1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 39Get this manual
7Inspect propeller shaft seals for evidence of leakageReplace if necessary8 Drain and refill gearcaseLubricate all components of engine See Lubrication, this section 9 Check propeller condition Replace if damaged 10Retorque all screws and nuts to specifications
11Run engine in test tank with correct test propellerCheck cooling system operation12To remove carbon deposits from combustion chambers and pistons, inject OMC Engine Tunerfollowing directions on canDO NOT allow tuner to soak in engine more than one hourUnusual operating conditions, quality of fuel, or use of non-recommended oil can accelerate the formation of carbon depositsStep 12 should be repeated every 50 operating hours or once each season, whichever is more frequent13Check engine operation by verifying minimum test propeller RPMRefer to Engine Specifications, this Section&