I know - strange title right. First off, I canít take an credit for this (Potentially) brilliant idea. @antherzoll mentioned it to me and before he had a chance to try it I jumped on it.
So here the deal: many of our XC70s suffer from steering thatís on the heavy side. A very small number of us (maybe only Antherzoll) have slammed an XC90 front suspension into our XC70. This results in steering system having to work harder. If you tow, steering is also tougher.
Well it turns out that the XC90 pump is the same pump except for the pulley. The XC90 pulley is smaller. Iím addition the aux belt is same for both models. This results in more pressure being generated in the system as the smaller pulley spins at a higher rpm (roughly 9% faster).
So with this info in hand I decided to give this Antherzoll idea a shot. Went to yard and got a first pump. Installed. But I got strange knocking noises from it. See clip.
Then I refused to give up and went to second yard and got a second pump. Worked silently for a few min and then knocking...again.
So got myself a cheap mechanics stethoscope and poked it around and the noise does seem to be loudest on the pump.
I also tried taking the xc90 pulley only off the doner pump with an autozone ps tool. Got one gear off but could not get other off. I would not recommend trying this unless you have proper volvo tool whatever it is.
Oh but hereís the good part. Even though itís noisy the steering is just beautiful. I can properly steer with index and thumb with moderate pressure and turning is so much smoother. Note that I had previously installed a ps cooler from an XC90 so temps rising should not be an issue).
Next step is to put old pump back on on the off chance that this issue was already present and unrelated to pump replacement.
Did I just get VERY unlucky and source two bad xc90 pumps?
Do bad pumps even make a ticking noise? Never heard of such a thing?
Is it possible rack is restricting flow back to pump or something resulting in ticking?
Are there other possibilities?
There is no bubbling, fluid level remains good, and no whining from pump.
2002 V70XC, 2003 V40, 2004 S60, 2010 V70