nosie engine on tickover renault espace 16v 20l 2001?

getting nosie on tickover when worm sounds like the hydrolic tapets
is this a commen fault on this engine and if so what is the best action to fix the problem ie new engine or oil pump

dont whant to put in new hydrolic tapets to find it dose the same thing

also the power steering has gone heavy

dont no if its the rack or the punp that has gone inop

any help