I recently picked up a Champion 400 hand cranked blower. When I separated the 2 sides on the fan section to clean it up, it was so gummed up with dirt and grease that I couldn't tell if there had been a gasket between the 2 sections. Does anyone know if there is supposed to be a gasket or some type of seal between the sections?
Also Can anyone advise me about what weight oil I should use and how full the gear box should be? Thanks

On my Canday Otto blower there was an O ring type gasket that was totally brittle and broke in a million pieces when i took it apart. I used a leather shoe lace to replace it.

Joe if you mean the 2 sections of the fan housing, I have used thick paper to make a gasket. I have also used window glazing. Depending on your location, cold weather states, I'd use 30 wt non detergent ( Phillips Super HD is what I use ). Warmer weather some folks use 50 wt. but if live up here ( Iowa ) that will mean HARD crankin.

My fan housing had paper about like thin poster board with something similar to old Permatex gluing it together. Was a real b@#$% getting it apart the first time.