1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 227Get this manual
Cleaning and Inspection 1Clean all parts with parts cleaning solvent and dry with compressed airAll nut and screw threads coated with OMC Screw Lock or OMC Nut Lock must be thoroughly cleaned before assemblyWhen using thread locking product, be sure to prime the adhesion surfaces with OMC Locquic Primer2Discard all seals, a-rings and gaskets3Examine the upper and lower thrust mounts and replace if deteriorated or damaged4Before checking the exhaust housing for distortion, thoroughly clean the top and bottom mating surfaces and remove all sealer and corrosionr::;l 5Check parallelism of the exhaust housingPlace the housing on surface plateUsing dial indicator check flatness by measuring the run-out on the top edge of the housingThe maximum allowable run-out is 0.009 in(0,228 mm)DO NOT attempt to straightenIf the housing is distorted, replace itIf the required equipment is not available, consult local machine shop