1973 Evinrude Norseman 40 HP Service Manual, Page 49Get this manual
Re-torque cylinder head screws after motor test has been completed and motor has cooled comfortable to touchgReplace inner and outer exhaust covers, using new gasketsInstall all screws finger tight before tightening to specified torqueReplace bypass covers, using new gasketsUpper bypass cover has tapped holes to provide for mounting of fuel pumphInstall oil return hose on crankcase, and tighten clamps with' pliersFUEL RECIRCULATING SYSTEM aThe fuel recirculating system ordinarily requires little or no attention; however, when the motor is being serviced, remove and clean the cover plate and screen assemblySee Figure 5-29Check hoses from cover plate to by-pass coversbIf gum or varnish is found in the crankcase during servicing, clean the cover screens and check valves in OMC Accessory Engine Cleaner, as it is likely that gum and varnish have also been deposited there
bTurn crankshaft to bring Noone piston to top deadcenterTurn driveshaft so impeller key location faces aftSee Figure 5-29AcPlace power head on exhaust housing, using care to avoid damaging the ends of the crankshaft and driveshaftRotating the power head slightly back and forth as it is lowered onto the exhaust housing will engage the splines