Salam all PWs
My civic started making GHOOOON GHoooon noise with acceleration a few days back. I went to my mech, he diagnosed it to b the timing belt tensioner bearing. i was not convinced, so i told him to remove the power steering pump belt & drove the car for a day & there was no noise.
Later it was diagnosed as the bad power steering pump pulley bearing. the bearing was changes & for that whole the PS pump needs to b disassembled. after the bearing change the noise vanished. i drove the car to my home & parked it 4 the night. next morning i started the car & the PS pump started giving a loud grinding/ zooon zooon noise as it was low on oil. i checked the oil level it was ok & there was no leakage. But the strange thing is that there r numerous small bubbles in the PS oil in the bottle.
I researched the internet & found out that PS pump is sucking air from somewhere so air is causing the bubbling & the noise.
I changed all the rubber o-rings but nothing helps. The oil is clear & no sludge is there.
I m using Zic oil for PS & never had a problem before with it. My mech told me to put in a small amount of engine oil in PS fluid as it is too thin but i m not convinced with his logic.
The pump's inner parts were put back very carefully as per the Service Manual & there was no visible damage or scratches on any inner part. all new & shiny. The PS system was also flushed b4 putting in new oil so there is no blockage as well.
plz giv ur suggestions. To me the problem is of air getting into the system but from where?
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