2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 358Get this manual
NOTE: Care should be taken that the alignment pins are installed in the right-side cover 23Using the oil filter wrench, install new oil filter20Place the gasket and right-side cover into position making sure the release roller gUide remains correctly positioned and that the water pump drive adapter aligns; then install the fifteen cap screwsNote the proper location of the long cap screw with rubber washer
24Install the coolant hose on the water pump and secure with the clamp