1999 Volvo Penta "WT" Models Workshop Manual, Page 59Get this manual
5When taking the final cut with boring bar, leave 0.001 in(0,025 mm) on the diameter for finish honing to give the required position to the cylinder clearance specifications(The honing or boring operation must be done carefully so the specified clearance between pistons, rings, and cylinder bores is maintained)Honing 1When honing the cylinders, follow the hone manufacturer's recommendations for use, cleaning, and lubrication during honingUse only clean, sharp stones of the proper grade for the amount of material to be removedDull, dirty stones cut unevenly and generate excessive heatWhen using coarse or medium grade stones, use care to leave sufficient metal so that all stone marks may be removed with the fine stones used for finishing to provide proper clearance2Occasionally, during the honing operation, the cylinder bore should be thoroughly cleaned, and the piston selected for the individual cylinder checked for correct fit3When honing to eliminate taper in the cylinder, make full strokes of the hone in the cylinderAlso check measurement at the top, middle, and bottom of the bore repeatedly INote Handle the pistons with care and do not attempt to force