Goto auto shop. any name. grab a tube of permatex, blue red don't matter. this seals better then sillacone. sronger lasts longer. put a vare thin bead around the cover. NOT to much abut the same as the old seal. Now let that sit over night, be for putting it back together, or it'll be a real pain opening it back up. this will keep everything out. I've dun this more then once. good luck.