1981 Johnson/Evinrude 4HP Outboards Service Manual, Page 73Get this manual
bPump pressure up to 3-6 pounds (21-42 kPa) If pressure gauge indicates leakage, submerge gearcase in water to determine source of leakage as evidenced by bubbles If gearcase pressure gauge does not indicate leakageincrease pressure to 16-18 psi (110-124 kPa) If pressure does not hold, submerge gearcase in water and check for source of leakageMake necessary repairs and repeat testcScrew in vacuum testerPump out to 3"-5" of mercury and see if vacuum holdsThen pump out to 15" of mercury and checkIf gearcase fails to hold on either test, put oil around suspected sealIf leak then stops or oil is drawn in, that seal is defectiveWhen gearcase checks out OK, refill with lubricantSee Section Lubrication ChartReassemble propeller slip clutch without lubricantApply light film of OMC Triple-Guard Grease to the propeller shaft and install the propeller, using new drive and cotter pins Figure 6-40Filling Weedless Gearcase
LOWER UNIT ADJUSTMENTS
TILTING FRICTION
INSTALLATION OF WEEDLESS GEARCASE