think this will everythign needing to know, can in piccys is a 1992 1.6 8valve with carb but is rellivant to all 8 valves
1) remove upper cambelt gaurd
2) loosten the camshaft pully retaing bolt (it's tight)
3) turn engine round to number 1 TDC ( fireing ) thins is when the do on the outside edge of the cambelt pully is inline with the frount edge of the rocker cover also rotor arm in dizzywil be point to number 1 ht lead
4) remove model dependant stuff above the rocker cover ( air box in this case )
5) losen and remove alternator and pas belts
6) remove lower pullys 4 x m7 or m8 allen head bolts
7) remove lower cambelt cover
loosten cam belt tensioner and slide belt off camshaft pully
9) tie belt up with sting or bungie strap (optinal keeps intermeadiate shaft intime with cranckshaft )
10) remove rocker cover 8 x 10mm nuts
11) lift off splash gard
12) loosten the 8 x 13mm nut holding the cam caps, at this point you'll notice number 4 cap is missing it's meant to be !!!
13) undo nuts a few tuns at a time so not to put undue stress in any one cap.
14) lift out the camshaft
15) lift out the tappets and disgard ( throw at anoying people )
16) drop replacements in place
17) remove pully from camshaft
18) remove oil seal from camshaft
19) fit new oil seal
20) present the camshaft back to the engine in roughtly the correct position add a littel oil to the
bearing journals
22) refit the cam caps and tighten each one down a few turns at a time in seuquence as would a cylinder head
23) torqe down to 20 NM in sequnece
24) turn cam round to number 1 TDC (fireing) dot on pully should be in same place as before and both lobes on cam pointign skyward.
26) fit new rocker gasket kit
25) refit splash gard
20) refit camshaft pully with lightly oiled bolt
27) refit rocker cover torqe to 10 NM no more
28) slide old cambet over pully,
30) torqe camshaft pully retaing bolt to 80 NM ( useing old belt to hold pully don't do if reuseing belt)
29.5) ether remove and refit belt or slice the old belt in half, disgard the outer half, slide the new belt half on before cuttign and removeing the remaning half of the old belt.
29) retesion belt 90 degree twist on run between cam pully and intermediate shaft,
31) refit lower accsesory pully temporarly ( 2 bolts will suffice ) start enigne, if dosent go recheck timeing on cambelt
32) remove lower pully and refit lower cambelt cover
33) refit lower pully torqe to 20 NM
34) refit upper cambelt cover
35) refit air box and any other crap you removed to get to things
36) go to pub have beer