TM 9-2320-272-24-4
5-7. CYLINDER LINERS AND BLOCK MAINTENANCE (Contd)
WARNING
Drycleaning solvent is flammable and toxic. Do not use near open
flame and always have a fire extinguisher nearby when solvents
are used. Use only in well-ventilated places, wear protective
clothing, and dispose of cleaning rags in approved container.
Failure to do this may result in injury or death to personnel and/or
damage to equipment.
Clean engine block (1). Refer to para. 2-14 for general cleaning instructions.
1.
Run rods (3) with brushes through all oil passages (2) in engine block (1).
2.
WARNING
Eyeshields must be worn when cleaning with compressed air.
Compressed air source will not exceed 30 psi (207 kPa). Failure to
do so may result in injury to personnel.
Blow oil passages (2) of engine block (1) clean with compressed air.
3.
Clean water pump air bleed hole (4) in cylinder bore (5) with compressed air.
4.
Blow all dirt and cleaning solvent from all engine block (1) screw holes (7).
5.
Remove scale from liner counterbore ledge (6).
6.
Clean carbon from lower liner bore (8) of engine block (1).
7.
NOTE
Ensure engine block is on flat surface or workbench for inspection.
Refer to para. 2-15 for general engine block (1) inspection instructions.
8.
Check engine block (1) for worn surfaces, pitting, corrosion, nicks, gouges, burrs, eroded waterholes,
9.
damaged threads, distortion, and cracked areas.
Inspect counterbore ledge (6) of cylinder liner counterbore (9) at points (A) and (B) to ensure
10.
counterbore ledge (6) is 90 to liner bore.
Check counterbore diameter (A) and depth (B) to insure proper seating of cylinder liner and to
11.
determine if machining of counterbore ledge (6) depth is necessary.
NOTE
If counterbore depth varies more than 0.001 in. (0.03 mm) at
several areas measured or counterbore slants downward toward
center of cylinder liner bore, counterbore ledge will need to be
refinished.
Steps 12 and 13 check engine block for possible counter-bore
distortion.
Position telescoping gauge in counterbore (9) and set dial to zero.
12.
Move bore gauge around circumference of counterbore (9) and take readings at three intervals
13.
of 120. The difference in the readings will indicate amount of distortion. If specifications in
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