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 TM 55-1905-223-24-3
Table 4-1. Valve Spring Data-inch (mm) lb (N)
Approximate Working Force to Compress
Free Length-in (mm)
Length-in (mm)
Minimum-lb (N)
Maximum-lb (N)
2.685
1.724
147.25
162.75
(68.20)
(43.79)
(655)
(724)
(3) Replace any springs that do not meet the specifications in Table 4-3. (See other spring specifications in Table 4-
6.)
h. Crossheads and pins. Inspection and replacement.
(1) Crossheads (Figure 4-12).
(a) Check the inside diameter of the bore (3). Replace the crosshead if the bore exceeds 0.440 inch (11.18 mm).
(b) Use a bore gauge to check the bore at two points spaced 90 degres apart to find if the bore is out-of-round.
e
Replace as required.
(c) Inspect the rocker lever contact surface (1, Figure 4-11) and the valve stem contact surface (2) for wear.
Check the adjusting screw and threads in the crosshead (4) for wear or damage.
(d) Replace the crosshead if there is damage to the threads in the crosshead.
(2) Straight headless pin (crosshead guide) (4, Figure 4-8).
(a) Be sure that the pin (guide) is straight. Replace any pin (guide) that is not straight.
(b) Use a micrometer to measure the outside diameter of the pin (guide). The diameter must not be worn to less
than 0.432 inch (10.97 mm). Replace as required.
(c) The pin (guide) must be at a right angle to the surface of the cylinder head. Replace the pin (guide) if it is
not.
(d) Use the pin (crosshead guide) spacer to install the pin.
(e) Use a spacer or press to install the pin (crosshead guide). Ensure the height of the pin (guide) is between
1.860 to 1.880 inch (47.24 to 47.75 mm) after it is installed.
(f)
If the bore for the pin (crosshead guide) is damaged:
4-40
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