1. Lubricate the lifters (2) and retainer (1) assembly with clean engine oil.
CAUTION: The 6.4L Multi Displacement System (MDS) engine uses both standard roller lifters and deactivating roller lifters. The deactivating roller lifters must be used in cylinders 1, 4, 6, 7. The deactivating lifters can be identified by the two holes in the side of the lifter body, for the latching pins.
CAUTION: If the lifter and retainer assembly are to be reused, identify the lifters to ensure installation in their original location or engine damage could result.
CAUTION: The lifter and retainer must be installed as an assembly.
2. Install the lifters (2) and retainer (1) as an assembly into their original location.
3. Tighten the lifter retainer bolt (1) to 12 N.m (9 ft. lbs.).
4. Install the cylinder head. Refer to CYLINDER HEAD, INSTALLATION.
5. Connect the negative battery cable.
CAUTION: To prevent damage to valve assemblies, do not run the engine above fast idle until all hydraulic lifters have filled with oil and have become quiet.
6. Start the engine and check for leaks.
7. Road test the vehicle.
