Replaced power steering pump...
- Thread starter Algypan
- Start date
There doesn't seem to be any restrictions when I flush the fluid through. The guy who sold me the pipe has given me a refund and asked if maybe my pressure release valve is faulty...
I've mentioned this previously but wasn't sure exactly how to test it. So far I've managed to be able to push on the pin in the high pressure side of the pump and it moves freely under spring loaded tension. Could I be missing something else?
Thanks for all the help! This is starting to raise my blood pressure to dangerous levels at the moment
Yeah, that was me
You have no luck do you mate. Have you checked all your other pipes for kinks? Can you trace when the fluid is is heating up? After the pump before it enters the rack? The return from the rack? Can you take the pipe from the pump going to the rack and put it into a container and see if it still gets warm? That would rule out the rack. If it’s a new pump then it would be a restriction in the hoses. I am baffled too
There are three potential causes of raised PS oil temperature;
1. Friction - damaged pump, try disengaging the belt and see if the pump turns freely by hand.
2. Throttling oil through the pressure relief valve, the valve is constantly lifting and the pressure drop across the valve increases the temperature.
3. PRV not lifting when it should while steering is inactive, pump trying to discharge the same oil and no flow.
I’m doing an engine oil service in the next couple of days, I was planning to check and feel how quickly the PS oil temperature increases.
Regarding the second leaking hose; it was probably made is the same way, by the same person with potentially the same defective equipment as the previous hose.
Did the hose manufacturer offer to pressure test the second hose prior to dispatch?
1. Friction - damaged pump, try disengaging the belt and see if the pump turns freely by hand.
2. Throttling oil through the pressure relief valve, the valve is constantly lifting and the pressure drop across the valve increases the temperature.
3. PRV not lifting when it should while steering is inactive, pump trying to discharge the same oil and no flow.
I’m doing an engine oil service in the next couple of days, I was planning to check and feel how quickly the PS oil temperature increases.
Regarding the second leaking hose; it was probably made is the same way, by the same person with potentially the same defective equipment as the previous hose.
Did the hose manufacturer offer to pressure test the second hose prior to dispatch?
Story of my life, Pal.
I have checked other hoses, I have even replaced a couple with new genuine as they were damaged, for example the cooler. I'm really hoping it's not the rack 
Maybe another pump is on the cards... 3rd one in less than a year
The hose should burst before the coupling leaks. The PS pump is a low pressure system, nothing approaching the rating of a typical hydraulic hose. The working pressure (WP) will be marked on the hose skin and the minimum burst pressure will be available in the hose tech’ spec’ online.
That would explain the dirty PS fluid that you flushed out.
@Algypan
I’ve just had the lower engine cover off my van for an oil service so I took 10 minutes to see if the PS warms up at idle without steering.
From cold after 4 min’s I could just sense a change in temperature, for the further 6 min’s I couldn’t detect any further rise in temperature. Certainly not even warm let alone too hot to touch.
In your case I’d advise removing the pump, disassemble it and investigate what it wrong. I would think it is oil paper and O ring joints so if you are careful it should go back together OK.
I’ve just had the lower engine cover off my van for an oil service so I took 10 minutes to see if the PS warms up at idle without steering.
From cold after 4 min’s I could just sense a change in temperature, for the further 6 min’s I couldn’t detect any further rise in temperature. Certainly not even warm let alone too hot to touch.
In your case I’d advise removing the pump, disassemble it and investigate what it wrong. I would think it is oil paper and O ring joints so if you are careful it should go back together OK.
Here we go again, ladies and gents... 
So I'm about to order another new pump and another hose. Is there anything I should do before sticking them on and filling it with fluid, firing it up and bleeding? This whole ordeal has made me nervous and doubting myself as I don't want to risk wrecking another pump and bursting another hose for whatever reason.
The thing that worries me is that the old pump pretty much boiled the fluid due to what I can only imagine was a faulty pressure release valve or a blockage from before I installed it and the new hoses. I have now taken off and returned that pump and binned off the new damaged hose, and have replaced the cooler and the pipes going to and from the reservoir. How can I be sure that when I stick the new pump on and fire it up that I'm not going to have some kind of potential blockage again?
I wanted to check that I hadn't damaged the new rack that I installed last year by pulling the boots off and seeing if there was any fluid in the boots but they were dry.
As always... thanks for the help!
So I'm about to order another new pump and another hose. Is there anything I should do before sticking them on and filling it with fluid, firing it up and bleeding? This whole ordeal has made me nervous and doubting myself as I don't want to risk wrecking another pump and bursting another hose for whatever reason.
The thing that worries me is that the old pump pretty much boiled the fluid due to what I can only imagine was a faulty pressure release valve or a blockage from before I installed it and the new hoses. I have now taken off and returned that pump and binned off the new damaged hose, and have replaced the cooler and the pipes going to and from the reservoir. How can I be sure that when I stick the new pump on and fire it up that I'm not going to have some kind of potential blockage again?
I wanted to check that I hadn't damaged the new rack that I installed last year by pulling the boots off and seeing if there was any fluid in the boots but they were dry.
As always... thanks for the help!
