1974 Johnson 40 HP Outboard Motors Service manual, Page 47Get this manual
DISASSEMBL OF POWER HEAD a Remove lift bracket, cylind er head and cylind er head gasketRemove by-pass covers and gaskets, and inner and outer exhaust covers and gaskets See Figure 5-6
If pitting exists on the Inner exhaust plate, be certain to install new plate upon reas-
semblybLoosen clamps and remove oil return hose from crankcasec Drive out taper pins from back to Cront of crankcase See Figure 5-7Remove eight smalllarge, and two Allen screws attaching crankcase to cylinder blockSee Figure 5- 9Tap top side of crankshaft with rawhide mallet to break seal between cran kcase and cylinder See Figure 5-8Lift crankcase Crom cylinder blockRemove lower main bearing seal housing and large retaining ringUse OMC S)lecial ool (Part No303859)See Figure 5- 10d Remove recirculation valve cover from ankcase for cleaning and inspection See Figure 5-9Figure 5- 9Crankcase Scr Locations