1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 95Get this manual

REASSEMBLY SEQUENCE (DESIGN 1)

CAUTION
Observe position of both Pulse Chamber DIAPHRAGM and GASKETThe two larger holes allow oil injection output to enter the gas flowFailure to reinstall as shown WILL result in extensive damage to engine

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