TM 9-2320-272-24-4 - JATONKAM35s HOME ON THE WEB

TM 9-2320-272-24-45-7. CYLINDER LINERS AND BLOCK MAINTENANCE (Contd)1.2.3.4.5.6.7.8.9.10.11.12.13.WARNINGDrycleaning solvent is flammable and toxic. Do not use near openflame and always have a fire extinguisher nearby when solventsare used. Use only in well-ventilated places, wear protectiveclothing, and dispose of cleaning rags in approved container.Failure to do this may result in injury or death to personnel and/ordamage to equipment.Clean engine block (1). Refer to para. 2-14 for general cleaning instructions.Run rods (3) with brushes through all oil passages (2) in engine block (1).WARNINGEyeshields must be worn when cleaning with compressed air.Compressed air source will not exceed 30 psi (207 kPa). Failure todo so may result in injury to personnel.Blow oil passages (2) of engine block (1) clean with compressed air.Clean water pump air bleed hole (4) in cylinder bore (5) with compressed air.Blow all dirt and cleaning solvent from all engine block (1) screw holes (7).Remove scale from liner counterbore ledge (6).Clean carbon from lower liner bore (8) of engine block (1).NOTEEnsure engine block is on flat surface or workbench for inspection.Refer to para. 2-15 for general engine block (1) inspection instructions.Check engine block (1) for worn surfaces, pitting, corrosion, nicks, gouges, burrs, eroded waterholes,damaged threads, distortion, and cracked areas.Inspect counterbore ledge (6) of cylinder liner counterbore (9) at points (A) and (B) to ensurecounterbore ledge (6) is 90° to liner bore.Check counterbore diameter (A) and depth (B) to insure proper seating of cylinder liner and todetermine if machining of counterbore ledge (6) depth is necessary.NOTEIf counterbore depth varies more than 0.001 in. (0.03 mm) atseveral areas measured or counterbore slants downward towardcenter of cylinder liner bore, counterbore ledge will need to berefinished.Steps 12 and 13 check engine block for possible counter-boredistortion.Position telescoping gauge in counterbore (9) and set dial to zero.Move bore gauge around circumference of counterbore (9) and take readings at three intervalsof 120°. The difference in the readings will indicate amount of distortion. If specifications intable 5-4 are exceeded, replace engine block (1).5-38