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TM 9-2320-364-34-4
20-178
20-60. PISTON AND CONNECTING ROD REPAIR (CONT).
b.
Cleaning/Inspection.
Drycleaning Solvent (P-D-680) is TOXIC and flammable. Wear protective goggles, face
shield, and gloves; use only in a well-ventilated area; avoid contact with skin, eyes, and
clothes, and do not breathe vapors. Keep away from heat or flame. Never smoke when
using solvent. The flashpoint for Type II Drycleaning Solvent is 140 degrees F (60 degrees
C) and Type III Drycleaning Solvent is 200 degrees F (93 degrees C). Failure to do so may
result in injury or death to personnel.
If personnel become dizzy while using cleaning solvent, immediately get fresh air and
medical help. If solvent contacts skin or clothes, flush with cold water. If solvent contacts
eyes, immediately flush eyes with water and get immediate medical attention.
Do not sandblast or use wire brush to clean carbon deposits from piston skirt. Damage to
parts may occur.
(1)
Clean carbon deposits from all ring grooves using soft bristle brush and drycleaning solvent.
(2)
Clean oil drain holes in piston skirt using brush and drycleaning solvent.
(3)
Clean all metal parts, except connecting rod and piston pin with drycleaning solvent.
Fuel is very flammable and can explode easily. To avoid serious injury or death, keep fuel
away from open fire and keep fire extinguisher within easy reach when working with fuel.
Do not work on fuel system when engine is hot. Fuel can be ignited by hot engine.
(4)
Clean connecting rod and piston pin with diesel fuel.
Compressed air used for cleaning purposes will not exceed 30 psi (207 kPa). Use only with
effective chip guarding and personal protective equipment (goggles/shield, gloves, etc).
Failure to comply may result in injury or death to personnel.
(5)
Dry all parts with compressed air.
(6)
Inspect all parts for nicks, burrs or scratches. Replace all damaged parts.
(7)
Inspect piston skirt and piston crown for score marks, cracks, or damaged ring grooves.
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