4TNV98 & 4TNE98 Diesel Engine Section 3. Engine90Figure 6-43. Remove the valve cover (Figure 6-4, (3)). Discardthe valve cover gasket (Figure 6-4, (4)).Removal of Rocker Arm Assembly1. Remove the bolt (Figure 6-6, (1)) and lockingnuts (Figure 6-6, (2)) that retain the rocker armsupport brackets to the cylinder head.2. Lift the rocker arm assembly from the cylinderhead.3. Lift the push rods from the cylinder head.4. Number the push rods so that they are reinstalledwith the same valve tappet and rocker arm.Figure 6-6Disassembly of Rocker Arm Assembly1. Remove the rocker arm shaft alignment screw(Figure 6-7, (1)) from the support bracket thatsecures the rocker arm shaft (Figure 6-7, (2)).2. Remove the retaining rings (Figure 6-7, (3)) fromthe ends of the rocker arm shaft (Figure 6-7, (2)).3. Slide the rocker arm shaft (Figure 6-7, (2)) out ofthe rocker arm support brackets (Figure 6-7, (4)),springs (Figure 6-7, (5)), and rocker arms (Figure-7, (6)).NOTE : The rocker arm shaft fits tightly in the rockerarm support brackets. Clamp the support bracket ina padded vise and twist the rocker arm shaft toremove. Reverse this process when you reinstall therocker arm shaft into the support brackets.NOTE : Mark the rocker arms so they can bereinstalled with the original matching valve andpushrod.
