1990 Johnson Evinrude "ES" Cross V 88 thru 115, 150 thru 175, P/N 507874, Page 349Get this manual
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1491 31e!J
Remove the high pressure port O-ring
501 32 Remove the trim-down relief valve and springr-:;l 33 Clean and inspect the components of the trim-down pump relief valve Replace the rubber sealif necessaryThe seal can be easily removed from the valve with your fingernailPress new seal in place with the ridge facing out
521 34 Remove the spring from the expansion relief valve35 Remove the expansion relief valve core Remove the expansion relief valve seat
1551 37 Clean and inspect all the components of the expansion