[charlieh]

Many thanks Guys,
I have been working away this past month, but back on the case again and seeing what after market fans are available in South Africa. I am certain that an efficient shrouded fan/fans are what I need, as when the airflow increases with speed, then the engine runs perfectly cool and I have no problem. I will update again once I have obtained and fitted replacement units. Sadly we lack the choice of after market parts so hunting around is more time consuming - but is part of the fun! Thanks to all for their comment and advice so far. I hope that many owners will find this topic and content useful.