Figure 3-32. Valve head and collet check.

TM 9-2815-213-34

NOTE

A 1/32 inch spacer may be used under

valve spring when insert and valve have

been refaced.

(2) Replace springs if load is less than indicated

under "wear limits" at required compressed length.

Figure 3-32. Valve head and collet check.

Figure 3-34. Valve guide check

Figure 3-33. Crosshead guide cheek.

(5) Check valve guide protrusion to limit of

0.695/0.710 inch.

h. Valve Springs (fig. 3-35).

NOTE

Weak valve springs may cause flutter

Figure 3-35. Valve spring test.

which results in excessive wear on both

valve and seat. Valve flutter interferes

3-67. Repair

with valve timing and may cause valve to

a. Resurface Cylinder Head. Resurface head only

strike the piston head. Weak springs

if it has been scratched, etched, or worn unevenly at

may also cause valve warping, cracking

point of contact with gasket sealing areas.

and breaking.

(1) Remove a maximum of 0.006 inch of

material.

(1) Using a spring tester capable of very

NOTE

accurate measurements of spring lengths and applied

The gasket surface should not deviate

load, check springs against limits speciflied in repair and

from a true plane b, mote than 0.004-

rebuild standards, paragraph 3-183.

inch.

3-18