ARMY TM 9-6115-604-12NAVY NAVFAC P-8-633-12(4) Grasp rocker levers (1, 2, and 3, Figure 4-51) on each end and rock levers from side to side to detect bushing or rocker lever shaft (4) wear.(5)Rock valve crosshead (1, Figure 4-52) on crosshead guide (2) to detect wear between crosshead and guide.(6)Using a wire gage, measure clearance A. Clearance A should be a minimum of 0 025 inch (O 64 mm).(7)If wear or damage is detected, or if clearance A is under 0.025 Inch (0.64 mm), refer to the next higher level of maintenance.(8)Replace rocker housing covers in accordance with paragraph 3-14.b. Adjust.(1)General. Rocker lever crosshead adjustment must be performed in accordance with engine firing order (Figure4-53). VS (valve set) marks are provided to ensure that adjustments will be made only to the proper cylinders.Access to VS marks is provided on the vibration damper (Figure 4-54) on the right and left side of the flywheelhousing (Figure 4-55). Each VS mark is encoded with the number and location of two cylinders to whichadjustments may be possible. Note that adjustments may be made to only one of the two indicated cylinders. Itwill be necessary to rotate the flywheel through two complete revolutions In order to make adjustments to all thecylinders. Rocker adjustment should be done at a stabilized temperature of 140°F (60C), or below. The Injectorplungers and valve crossheads must be adjusted before adjusting the valve rocker levers. Therefore, thesequence of adjustments must be in the order presented In the steps that follow.Figure 4-53. Cylinder Arrangement andFigure 4-54. Vibration Damper TimingFiring OrderMarks4-147
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