1997 "EU" Johnson Evinrude 5 thru 15 Four Stroke Service Manual, P/N 507262, Page 167Get this manual
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15Inspect valve housing, spring, and valve for excess wear or damage16Remove oil pan and gasket from powerhead
17Remove two screws retaining thermostat coverCarefully, remove cover and large springDiscard gasket18Remove washer and diaphragm and cup assembly19Remove vernatherm, small spring, and housing tA: