To reinstall, scrape the sealing surfaces on both the housing and cover so it’s clean and smooth, then use a gear oil safe silicone gasket material. My preference is for Permatex brand silicone, but Right Stuff is another very popular brand. There are several schools of thought on applying silicone, but the way I like to do it is by applying a thick ring all the way around on the housing, then smearing it around with my finger to make sure the entire surface is covered. Another method is to apply an even approximately 1⁄8-inch-thick bead down the center of the sealing surface, applying a ring around each bolthole, and then bolting the cover on. Either way, once torqued down to 30 ft-lbs, the silicone will spread out to fill any imperfections and give a good, leak-free seal.