Page 1979 of 5267

SEAL - CRANKSHAFT OIL - REAR
REMOVAL
1. Disconnect the battery negative cables.
2. Remove the transmission and transfer case (if
equipped).
3. Remove the clutch cover and disc (if manual trans-
mission equipped) (Refer to 6 - CLUTCH/CLUTCH
DISC - REMOVAL).
4. Remove the flywheel or converter drive plate.
5. Remove the flywheel adapter plate.
6. Drill holes 180° apart into the seal. Be careful not
to contact the drill against the crankshaft.
7. Install # 10 sheet metalscrews (1) in the drilled
holes and remove the rear seal with a slide ham-
mer (4).
INSTALLATION
CAUTION: The seal lip and the sealing surface on the crankshaft must be freefrom all oil residue to prevent
seal leaks. The crankshaft and seal surfaces must be completely dry when the seal is installed. Use a soap
and water solution on outside diameter of seal to ease assembly.
1. Clean the crankshaft journal with a suitable solvent and dry with a cleanshop towel or compressed air. Wipe the
inside bore of the crankshaft seal retainer with a clean shop towel.
2. Inspect the crankshaft journal forgouges, nicks, or other imperfections. If the seal groove in the crankshaft is
excessively deep, install the new seal 1/8” deeper into the retainer bore,or obtain a crankshaft wear sleeve that
is available in the aftermarket.
3. Install the seal pilot and new seal, provided in the replacement kit, onto the crankshaft.
4. Remove the seal pilot.
5. Install the installation tool over crankshaft.
6. Using a ball peen hammer, strike the tool (2) at the
12, 3, 6, and 9 o’clock positions until the alignment
tool bottoms out on the retainer.
NOTE: Always install a new clamping ring, never
reuse the old clamping ring.
7. Install the flywheel or converter drive plate, and
clamping ring. Tighten the bolts to 137 Nꞏm (101 ft.
lbs.) torque.
8. Install the clutch cover and disc (if equipped)
(Refer to 6 - CLUTCH/CLUTCH DISC - INSTALLA-
TION).
9. Install the transmission and transfer case (if
equipped).
10. Lower vehicle.
11. Connect battery negative cables.
12. Check engine oil level and adjust, if necessary.
13. Start engine and check for oil leaks.
Page 1980 of 5267

RETAINER - CRANK REAR OIL SEAL
REMOVAL
1. Disconnect the battery negative cables.
2. Raise vehicle on hoist.
3. Remove the oil pan drain plug and drain the engine
oil. Re-install plug and torque to 50 Nꞏm (44 ft. lbs.)
torque.
4. Remove transmission and transfer case (if
equipped) from vehicle.
5. Remove flywheel or torque converter drive plate.
6. Remove flywheel adapter plate.
7. Disconnect starter cables from starter motor.
8. Remove starter motor (Refer to 8 - ELECTRICAL/
STARTING/STARTER MOTOR - REMOVAL) and
transmission adapter plate assembly.
9. Remove four 4 oil pan rear bolts. Slide a feeler
gauge between the seal retainer and oil pan gasket
to break the seal.
10. Remove the six 6 retainer-to-block bolts (3).
11. Remove the rear seal retainer, and gasket (2).
12. Support the seal retainer and drive out the crankshaft seal with a hammer and suitable punch.
INSTALLATION
1. If using the old seal retainer, the crankshaft seal
must be replaced.
2. Inspect oil pan gasket for nicks or cuts. If gasket is
damaged, the oil pan must be removed and gasket
must be replaced. Wipe oil pan gasket dry and
apply light coating of RTV.
3. Using the retainer alignment/seal installation tool
provided in the seal service kit, install the align-
ment tool into the retainer and install to the cylinder
block, using a new gasket. Tighten the six (6)
mounting bolts by hand.
4. The seal alignment tool is used to align rear cover
properly. Starting with the center two bolts, tighten
the retainer in a circular pattern to 10 Nꞏm (89 in.
lbs.). Remove the alignment tool.
Page 1981 of 5267

CAUTION: The seal lip and the sealing surface on
the crankshaft must be free from all oil residue to
prevent seal leaks. The crankshaft and seal sur-
faces must be completely dry when the seal is
installed. Use a soap and water solution on out-
side diameter of seal to ease assembly.
5. Make sure the provided seal pilot (1) is installed
into the new crankshaft seal (3). Use the align-
ment/installation tool and press the seal onto the
crankshaft. Alternately drive the seal at the 12, 3, 6
and 9 o’clock positions.
6. Remove the alignment tool and trim the retainer
gasket (1) even with the oil pan mounting surface.
7. Remove the seal pilot.
8. Apply a small amount of Mopar
Silicone Rubber
Adhesive Sealant to the oil pan rail T-joints.
9. Install the four (4) oil pan rear mounting bolts and
torque to 28 Nꞏm (21 ft. lbs.).
10. Install new rectangular ring seal for cam bore.
11. Install the flywheel housing and bolts. Torque
boltsto77Nꞏm(57ft.lbs.).
12. Install the flywheel housing and bolts. Torque
boltsto77Nꞏm(57ft.lbs.).
NOTE: A new clamping ring must be used on early
or late builds, automatic or manual. Do not reuse
clamping ring.
13. Install the dual mass flywheel with crankshaft adapter. Tighten boltsto 137 Nꞏm (101 ft. lbs.).
14. Install the starter motor Refer to (Refer to 8 - ELECTRICAL/STARTING/STA R T E R M O TO R - I N S TA L L AT I O N ) .
15. Install the transmission and transfer case (if equipped).
16. Lower vehicle.
17. Fill the crankcase with new engine oil.
18. Connect the battery negative cables.
19. Start engine and check for oil leaks.
Page 1982 of 5267
TAPPETS - VALVE
REMOVAL
NOTE: This procedure requires use of Miller Tool
8502 Tappet Replacement Kit.
1. Remove camshaft (Refer to 9 - ENGINE/ENGINE
BLOCK/CAMSHAFT & BEARINGS (IN BLOCK) -
REMOVAL).
2. Insert the trough (1) (provided with tool kit) the full
length of the camshaft bore. Make sure the cap
end goes in first and the open side faces up
(towards tappets).
3.Remove only one tappet at a time.Remove rub-
ber band from one cylinder pair and attach tappet
dowel not being removed to the next cylinder pair.
4. Raise dowel rod (disengage from tappet) and allow
tappet to fall into trough.
5. Carefully remove trough(do not rotate)and tap-
pet. If the tappet is not being replaced, mark it so it
can be installed in its original location.
Page 1984 of 5267
2. Lower the tappet installation tool through the push
rod hole and into the trough.
3. Retrieve the tappet installation tool using the
hooked rod provided with the tool kit
.
4. Lubricate the tappet with clean engine oil or suit-
able equivalent and install the tappet to the instal-
lation tool.
5. Pull the tappet up and into position. If difficulty is
experienced getting the tappet to make the turn
into the tappet bore, wiggle the trough whilegently
pulling up on the tappet.
Page 1985 of 5267
6. With the tappet in place, rotate the trough one half
turn so the open side is down (toward crankshaft).
7. Remove the tappet installation tool from the tappet.
8. Re-install a dowel rod and secure the rod with a
rubber band.
9. Rotate the trough one half turn and repeat the pro-
cedure for the remaining tappets.
10. Install the camshaft (Refer to 9 - ENGINE/EN-
GINE BLOCK/CAMSHAFT & BEARINGS (IN
BLOCK) - INSTALLATION).
Page 1986 of 5267

PISTON & CONNECTING ROD
DESCRIPTION
PISTONS
The piston is constructed of aluminum and is gravity
cast, free floating design. The piston incorporates a
centrally located high swirl combustion bowl, and uti-
lizes a “keystone” style top compression ring, and a
“Tapered Face” intermediate ring, for superior cylinder
wall scraping. Piston cooling nozzles cool the piston
and pin with engine oil supplied by the crankshaft
main journals. All pistons are gallery cooled and utilize
J-jet piston cooling nozzles. Pistons are directional in
order to provide clearance to piston cooling nozzles.
CONNECTING RODS
The connecting rods are a split angle design. They
have a pressed-in-place wrist pin bushing that is lubri-
cated by piston cooling nozzle oil spray.
Machined connecting rods are no longer used in
the diesel engine. Do not install machined con-
necting rods into an engine that has fractured split
connecting rods.
Fractured split connecting rods are first manufactured
asasinglepieceandthenfracturedintotwopieces.Fracturedsplitconnecting rods can be identified by a rough
and irregular surface at the connecting rod split face. To properly assemble the rod cap to the connecting rod, the
bearing tangs on the connecting rod and cap must be located on the same side of the rod. The long end of the
connecting rod must be assembled on theintake or camshaft side of the engine.
Each matched fractured split connecting rod and cap is an assembly and are not interchangeable. If a connecting
rod or cap is damaged, the entire assembly must be replaced.
STANDARD PROCEDURE - HEAD GASKET SELECTION
1. Measure piston protrusion for all six pistons.
2. Calculate the average piston protrusion. Maximum allowable protrusion is 0.516 mm (0.020 inch).
NOTE: There are two different head gaskets available. One gasket is for Average piston protrusion less than
0.30 mm (0.011 inch). The other gasket is for Average piston protrusion greater than 0.30 mm (0.011 inch)
Page 1987 of 5267

REMOVAL
1. Disconnect the battery cables.
2. Remove the cylinder head (Refer to 9 - ENGINE/CYLINDER HEAD - REMOVAL).
3. Remove the oil pan and suction tube (Refer to 9 - ENGINE/LUBRICATION/OILPA N - R E M O VA L ) .
4. Remove bolts and the block stiffener.
5. Using Miller Tool 7471-B crankshaft barring tool, rotate the crankshaft so all of the pistons are below TDC.
6. Before removing the piston(s) from the bore(s):
a. Remove any carbon ridge formations or deposits at the top of the bore witha dull scraper or soft wire brush.
b. If cylinder bore wear ridges are found, use a ridge reamer to cut the ridgefrom the bore. DO NOT remove
more metal than necessaryto remove the ridge.
7. Remove the J-jet cooling nozzles.
NOTE: If cylinders have ridges, the cylinders are oversize and will more than likely need boring.
8. Using a hammer and steel stamp, stamp the cylinder number in the top of eachpiston.Thefrontofthepiston
is identified by a stamping on the top of the piston. DO NOT stamp in the outside 5 mm (.197 in.) of the piston
diameter. DO NOT stamp over the piston pin.
9. Mark the connecting rod and cap with the corresponding cylinder numbers.
10. Remove the connecting rod bolts and rod caps. Use care so the cylinder bores and connecting rods are not
damaged.
11. Use a hammer handle or similar object to push the piston and connecting rod through the cylinder bore.
12. Store the piston/rod assemblies in a rack.
CLEANING—PISTON AND CONNECTING ROD
CAUTION: DO NOT use bead blast to clean the pistons. DO NOT clean the pistonsandrodsinanacidtank.
PISTON
Clean the pistons and pins in a suitable solvent, rinse in hot water and blowdry with compressed air. Soaking the
pistons over night will loosen most of the carbon build up. De-carbon the ringgrooveswithabrokenpistonringand
again clean the pistons in solvent. Rinse in hot water and blow dry with compressed air.
CONNECTING ROD
Clean the connecting rods in a suitable solvent, rinse in hot water and blowdry with compressed air.
INSPECTION
INSPECTION - PISTONS
PISTON SKIRT DIAMETER (MIN.)
101.775 mm (4.006 in. )
Inspect the pistons for damage and excessive wear. Check top of the piston,ring grooves, skirt and pin bore. Mea-
sure the piston skirt diameter. If the piston is out of limits, replace the piston.