1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 260Get this manual
9-7 LOWER UNIT
INSPECTION
NOTE: If any component is worn excessively, cracked, defective or damaged in any way, it must be replacedNOTE: Thoroughly wash all metal components with cleaning solvent and dry with compressed air
Wear safety grasses when using compressed air