I removed my riser to clean it out in the fall,went to reinstal with a new gasket ,went together easy....put antifrezze leaked right out.Tooked it apart put a little high temp permatex...leakedI have a 1984 universal M18 freshwater cooled about 650 hours. I did use the proper universal gasket. I do have a good diesel mech. but I like to try to do things myself. Thanks