1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 113Get this manual
Connecting Rods NO TE: Photos of connecting rods are not of 30013.4 Litre engine but areor reference OIliyCheck connecting rods for alignment by placi ng rods on surface plateIf light ca be seen under an porti on of machined surfaces, if rod has slight wobble on pla te, or if .002" (O.OSlmm) feeler ga uge can be inserted bet ween any ma chined surface and surface plalerod is ben and must be
discarded
O verheating: Ove rheating is visi bl as II bluish bearing sur fa ce color thai is caused by inadequa te lubrication or exces sive RPM
Ru st: Rust for mation on bearing surfaces cau ses uneven pit ting of surface(s)