1991 Johnson/Evinrude EI 60 thru 70 outboards Service Repair Manual P/N 507948, Page 158Get this manual
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37 Check condition of thermostat seal the seal, use Puller Bridge PN 432127 and OMCSmall Puller Jaws PN 432131 "
with Gasket Sealing CompoundPosition the gasket and relief spring42 Instal