M104 water pump replacement
 

at 60k miles the waterpump on my e320 coupe started weeping. i plan to install a new pump this weekend. should any additional parts such as belt tensioner, pullys, adjustment rod or tensioner shock be changed as preventive measure??? on the way i will tackle the front cover gasket as it weeps oil.(hope it is not the head gasket) ay input i appreciated!
thx,
reinhard