Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 42Get this manual
Inspect connecting rod needle bearing (a) as outlined inCleaning and Inspection" following NOTE: Connecting rod is not removable from crankshaft 4Check all water and fuel passages in cylinder block and crankcase cover to be sure that they are not obstructed 5Check that all fittings and plugs are tightCYLINDER BORE (Cleaning and Inspection)
NOTE: Cylinder sleeve is part of the cylinder block and cannot be replaced1aIf the piston is scored and has transferred al um inum to the cylinder wall, remove all loose aluminum deposits from cylinder wall with stiff bristle brush bIf any aluminum deposits remain, apply small amount of muratic acid (or liquid toilet bowl cleaner) to deposits [DO NOT allow muratic acid (or liquid toilet bowl cleaner) to contact aluminum portion of cylinder block) Leave acid on aluminum deposit for one to two minutes, then wash cylinder thoroughly with hot water and detergent Needle Bearing Pisto PinG" Lockrings Pisto Pin Connecting Rod
d Steps "b" and "cmay require repeating several times before all the aluminum deposits are gone 2Inspect cylinder bore for scoring Minor cyl inder wall scoring usually can be "cleaned up" by honingrefer toHoning Procedure," following Honing Procedure IMPORTANT: If cylinder wall is not scored, hone cylinder just enough to deglaze wall