1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 317Get this manual

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Leak Down CheckPilot Valve Assembly 1 Debris or chips between valve and seat (a), usually imbedded in rubber valve seat2 Pilot valve installed from non-chamfered end of spool, results in nicked or dam

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