1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 220Get this manual

PUMP REPLACEMENT NO TE: The pu.mp jJ OI rebuildableIf pump i$ defeclive, replace as an aJSembly Remove oil reser voir fro pump adaptor If oil is clea n, retain it in clean con tai ner
Remove Tou scre ws (a) using special Ton socket or 3 16" sockel (You may ha ve to lap the3 16" socket do wn
onto the screw head),

Lfl pump from adaptor

Re move "0" rings (b) 11132" 0.0(.86cm .0 fro m

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