ARMY TM 9-2815-254-24
AIR FORCE TO 38G1-94-2
FIGURE 3-71. Valve Spring Free! Height
I .
Check valve spring tension as follows:
(1) Install spring in spring tester, refer to FIGURE 3-72. Compress innerspring to 1.46 in. (37.0 mm) or outer
spring to 1.54 in. (39.0 mm).
(2) Standard pressure to compress inner spring is 12.21 to 13.78 Ibs (5.55 to 6.25 kg), with a limit of 11.03
lbs (5.0 kg). Standard pressure to compress outer spring is 43.33 to 48.84 lbs (19.65 to 22.15 kg). with
a limit of 39.69 lbs (18.0 kg)
(3) If pressure required to compress spring is less than limit, replace spring.
FIGURE 3-72. Valve Spring Tension
3-120
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