1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, P/N 507875, Page 427Get this manual
1491 26Remove the high pressure port O-ring 1501 27Remove the trim-down relief valve and springr;;;l 28Clean 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 29Remove the spring from the expansion relief valve1531 30 Remove the expansion relief valve core154 31 Remove the expansion relief valve seat551 32Clean and inspect all the components of the expansion