Thank you very much,I plan to take out the unit first and have read your posting on this SIerrafery,I assume when I disconnect the pipes they will be empty of fluids etc.sorry if this is a daft question.
I saw on one posting mention of brake fluid loss and could not understand this unless its from the bolt connection to the unit.
I plan to buy the 2 copper washers and get a fan spanner and tool to lock my pulley,it looks very tight to remove bolts and was amazed somebody did it in 25 mins.
I read on your link from the e bay company to take off the unit and check the slip ring.
So will do this,not sure what it is,I called a main stealer who wanted £534.00 for a new unit,Halfords were £356.00,then looked at e bay and saw wide price differences and some warnings online about Chinese copies which fail quickly.i thought if I bought one from Paddock or similar I would get a good one as they seem to sell a Denso unit which is in my manual as a possible original fit tent.
I will get on it when I finish work and update you.
Thank you very much