TM 5-2420-230-24-2
B3.9 and B5.9 Series Engines
A/C Cylinder Head (SS 191 Model) (012-101)
Section 12 - Compressed Air System - Group 12
Page 12-29
Measure the length of the pin.
Pin Length
mm
in
40.51
MIN
1.595
40.72
MAX
1.603
Replace the pin if not within limits.
Valve Springs
Valve Spring Tester, Part No. 3375182
NOTE: Cummins Engine Company, Inc. recommends that
new springs be installed during rebuild.
Use valve spring tester, Part No. 3375182, to check the
springs.
Replace if not within limits in Table 1, shown below.
Table 1: Spring Data
Load Required to Compress Spring to Length
Spring Length
Minimum
Maximum
mm
in
Kg
lb
Kg
lb
Inlet Valve
5.08
0.20
0.272
0.60
0.340
0.75
Unloader
10.0330
0.395
1.53
3.37
1.90
4.19
Exhaust Valve
5.08
0.20
0.272
0.60
0.340
0.75
Cylinder Head
Inspect and replace if cracks, nicks, gouges, or damaged
threads are found.
L-1233