So i took out the screw and gave it a clean.
Sorted!

Moderators: Doone, westonwarrior
haydn callow wrote:Baz...I seem to remember you have had this problem before.......there are now 1000's of these screws been fitted ...some for almost 5 years with no problems at all....It makes me wonder if you haven't got a underlying problem within the coolant. It should not be happening........I will see you at Stourport and have a look and fit a new screw for you.