Hello, I am new here. Purchased a 1971 R4 a couple of months ago to work on with my lad. Noticed a radiator issue, decided to replace, heard a thump as we removed the fan shroud - a couple of washers and a nut fell out!, now see this came from the water pump, and punctured a hole in the back of the radiator. Unsure how important that nut is, its in the centre of the fan, and after a look in Haynes , looks to be the nut at the end of the impeller maybe. While the radiator is out and not knowing if the pump will still perform, it seems to make sense to put a new pump on and be done with it. Now looking at new pumps on the usual websites, the pumps they recommend for the 1971 845cc look a little different, they dont show the nut (now ex-nut). Anyone had a sheared nut themselves? anyone else bought another pump I mention?, also is there a torque setting when I put the new pump back on?. Grateful for any advice/input. We are new to this, - major job for us to tackle!
NIck.
NIck.