1993 Johnson Evinrude "ET" 60 thru 70 Service Manual, P/N 508284, Page 343Get this manual
149131Remove the high pressure port O-ring 150132Remove the trim-down relief valve and springr;:;l33Clean 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
152134Remove the spring from the expansion relief valve1531 35Remove the expansion relief valve core1541 36Remove the expansion relief valve seat15537Clean and inspect all the components of the expansion