After installing the turbo inlet on my wife s wagon the steering started whining groaning.
Subaru forester power steering pump o ring.
No need for a new pump.
Do not start the engine until the system is fully bled doing so may cause damage to the power steering components.
Slip the new o ring on the fitting.
This is a common problem after installing the new turbo inlet.
I replaced o ring of the power steering pump of my outback 2008 which was whining in cold weather.
Replace all hose clamps with new clamps 3.
O ring fit perfect.
I installed the new o ring and swapped out the power steering fluid and this resolved the whirring sound problem.
Installed a few days ago in 2016 wrx sti.
The o ring was too thin and power steering fluid was leaking from the join even before i started my engine.
I later ordered genuine part 34439fg000 from subaru dealer.
Subaru o ring 34439fg000 for 03 08 foresters.
This o ring is most likely interchangable between many models but always check for a vehicle specific part.
High pitched whirring when turning the steering wheel was my issue.
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Pump internals are metal to metal so any air in the system can cause metal to metal contact and resulting damage.
How to bleed subaru power steering systems.
Replace and tighten the 10mm bolt.
Re seat the fitting and other bracket pieces to seal the reservoir.
Oem subaru power steering pump connector o ring impreza sti legacy 34439ae021.
The air being pulled into the pump will cause a lack of power steering and buzzing noise as the air disrupts the fluid.
If it still squeaks after the o ring swap you may have excess air in the power steering system and may need to bleed it.
Unfortunately this 4 fix didn.
Replace the fan belt shroud an tighten the 10mm bolt and 10mm nut.
Car is good to go.