1990 Johnson Evinrude "ES" 40 thru 55 Service Repair Manual, P/N 507872, Page 193Get this manual
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Service Chart40, 48, 50
OMC Hi- Vis Gearcase Lubricant: 16.4 floz(485 ml)
96-120 inIbs(11-14 Nm)
See Page 6-3
48-80 inIbs(5-9 Nm)