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4-2. AIR COMPRESSOR-Continued.
d. Repair-Continued.
(d)
Separate the piston (8) from the connecting rod (7).
(e)
Replace defective parts.
(f)
Place piston (8) into position on connecting rod (7) and install piston pin (5) into position using an
arbor press.
(g)
Install two snap rings (4).
(h)
Carefully install a new oil ring (3).
(i)
Carefully install two new compression rings (2).
(j)
Install rod bearings (1).
e. Overhaul. Use the information in chapters 3 and 4 for the disassembly and assembly of the air compressor.
Use the table (Table 4-2) in this chapter to determine if a part is worn past the maximum limits. If the part is worn past
the maximum wear limit, replace the part.
Table 4-2. Maximum Wear Tolerances
ITEM NOMENCLATURE
NORMAL DIMENSION
MAXIMUM ALLOWABLE WEAR
Piston Pin
21.094 mm (0.8311 in) dia.
21.080 mm (0.8306 in) dia.
First Stage Cylinder Bore
99.960 mm (3.9384 in) dia.
99.980 mm (3.9392 in) dia.
Second Stage Cylinder Bore
79.972 mm (3.1509 in) dia.
49.980 mm (3.1512 in) dia.
Crankshaft Connecting Rod Throw
41.090 mm (1.6189 in) dia.
41.075 mm (1.6184 in) dia.
Piston (Top) First Stage
99.850 mm (3.9341 in) dia.
99.800 mm (3.9321 in) dia.
Piston (Top) Second Stage
79.850 mm (3.1461 in) dia.
79.800 mm (3.1441 in) dia.
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