1992 Johnson Evinrude "EN" 60 thru 70 Service Manual, P/N 508144, Page 336Get this manual
1491 31Remove the high pressure port O-ring 1501 32Remove the trim-down relief valve and springClean and inspect the components of the trim-down pump relief valveReplace the rubber sealif necessaryThe seal can be easily removed from the valve with your fingernailPress new seal in place with the ridge facing out
1521 34Remove the spring from the expansion relief valve1531 35 Remove the expansion relief valve core 154 136 Remove the expansion relief valve seat1551 37Clean and inspect all the components of the expansion