1968 Evinrude Speedifour, Starflite 85HP Service Manual, Page 71Get this manual
Re-surface and inspect outer exhaust housing in like mannerReplace if bentNOTE: bent haust housing cause driveshaft splines to wear excessively, and also damage crankshaft splines Check water intake screen and clean removing by-pass Check exhaust outlet and replace gasketleaking gasket here wiH pass exhaust gases into the cooling system, causing over-heating and pre-ignition
Inspect water tubes for obstructions kinks which restrict water flowCheck opening of 332 inch holes in inlet water tubeThis sprays Ilne mist of cooling water the shift and mountsIf it is clogged, serious damage could
fInspect drive gears, pinion gear, and thrust washers for wearInspect driving surfaces of shifter clutch dog and drive gearsIf chipped badly worn, replace them to avoid possible jumping out of gearChipped driving surfaces and exceptional wear indicate improper shifting practice operator of motor