1990 Johnson Evinrude "ES" 40 thru 55, P/N 507872, Page 294Get this manual

1990 Johnson Evinrude "ES" 40 thru 55, P/N 507872, Page 294

THERMAL EXPANSION RELIEF
1Under certain conditions, external temperature variations can cause the unit's hydraulic fluid to expand2The extreme pressure caused by thermal expansion is vented directly to the reservoir EXPANSION relief valve built into the manual release valve

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