1985 OMC 65, 100 and 155 HP Models Commercial Service Repair manual, PN 507450-D, Page 112Get this manual

1985 OMC 65, 100 and 155 HP Models Commercial Service Repair manual, PN 507450-D, Page 112

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2 If leakage persists, drill mm (18") hole through the center of the core plug to depth of not more than 1,5 mm (116") below its surfaceWith punchcarefully pry out the core plug3 Inspect and clean the