1978 Evinrude Outboards 9.9/15HP Service Manual, Page 57Get this manual
REFERENCE PICTURE ,WATER TUBE EXHAUST TUBE
Figure 5-7Rubber Mount Screws (Three) dRemove the three rubber mount screws
Illfll NOTE
Power head ground wire installed under port mount screwSee Figure 5-7eLift power head from exhaust housingSee Figure 5-8Place power head on bench in suitable holding fixture such as OMC Special Tool #303605, and remove exhaust and water tube assemblySee Figure 5-9
Figure 5-9Removing Exhaust Tube and Water Tube Assembly