Dodge Dakota Sport 2001 Service Manual page 1072

AN
HYDRAULIC LIFTERS (CAM IN BLOCK) (Continued)
20-110 seconds to leak-down. Discard tappets with
leak-down time interval not within this specification.
Fig. 48 Leak-Down Tester
1 - POINTER
2 - WEIGHTED ARM
3 - RAM
4 - CUP
5 - HANDLE
6 - PUSH ROD
REMOVAL
Retain all the components in the same order as
removed.
(1) Remove the engine cylinder head cover (Refer
to 9 - ENGINE/CYLINDER
HEAD COVER(S) - REMOVAL).
(2) Remove the bridge and pivot assemblies and
rocker arms by removing the capscrews at each
bridge. Alternately loosen each capscrew, one turn at
a time, to avoid damaging the bridges.
(3) Remove the push rods.
(4) Remove the tappets through the push rod open-
ings in the cylinder head with a Hydraulic Valve
Tappet Removal/Installation Tool (Fig. 49).
CLEANING
Clean each tappet assembly in cleaning solvent to
remove all varnish, gum and sludge deposits.
INSPECTION
Inspect for indications of scuffing on the side and
base of each tappet body.
Inspect each tappet base for concave wear with a
straightedge positioned across the base. If the base is
concave, the corresponding lobe on the camshaft is
also worn. Replace the camshaft and defective tap-
pets.
HEAD/CYLINDER
Fig. 49 Hydraulic Valve Tappet Removal/Installation
1 - HYDRAULIC VALVE TAPPET REMOVAL/INSTALLATION TOOL
INSTALLATION
It is not necessary to charge the tappets with
engine oil. They will charge themselves within a very
short period of engine operation.
(1) Dip each tappet in Mopar Engine Oil Supple-
ment, or equivalent.
(2) Use Hydraulic Valve Tappet Removal/Installa-
tion Tool to install each tappet in the same bore from
where it was originally removed.
(3) Install the push rods in their original locations.
(4) Install the rocker arms and bridge and pivot
assemblies at their original locations. Loosely install
the capscrews at each bridge.
(5) Tighten the capscrews alternately, one turn at
a time, to avoid damaging the bridges. Tighten the
capscrews to 28 N·m (21 ft. lbs.) torque.
(6) Install the engine cylinder head cover (Refer to
9 - ENGINE/CYLINDER HEAD/CYLINDER HEAD
COVER(S) - INSTALLATION).
PISTON & CONNECTING ROD
DESCRIPTION
The pistons are made of aluminum and have three
ring grooves, the top two grooves are for the compres-
sion rings and the bottom groove is for the oil control
ring. The connecting rods are forged steel and are
coined prior to heat treat. The piston pins are press
fit.
ENGINE 2.5L
Tool
9 - 43