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 TM 5-2420-224-34
AIR COMPRESSOR REPLACEMENT AND REPAIR (CONT)
Camshaft Journal
Measure diameter of camshaft journal to
1.
determine bearing set to be installed. (Refer
to table.) If journal measurement is between
Bearing
Camshaft
repair stages, use repair stage closest to
Set
Journal
Repair
measurement.
Stage
In.
In.
Example:
(mm)
(mm)
repair stage I
= 1.256 in. (31.902 mm)
repair stage II
= 1.250 in. (31.750 mm)
1.260
1.259-1.260
Standard
journal
(32.000)
(31.984-32.000)
= 1.254 in. (31.851 mm)
measurement
1.256
1.255-1.256
Standard I
Use repair stage I
(31.900)
(31.884-31.900)
If journal measurement is less than 1.230 in.
1.250
1.249-1.250
Stage I
(31 .234 mm), replace camshaft.
(31.734-31 .750)
(31.750)
Inspect cylinder liner for scratches, gouges,
2.
1.239-1.240
1.240
Stage II
pitting, and nicks. Replace cylinder liner if any
(31.484-31 .500)
(31.500)
of these defects are present.
1.230
1.229-1.230
Stage Ill
Measure cylinder liner bore twice (in line with
3.
(31.250)
(31.234-31 .250)
c a m s h a f t journal, and at 90 degrees to
camshaft journal) at three different places
along liner. If cylinder bore deviation is more
than 0.0012 in. (0.030 mm), replace cylinder
liner.
Measure inside diameter of bushing. If
4.
diameter is more than 0.6312-0.6318 in.
(16.022-1 6.038 mm), replace bushing.
Inspect piston for damage. Replace If
5.
damaged.
Check end gap of each ring by inserting
6.
squarely into cylinder and measuring with
feeler gage. Gap should be 0.016-0.026 in.
(0.406-0.660 mm).
7.
Check piston ring side clearance with new
rings installed. Ring side clearance should be
0.0004-0.0018 in. (0.010-0.045 mm). If side
clearance is not within this measurement,
replace piston.
3-36
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