TM 9-2320-272-24-2
4-31. AIR COMPRESSOR MAINTENANCE (Contd)
16.
Remove piston (7) and connecting rod (8) from crankcase (9).
NOTE
Tag compression and oil rings for assembly.
17.
Remove compression rings (1) and (2), oil ring expander (4), and two oil rings (3) from piston (7).
Discard compression rings (1) and (2), oil rings (3), and oil ring expander (4).
CAUTION
If piston pin cannot be removed from piston by hand pressure,
place piston in hot water to expand piston pin bore to allow
removal. Driving pin from piston may cause damage to piston.
18.
Remove two retaining rings (5), piston pin (6), and connecting rod (8) from piston (7).
19.
Remove crankcase (9) and mounting plate from vise.
20.
Remove two screws (10) and mounting plate from crankcase (9).
WARNING
Drycleaning solvent is flammable and toxic. Do not used near
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an 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 will result in injury to personnel
and/for damage to equipment.
Eyeshields must be worn when cleaning with compressed air.
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Compressed air source will not exceed 30 psi (207 kPa). Failure
to do so may result in injury to personnel.
1.
Immerse all air compressor parts in drycleaning solvent. Remove all carbon deposits, rust, and
scale. Use compressed air to dry parts.
2.
Ensure that interior drilled oil passages (12) in crankshaft (11) are thoroughly cleaned.
CAUTION
Do not use screwdriver or scraper to remove carbon and scales.
This may cause damage to sealing surfaces.
3.
Clean all gasket remains from mating surfaces using drycleaning solvent.
d. Inspection and Repair
1.
Using depth micrometer, measure exhaust valve (13) seat height. Replace if seat height is less than
0.485 in. (12.32 mm).
2.
Measure intake valve (14) seat height. Replace if seat height is less than 0.270 in. (6.86 mm).
3.
Measure intake valve surface (15). Surface must be flat within 0.001 in. (0.03 mm) total micrometer
reading. If not, replace.
4-220
