[Scrrem]

The dipstick tube attaches to one of the manifold bolts, to access the bolt, it may require removing the fender skirt. Once you do that, I believe you can loosen the bolt (may have to remove it, can't remember). and pull out the dipstick tube. The seal should stay attached to the tube when you remove it. Try to clean around the plug area before removing the tube so you don't accidently push a bunch of gunk into the dipstick tube hole when cleaning and re-installing. Clean up the tube, install new seal and push firmly into the hole in the block. Try to keep downward pressure on the tube while tightening up the tube bracket.
Rich