I found some images in a old Thread
http://www.peachparts.com/shopforum/diesel-discussion/394392-engine-oil-leak-behind-sls-pump-w124-wagon.html
so the back plat has third hidden 10mm bolt that cannot be removed without removing the asd pump
i already removed the asd pump shaft but still wont move
so after i saw this images i think i have no other choice
unstick the stuck pump or give up and live with the thickin noise forever