Having a head pressure to prevent cavitation - that makes sense. So the restrictor is necessary to prevent it. John On 7/11/2012 11:43 AM, Pat wrote: >>From Googling around it seems that high flow rates cause cavitation in the > pump which makes the noise. > I guess the pump likes to see some head pressure to run quietly. > BTW, this isn't a Vanagon specific problem; I got this info from a Maxima > board. > A link to a hose repair shop says this is a common problem on European and > Asian makes. > But, a Chrysler minivan forum also brings up the issue, so I would say it's > almost universal. > > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of > JRodgers > Sent: Tuesday, July 10, 2012 8:08 PM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: power steering > > Larry, I haven't a clue, myself, as to why that restrictor is needed. > But in my own experience, the restrictor must be there. I had to > replace that short pressure hose with the restrictor. I did it with a > hose that had no restrictor. I went through 5 pumps thinking they were > all bad, given the racket they were making, and three of those pumps > were brand new remanufactrure pumps. I sent them all back as bad pumps. > I was totally embarassed when I learned of the fix. Dennis Haynes or > Scott Daniels - can't remember which - told me about having to have the > restrictor else I would have lots of noise like a bad pump. Turned out > to be true. Lots of noise. Replaced the non-restrictor hose with one > with a restrictor, noise was gone. Just my experience. > > John > > On 7/10/2012 6:48 PM, Larry Alofs wrote: >> What is the purpose of the restrictor anyway??? >> >> Larry A. > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2012.0.2195 / Virus Database: 2437/5123 - Release Date: 07/10/12 > > |
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