FYI all you A4 lovers, I was going to screw in the grease cap to lubricate the water pump
when I thought I better check to see if there was grease in the cap.
When I unscrewed the cap, the whole fitting came out of the pump
. No problem, however upon closer instection I discovered that when the cap was screwed in to push grease into the pump
, no grease was coming out the "nipple" end.
It took several hours of soaking in varsol and careful cleaning with a stiff piece of wire to free up the small spring and ball check valve inside the fitting.
It was plugged solid with old grease so any time I tried to lubricate the pump
none was going in. After freeing up the ball check valve there is lots of grease coming out of the "nipple" end so I know I am getting grease where it is required.
It would be worth checking as part of your annual maintenance.