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Post by Deleted on Sept 20, 2009 15:26:48 GMT
Help , My P5 saloon sailed throught the MOT an d then 2 days gentle use and the power steering failed. I hav echecked the pump and it is pumping, the steering box does not leak . my only doubt is possible contamination of the ATF with EP 90 when I topped it up before the test. Any suggestions as to how I can eliminate the pump as the cause ?
PS I hav ebodged up the activation key and can' taccess the members only pages .
Thanks for any help in advance Desperate Doug!
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Post by Phil Nottingham on Sept 20, 2009 16:54:24 GMT
It is unlikely to be the EP90 as long as you have drained and refilled with ATF. The pressure relief valve in the pump may have stuck/filter in reservoir blocked- if you are lucky. How do you know it is pumping Follow test/strip down per WSM  |
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Post by Phil Nottingham on Sept 20, 2009 16:57:03 GMT
Dave please move this thread to P5B Mechanical
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Post by Deleted on Sept 20, 2009 19:06:38 GMT
It is unlikely to be the EP90 as long as you have drained and refilled with ATF. The pressure relief valve in the pump may have stuck/filter in reservoir blocked- if you are lucky. How do you know it is pumping Follow test/strip down per WSM Thanks for that,yes I did drain refill and bleed I have the burnt finger to prove it, The pump is pumping because I disconnected the high pressure lin eback to the steering box and started the engine so it is pumping but at what pressure? th e failure was very quick is that usual for pump failures? |
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Post by Phil Nottingham on Sept 20, 2009 19:49:41 GMT
No - although the pump does run at extremely high pressures up 700 lbs sq in
I assume you have the 3 litre as the dyno drive can fail and slip?
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Post by Deleted on Sept 20, 2009 19:58:45 GMT
No Sorry P5B, I am on the point of buying a recon pump from JRW but want tobe reasonably sure that is the problem
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Post by Colin McA on Sept 21, 2009 17:29:11 GMT
Check for blockages in the hose to the pump.
I had a blockage and therefore no power assistance. If you look in to the feed at the pump with the hose removed you will see the pump rotating when the engine is turning over.
Make sure that the fluid can flow through the hose from the resovoir.
Colin
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Post by Deleted on Sept 24, 2009 22:19:25 GMT
Colin Thanks for that But the pump is pumping I took the pressure hose off! I am going to check the pressure release valve and then bite the bullet and order anew pump Thanks again Doug
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Post by Phil Nottingham on Sept 24, 2009 22:32:57 GMT
It may be the box though - pump failures lead to noise and will generally give some assistance - will the box still turn the wheels with engine off?
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Post by Deleted on Sept 25, 2009 16:40:33 GMT
Yes ,but it is very stiff and seems to be easier once you have some lock on. The failure was very sudden which makes me wonder of it is a valve or blockage,Whist I was restoring the car The power steering was featherlight as indeed it was at its MOT!!I have stripped down the Flow control valve and as far as I can judge it is in good condition no wear on the valve body.three questions really before I try a new pump. with the front wheels off the ground it is no easier to turn,is that right?
There wa s no noise from the pump and it is pumping ,why should it fail?
The steering box itself does not seem to be leaking but of course I hav e only driven it 20 miles since its MOT so I can't really tell ,There is no liquid around it .
Thanks again for all the help I don't want to waste money on a pump if its the box obviously.
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Post by Deleted on Sept 25, 2009 16:42:36 GMT
PS I hav e also renewed the filter
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Post by Colin McA on Sept 25, 2009 16:47:17 GMT
Did you disconnect the track rod ends? It is not unknown for these to cause stiffness. if you that one off you can try the steering.
Also if the front end is off the ground is the steering still heavy?
If the pump is pumping then why buy a new pump?
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Post by Deleted on Sept 25, 2009 18:55:48 GMT
Colin , Yes still stiff off the ground but I have done all the track rod ends etc as I have only just put it back on the road and it was A OK at the MOT . Thanks anyway I am trying to avoid spending on the pump if it is the box .
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Post by Phil Nottingham on Sept 25, 2009 19:02:31 GMT
Wheels lifted it should be easy to turn wheels by hand - the box looks to be semi-seized. Disconnect drop arm from track rod - Centre tie a longish rope through the hole and pull - it should move slowly at first and speed up as the variable ratio/friction overcomes.
The P5 boxgives incredibly light steering on a P5B as it was designed for a far heavier front end with the bulky/heavy CI IOE straight 6 3 Litre.
If you can get a known good S/h pump this would settle it - if swarf has come from either and circulated both will be ruined so I would not try a new pump on the old box until you have verified its OK
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Post by Deleted on Sept 25, 2009 21:38:30 GMT
Many Thanks I will try that before anything else. I have seen no swarf in the fluid , and I have drained out the reservoir and changed the filter . I have anothe r pump if its good or not I don't know . I will proceed as you suggest and then decide what to do based on how the box feels .I am still baffled by how quiclkly it went.Thanks again for your help ,I will post results Monday
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Post by Deleted on Sept 28, 2009 18:53:17 GMT
Power steering saga continued
I have now carried out the test you advised. I disconnected the track rods and tied the rope through one of the the holes in the drop arm ---- I applied my 15 stone to it and could not move it , I then put a large diameter pipe over the drop arm end and heave don that same result .
I am now removing the box and curious to relate I am thinking that when i took the hoses off the steering became easier and the box made slurping and pumping noises ?
I will complete the removal tomorrow It seems there are three chassis bolts holding the box not two as I read elsewhere ! I hav ealso snapped up a "bargain" box on E bay which I can fit and try. I am going to check above situation tomorrow ,both hoses are dripping fluid so I cant see why removing them could make any difference any ideas?
Thanks Doug
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Post by westoz on Jun 27, 2020 7:48:08 GMT
Hi there. What was the outcome of your investigation? My power steering did exactly the same today. Total loss of assistance and very stiff to turn. I was driving on corrugated road when it occurred. Managed to limp home with very stiff steering.
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Post by johnwp5bcoupe on Jun 27, 2020 8:32:25 GMT
Hi there. What was the outcome of your investigation? My power steering did exactly the same today. Total loss of assistance and very stiff to turn. I was driving on corrugated road when it occurred. Managed to limp home with very stiff steering. First you need to establish if your pump is working ok? belt slipping? If that is ok there are several reasons why the box may not be working from dirt, pieces of rubber blocking the springs in the spool O ring failure etc all of which will mean the box being stripped down  |
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Post by lagain on Jun 27, 2020 19:32:26 GMT
Is the fluid OK ?
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