ARMY TM 9-6115-670-14&P
6-19
6.9. VALVE SPRING.
This task covers: Test
INITIAL SETUP
Tools
Shop Equipment, Electrical Repair,
Semitrailer Mounted
(Item 3, Appendix B)
Outside Micrometer Caliper
(Item 43, Appendix B)
Equipment Conditions
Valve spring removed from valve (para 6.9.).
Materials/Parts
Valve Spring
TEST
a. Test free length and tilt.
(1) Refer to Figure 6-6 and use outside micrometer caliper to measure length of valve spring.
If length is less than 1.118 in. (28.4 mm), replace valve spring.
(2) Place valve spring on a surface plate and place a square (1) on the side of valve spring
(2).
(3) Rotate valve spring to ensure that entire valve spring is flush with the square (1).
(4) If valve spring is not flush with the square, refer to Figure 6-6 and measure the distance
from edge of spring and square (1). If length exceeds 0.047 in. (1.2 mm), replace valve
spring.
(5) Check the entire surface of valve spring for scratches. If any scratches exist, replace
valve spring.
b. Test valve spring setting load.
(1) Place valve spring on setting tester.
(2) Compress valve spring to 1.063 in. (27 mm).
(3) Observe the compression load on the setting tester gauge. If it is less than 12.3 lbs (54.9
N), replace the valve spring.
