had this on mine the other week.
as daz says, filter off, then the 27mm holding nut for the oil cooler, drain the coolant, remove the hoses from the oil cooler, slide it off the centre spline, then there are 3, 6mm allen key bolts that hold the housing to the block.
mine rounded off

so had to get new ones. space can be limited if you have fat fingers like meÂÂÂ

took me about 40 mins, start to finish
