1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 188Get this manual
CAUTION If crankcase cover and cylinder block is to be submerged in very strong cleaning solution, it will be necessary to remove the crankcase cover cylinder block bleed system from covercylinder block to prevent damage to hoses and check valves
Cylinder Bores
1Inspect cylinder bores for scoring, scuffing or transfer of aluminum from piston to cylinder wallScoring or scuffing, ifcan normally be removed by honingIf transfer of aluminum has occurred, an acidic solution such as "TID WL "should be applied to the are as of the cylinder bore where transfer of aluminum has occurredAfter the acidic solution has removed the transferred aluminum, thoroughly flush the cylinder bore(s) to remove any remaining acidC ylinder walls may now be honed to remove any gla and to aid in the se ating of new piston ringsHONING PROCEDURE aWhen cylinders are to be honed, follow the hone manufacturer 's recommendations for use of the hone and cle aning and lubrication during honingbF or best results, continuous flow of honing oil should be pumped into the work are aIf pumping oil is not practical, use an oil canApply oil generously and frequently on both stones and work are a