1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Manual, Page 106Get this manual
Component Servicing
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Oil Supply Hose and Pickup Assembly
If you suspect that the oil supply to the check two areas:
1Remove the pickup assembly and inspect for clogged or contaminated filter Remove the four No25 Torx screws and remove the pickup assembly from the reservoir Carefully remove the pickup filter and flush with mild solvent to remove any contamination Install the filter, being careful not to move the pickup assembly on its support rods12306
2With the pickup assembly out of the reservoir, vacuum test the system to check for air leaks Carefully remove the oil hose from pickup assembly and from engine oil inlet fitting Use low pressure air to purge hose of oil Use Cap Holder PIN 329661 to plug pickup end of hose Attach vacuum tester to the engine end of oil line and draw inHg vacuumThe oil system is good if it can maintain inHg vacuum for at least five minutes12307