all you do is remove the rocker cover
remove the rocker assembly by undoing all the 10mm nuts
lift the rocker assembly off
lightly tap out the old lifter with a punch through the hole in the top of the rocker
when yuo put the new lifter in just make sure the shim has the dot to the outside
bolt rocker gear back on - tighten up evenly
bolt rocker cover back on
reattach the other bits and pieces off the rocker cover and you are done
i replaced three in about an hour
p.s it might pay to give the rocker assembly a bit of a clean if its dirty(built up muck etc)
Also make sure you plug the oil return galleries (4 on the inlet side) with old newspaper or paper towels before you pull the rocker assembly off. Sometimes a lifter will fall out and next thing you know it's in the sump..... a good source of rude words!
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