1970 Evinrude Ski-Twin, Ski-Twin Electric 33 HP Service Manual 4687, Page 48Get this manual
NOTE Re-torque cylinder head scr ews aft er otor test ha been completed and motor has cooled comfortable to touchgReplace inner and outer exhaust coversusing 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 pliersOIL DRAIN VALVE The oil drain valve ordinarily requires little or no attention; however, when the motor is being serviced, remove and clean the oil drain valve plate and screen assemblySee Figure 5-29bIf gum or varnish is found in the crankca se during servicing, clean the leaf valve in OMC Engine Cleaneras it is likely that gum and varmsh have also been deposited there cMake sure that the leaf valve seats against the leaf plate, and that the screens are not cloggedReassemble and installSee Figure 5- 29Check space between leaf and leaf stopBend leaf stop for proper clearance of .040"
bPlac power head on exha ust housing, uSing care to void damaging the ends of the crankshaft and driveshaftRotating the powe head slightly clo ckwise as it is lowe red onto the exhaust housing will engage the splinesc Replace two nuts and eight screws tta ching powe head exhaust housing assembly dRepla ce armature plate support nd retaining ring Replace port and starboard sta rter mounting brackets Replace shifter lock and shifter lock springand replace throttle control armfReplace carburetor and other components of fuel system as described in Section 3