1978 Johnson 175, 200, 235 HP Outboard Service Manual, Page 94Get this manual
gCheck for binding between the crankshaft and the bearings by rotating the crankshaft with the flywheelSee Figure 5-75 Figure 5-76AChecking Alignment Between Cylinder Block and Inner Exhaust Cover Figure 5-75Checking for Binding hTorque all crankcase screws, beginning with the center mainsSee Figure 5-76Also, torque upper and' rower crankcase head and bearing plate retainer screwsSee Section for torque specificationsiRemove cylinder headsj235 hpInstall inner and outer exhaust covers using new gaskets and OMC Gasket Sealing Compound
REASSEMBLY OF POWER HEAD TO EXHAUST HOUSING
aMake sure gasket surfaces of power head and power head adapter are cleanSee Figure 5-'1'1Place new gasket in position on the power head adapterInstall new "0" ring on driveshaftRemove stud nuts from power head
NOTE 235 hpWhen tightening exhaust housing screws be sure to maintain alignment between cylinder block and inner exhaust coverSee Figure 5-76AIf these two surfaces are not perfectly flush, exhaust leakage will result