1990 Johnson Evinrude "ES" Colt/Junior thru 8 Service Manual, P/N 507870, Page 135Get this manual
Overheat InspectionAll Models If the engine has overheated, the following items should be checked to prevent further damage1Check the water cover and exhaust cover gaskets for leakage2Remove the cylinder headInspect the pistons, rings, and cylinders for damage3Inspect the cylinder block and cylinder head for warpage
121 4Check the
water passages for damage or missing water deflectors (3Deluxe mo(Jels)