Pulley that comes off is the CRANK PULLEY.
Tensioner is a doddle as it only held on with one large nut of 24/26mm.
Just line up at TDC, after loosening the bolt(crank pulley) and the two alternator belts, 1 power steering belt.
Then remove pulley, this will either be easy and fall off or could be a real battle, if rusty on the crank nose remove woodruff key and use some FINE lapping paste on crank nose to remove rust, also helps it no end to come off easier in future, replace w/key if done this.
There will be a little metal plate(GUIDE) to remove as well, betweeen crank pulley and belt.
Loosen tensioner via bolt that has a weird round bit on it ie outermost one nearest the top hose, rotate the tensioner so belt can be removed.
You may have to remove the TOP HOSE, to be able to remove the tensioner, not sure but think so.
Reverse procedure for putting back together, note carefully EXACT postion of ROTOR ARM, in relation to scribe mark on dizzy body, mark is very small so maybe highlight with tipex, removing the little heat shiled under the rotor arm helps when timing up.
When setting tension, push hard on the long edge towards the tensioner direction and this wil take up any slack that WILL be there, then you will find it goes looser, so have to reset again tighter.
tabetha