1988 Johnson Evinrude "CC" 9.9 thru 30 Service Manual, P/N 507660, Page 201Get this manual
24Thoroughly clean and degrease the crankcase mating flange of the cylinder block with GMC Cleaning Solvent and let air dry25Apply Locquic Primer to the mating flange of the crankcase and let air dry160126Apply Gel-Seal II to the cylinder block flangeThe application must cover the flange evenly and consistently without being excessiveThe application must not come within 114 in (6,4 mm) of the labyrinth seals or bearings INote
Gel-Seal II has shelf life of at least one year when stored at room temperatureTest the Gel-Seal II or replace it if the age of the tube can not be determinedUsing old Gel-Seal II could cause crankcase air leaks
27 Lower the crankcase into place28Install the six main bearing screws finger tight29When the crankcase is seated, install and firmly seat the crankcase taper pin 30Install crankcase flange screws finger tight