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Gtir Motorsport club » Tech room » Help and Advice » Power Steering Issue

Power Steering Issue

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1 Power Steering Issue on 14th February 2019, 10:57 am

Marcello

Marcello
ey guys,



for a while I have had power steering issue leaking from the low pressure hose in the past and noisey pump.





today replaced the pump and low pressure hose with just a aftermarket normal hose and the new pump is noisey and I still don’t have power steering.


almost seems air is not bleeeing out



any ideas this is getting frustrating



thanks

2 Re: Power Steering Issue on 14th February 2019, 12:04 pm

mike74

mike74
You absolutely sure its the pump(s) to fault and not the rack, or a blockage somewhere?
Was it a brand new pump you fitted?
Have you listened to the pump using a screwdriver as a stethoscope to verify that's where the noise is coming from? (ie not the rack or water pump!)
Have you turned the steering lock to lock a few times to bleed the air out?

3 Re: Power Steering Issue on 17th February 2019, 4:39 am

Marcello

Marcello
@mike74 wrote:You absolutely sure its the pump(s) to fault and not the rack, or a blockage somewhere?
Was it a brand new pump you fitted?
Have you listened to the pump using a screwdriver as a stethoscope to verify that's where the noise is coming from? (ie not the rack or water pump!)
Have you turned the steering lock to lock a few times to bleed the air out?


Well i cant be 100% sure what it is.
Pump was reconditioned from Bob..

I have bleed the air out multiple times now i have got it to this stage.

Power steering functions fine now with no noticeable noise when driving the car and its feeling great, however

when i am at idle and turn the wheel or parking under 2000 rpm , its almost like i have no power steering and i am hearing loud noises .

But when i bleed the car under 2000 rpm when jacked up and i turn the wheel to bleed i am not hearing any noises, its to only occur under the car's weight load under & under 2000rpm the system has an issue.


Crying or Very sad

4 Re: Power Steering Issue Yesterday at 9:34 am

Marcello

Marcello
Video to Show



5 Re: Power Steering Issue Yesterday at 11:50 am

mike74

mike74
That's weird, sounds like a belt rubbing almost?!
Are you sure its coming from the pump and not the rack itself? Maybe the seal on the internal piston is letting fluid past, hence why there's not enough pressure below 2000 rpm?

6 Re: Power Steering Issue Yesterday at 3:46 pm

Mr B

Mr B
gtir technician
gtir technician
Well seems it seems work fine once pump at higher rpm one would assume pressure low either from pump rotor/housing worn or other internal fluid bypass keeping pressure low until pump speed high enough compensate the loss .
Other area check is pulley to shaft & belt drive .
Most common issue is worn pump rotor assembly and pressure bypass valve possibly not seating enough at low rpm .
First thing do is see if noise at pump or rack (use a screwdriver as stethoscope)as may help you make decisions on what at fault .
Other thing do is compare current faults to what had with previous pump, recon/used tends be good way get a headache .
Swapping out or building up a pump from a newer donor pump be easier/cheaper than messing with the rack (not seen much issues on racks but piston seal or port assembly could be an issue)
What I done once was build a R pump using parts from a 10yr younger pump from a 10yr younger nissan pickup (loads of nissans right up to late 2000's got same internals)

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