decay.

If you do replace them, have a bag of washers to fill the gaps between the bushes and the mounting horns on the subframe. I've seen recommendations to bend the horns to remove the play, which strikes me as very dangerous on a safety-related item. The bushes should be shimmed to a comfortable close fit to the mountings; you should not be applying significant bending force to take out the slack. My genuine Jaguar replacement subframe had a lot of slack in the left hand mounting.
1981 XJ6 Series III basket case
1991 XJS V12 "facelift"
2008 XJ TDVi

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Jared
Posts: 22
Joined: Sat Jul 20, 2013 11:35 am

Re: Power steering problems

Postby Jared » Wed Aug 28, 2013 9:46 pm

Thanks for advice chaps, I managed to jack the car up this evening after I'd run the engine and the fluid to leak. I could not find the PAS oil cooler but took a shot of where the leaking fluid is coming from. Any suggestions?
Steering rack.jpg

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ng4xjs
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Joined: Thu Jul 29, 2010 12:49 pm

Re: Power steering problems

Postby ng4xjs » Sat Sep 07, 2013 9:28 pm

Can anyone help mw please? Just had a hose made up from me using the existing ends. Problem is that the hose company put another connector just behind the right angle bend in front of the pump. Stopped the hose from leaking and dripping fluid over the hot exhaust which is good. Problem is that try as I might I just cannot get their re-engineered joint to stop weeping. Looking for a new hose if anyone has or knows of one for sale. Much appreciated.

Thanks
Nick


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