Suzuki 2002-2005 DF4/DF5/DF6 4-Stroke Outboards Service Manual, Page 135Get this manual
8-14 LOWER UNIT
LEAKAGE CHECK
Check for leakage of the oil seals and O-ring when applying the specified pressure inside of the gearcase09950-69512Oil leakage tester 09952-99310Air pump
Procedure 1Install the special tool into the oil level hole2Connect an air pump into the special tool3Rotate the driveshaft and the propeller shaft clockwise several times and then apply the specified pressure for the test