Hi I have cleaned and changed filters on my Pierburg secondary air pump and it still sounds like a sick cat crying. Has anyone lubed the bearings WD 40 and run bench power to the pump and had any luck? I have searched the net and found limited info on this pump. Thanks in advance
Below you will find a link to Pierburg
Ernie


http://www.ms-motor-service.com/xima...012_en_web.pdf

 

WD40 is the last thing I would try, it will just take out the bearings, if you want to do something like this find some specialty type of lube.