1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 315Get this manual

1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 315

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3A leak path is created between the UP side of the cylinder and the reservoir when the spool sticks holding the pilot valve open 6 Inspect for nicked, deteriorated, or misplaced O-ring

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