1997 Johnson Evinrude "EU" Accessories Service Manual, P/N 507270, Page 143Get this manual
12Slide the piston and rod assembly into the cylinder but do not engage the threads of the capSet the assembly aside at this time13Remove the three oil reservoir retaining screws with washersRemove the oil reservoir from the manifold
14Clean and inspect the oil reservoir, retaining screws, washers, and O-ringReplace any components necessary15Remove the three screws reservoir filter
, manifold plateand
16The three screws for the manifold plate each have flat washer and lock washerClean and inspect all components of the manifold plate, paying particular attention to cleaning of the reservoir filter17Remove the filter valve seat by threading one of the manifold screws into it and then pulling it outDiscard the filter valve seat and O-ring18Located under the filter valve seat is steel check ballRemove the ball from the manifold using magnetic tool