1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Repair Manual P/N 507947, Page 212Get this manual
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32 Fill the gearcase with 16.4 flozs(485 ml) lubricant as follows:
Check from the shift rod hole to surface of the gearcase using Universal Shift Rod Height Gauge PN 389997 with the shift