1997 Johnson Evinrude "EU" Accessories Service Manual, P/N 507270, Page 145Get this manual
26Remove the high pressure port O-ring
27Remove the trim-down relief valve and spring
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
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29Remove the spring from the expansion relief valve30Remove the expansion relief valve core31Remove the expansion relief valve seat