LIFTER(S), Hydraulic, Roller: Installation: Installation

WARNING: This page is about a different variant/trim than selected.

Fig 1: MDS Lifter

Courtesy of CHRYSLER LLC

The Multiple Displacement System (MDS) provides cylinder deactivation during steady speed, low acceleration and shallow grade climbing conditions to increase fuel economy.

CAUTION:

Engines equipped with MDS use both standard roller lifters (2) and deactivating roller lifters (1). 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 (3), for the latching pins.

CAUTION:

The lifter and retainer assembly must be installed as a unit.

Fig 2: Tappet Guide Holder Assembly

Courtesy of CHRYSLER LLC

Lubricate the tappet guide holder (1) and tappets (2).

Fig 3: Rear MDS Lifter Assembly
Courtesy of CHRYSLER LLC

CAUTION:
If the lifters and guide holder assembly are to be reused, they must me installed in their original location.
Install the tappet guide holder (2) and tappets.
Tighten the tappet retainer bolt (1) to 12 N.m (9 ft. lbs.).
Install the cylinder head. Refer to Cylinder Head, Installation, 5.7L .
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.
Start the engine and check for leaks.
Road test the vehicle.