1978 Evinrude Outboards 9.9/15HP Service Manual, Page 81Get this manual
8 Inspect exhaust housing for nicks on the machined surfacesRemove nicks and re-surface faces on surface platestart with No120 emery and finish with No180Check parallelism on plate with surface gage and scriberSee Figure 6-13A drill press table will also serve, using the spindle as gageDo not attempt to straighten, replace if bent
Figure 6-14Installing Pivot Tube Seal
Figure 6-13Checking ParallelismfAlI'NOTE
A bent exhaust housing may cause upper driveshaft splines to wear excessively, damage crankshaft splines, and break driveshaftInspect exhaust housing upper shift rod grommet for wear or deteriorationReplace if necessary5
Figure 6-15Lower Pivot Shaft Bushing Install upper mounts with screws dipped in OMC Gasket Sealing Compound (Part Number 317201)Place upper mount seal on steering bracket, and carefully install exhaust housing with linkNOTE Using extreme caution, install two screwsBe careful not to pinch or tear sealSee Figure 6-10Torque screws to specifications, Section 2