1976 Evinrude 40HP outboards Service Manual, Page 48Get this manual
DISASSEMBL OF POWER HEAD aRemove lift bracket, cylinder head and cylinder head gasketRemove by-pass covers and gaskets, and inner and outer exhaust covers and gasketsSee Figure 5-6
If pitting exists on the inner exhaust plate,
be certain to install new plate upon reassemblybLoosen clamps and remove oil return hose from crankcasecDrive out taper pins from back to front of crankcaseSee Figure 5-7Remove eight small, large, and two Allen screws attaching crankcase to cylinder blockSee Figure 5-9Tap top side of crankshaft with rawhide mallet to break seal between crankcase and cylinderSee Figure 5-8Lift crankcase from cylinder blockRemove lower main bearing seal housing and large retaining ring Use OMC Special Tool (part No 303859)See Figure 5-10dRemove recirculation valve cover from crankcase fO'r cleaning and inspectionSee Figure 5-9Figure 5-9Crankcase Screw Locations