Dodge Dakota (R1). Manual — part 476
CONNECTING ROD BEARINGS
STANDARD PROCEDURE—CONNECTING ROD
BEARING FITTING
Fit all rods on a bank until completed. DO NOT
alternate from one bank to another, because connect-
ing rods and pistons are not interchangeable from
one bank to another.
The bearing caps are not interchangeable and
should be marked at removal to ensure correct
assembly.
Each bearing cap has a small V-groove across the
parting face. When installing the lower bearing shell,
be certain that the V-groove in the shell is in line
with the V-groove in the cap. This provides lubrica-
tion of the cylinder wall in the opposite bank.
The bearing shells must be installed so that the
tangs are in the machined grooves in the rods and
caps.
Limits of taper or out-of-round on any crankshaft
journals should be held to 0.025 mm (0.001 in.).
Bearings are available in 0.025 mm (0.001 in.), 0.051
mm (0.002 in.), 0.076 mm (0.003 in.), 0.254 mm
(0.010 in.) and 0.305 mm (0.012 in.) undersize.
Install the bearings in pairs. DO NOT use a new
bearing half with an old bearing half. DO NOT
file the rods or bearing caps.
CRANKSHAFT
DESCRIPTION
The crankshaft (Fig. 26) is of a forged steel splayed
type design, with four main bearing journals.The
crankshaft is located at the bottom of the engine
block and is held in place with four main bearing
caps.
OPERATION
The crankshaft transfers force generated by com-
bustion within the cylinder bores to the flywheel or
flexplate.
REMOVAL
(1) Remove the oil pan (Refer to 9 - ENGINE/LU-
BRICATION/OIL PAN - REMOVAL).
(2) Remove the oil pump (Refer to 9 - ENGINE/
LUBRICATION/OIL PUMP - REMOVAL).
(3) Identify bearing caps before removal. Remove
bearing caps and bearings one at a time.
(4) Lift the crankshaft out of the block.
(5) Remove and discard the crankshaft rear oil
seals.
(6) Remove and discard the front crankshaft oil
seal.
INSTALLATION
(1) Lightly oil the new upper seal lips with engine
oil.
(2) Install the new upper rear bearing oil seal with
the white paint facing towards the rear of the engine.
(3) Position the crankshaft into the cylinder block.
(4) Lightly oil the new lower seal lips with engine
oil.
(5) Install the new lower rear bearing oil seal into
the bearing cap with the white paint facing towards
the rear of the engine.
(6) Apply 5 mm (0.20 in.) drop of Loctite 518, or
equivalent, on each side of the rear main bearing cap
(Fig. 27). DO NOT over-apply sealant or allow the
sealant to contact the rubber seal. Assemble bearing
cap to cylinder block immediately after sealant appli-
cation.
(7) To align the bearing cap, use cap slot, align-
ment dowel, and cap bolts. DO NOT remove excess
material after assembly. DO NOT strike rear cap
more than two times for proper engagement.
(8) Clean and oil all cap bolts. Install all main
bearing caps. Install all cap bolts and alternately
tighten to 115 N·m (85 ft. lbs.) torque.
(9) Install oil pump (Refer to 9 - ENGINE/LUBRI-
CATION/OIL PUMP - INSTALLATION).
(10) Apply Mopar
t Silicone Rubber Adhesive Seal-
ant, or equivalent, at bearing cap-to-block joint to
provide cap-to-block and oil pan sealing (Fig. 28).
Apply enough sealant so that a small amount is
squeezed out. Withdraw nozzle and wipe excess seal-
ant off the oil pan seal groove.
(11) Install new front crankshaft oil seal (Refer to
9 - ENGINE/ENGINE BLOCK/CRANKSHAFT OIL
SEAL - FRONT - INSTALLATION).
(12) Immediately install the oil pan (Refer to 9 -
ENGINE/LUBRICATION/OIL
PAN
-
INSTALLA-
TION).
Fig. 26 Crankshaft—3.9L Engine
9 - 92
ENGINE 3.9L
AN
(13) Install new rear oil seal (Refer to 9 -
ENGINE/ENGINE
BLOCK/CRANKSHAFT
OIL
SEAL - REAR - INSTALLATION).
CRANKSHAFT MAIN
BEARINGS
DESCRIPTION
Main bearings (Fig. 29) are located in the cylinder
block. One half of the main bearing is located in the
crankshaft main bore the other half of the matching
bearing is located in the main bearing cap. there are
four main bearings. Number two main bearing is
flanged, this flange controls crankshaft thrust.
OPERATION
The main bearings encircle the crankshaft main
bearing journals, this aligns the crankshaft to the
centerline of the engine and allows the crankshaft to
turn without wobbling or shaking therefore eliminat-
ing vibration. The main bearings are available in
standard and undersizes.
STANDARD PROCEDURE—CRANKSHAFT MAIN
BEARING FITTING
Bearing caps are NOT interchangeable and should
be marked at removal to ensure correct assembly.
Upper and lower bearing halves are NOT inter-
changeable. Lower main bearing halves of No. 1 and
3 are interchangeable.
Upper and lower No. 2 bearing halves are flanged
to carry the crankshaft thrust loads. They are NOT
interchangeable with any other bearing halves in the
engine (Fig. 30). Bearing shells are available in stan-
dard and the following undersizes: 0.25 mm (0.001
in.), 0.051 mm (0.002 in.), 0.076 mm (0.003 in.), 0.254
mm (0.010 in.) and 0.305 mm (0.012 in.). Never
install an undersize bearing that will reduce clear-
ance below specifications.
Fig. 27 Sealant Application to Bearing Cap
1 - MOPAR SILICONE RUBBER ADHESIVE SEALANT SLOTS
2 - LOCTITE 515 (OR EQUIVALENT)
3 - CAP ALIGNMENT SLOT
4 - REAR MAIN BEARING CAP
Fig. 28 Apply Sealant to Bearing Cap-to-Block Joint
1 - MOPAR
T
GEN II SILICONE RUBBER ADHESIVE SEALANT
NOZZLE TIP
2 - SEALANT APPLIED
3 - CYLINDER BLOCK
4 - REAR MAIN BEARING CAP
Fig. 29 Main Bearing Orientation
Fig. 30 Main Bearing Identification
AN
ENGINE 3.9L
9 - 93
CRANKSHAFT (Continued)
CRANKSHAFT IDENTIFICATION LOCATION
CHART
ITEM
MEASUREMENT
IDENTIFICATION
ROD U/S
0.025 mm
R1-R2-R3 ect.
(0.001 in.)
indicates rod
journal
No. 1, 2 and 3.
MAIN U/S
0.025 mm
M1-M2-M3 or M4
(0.001 in.)
indicates main
journal
No. 1, 2, 3, and 4.
REMOVAL
(1) Remove the oil pan (Refer to 9 - ENGINE/LU-
BRICATION/OIL PAN - REMOVAL).
(2) Remove the oil pump (Refer to 9 - ENGINE/
LUBRICATION/OIL PUMP - REMOVAL).
(3) Identify bearing caps before removal. Remove
bearing caps one at a time.
(4) Remove upper half of bearing by inserting
Crankshaft Main Bearing Remover/Installer Tool
C-3059 into the oil hole of crankshaft (Fig. 31).
(5) Slowly rotate crankshaft clockwise, forcing out
upper half of bearing shell.
INSTALLATION
Only one main bearing should be selectively fitted
while all other main bearing caps are properly tight-
ened. All bearing capbolts removed during service
procedures are to be cleaned and oiled before instal-
lation. DO NOT use a new bearing half with an old
bearing half.
When installing a new upper bearing shell, slightly
chamfer the sharp edges from the plain side.
(1) Start bearing in place, and insert Crankshaft
Main Bearing Remover/Installer Tool C-3059 into oil
hole of crankshaft (Fig. 31).
(2) Slowly rotate crankshaft counterclockwise slid-
ing the bearing into position. Remove Tool C-3059.
(3) Install the bearing caps. Clean and oil the
bolts. Tighten the capbolts to 115 N·m (85 ft. lbs.)
torque.
(4) Install the oil pump (Refer to 9 - ENGINE/LU-
BRICATION/OIL PUMP - INSTALLATION).
(5) Install the oil pan (Refer to 9 - ENGINE/LU-
BRICATION/OIL PAN - INSTALLATION).
CRANKSHAFT OIL SEAL -
FRONT
DESCRIPTION
The crankshaft front seal is a one piece viton seal
with a steel housing. The front seal is located in the
engine front cover.
OPERATION
The crankshaft seals prevent oil from leaking from
around the crankshaft, either from the rear of the
engine or from the engine front cover.
REMOVAL
The oil seal can be replaced without removing the
timing chain cover, provided that the cover is not
misaligned.
(1) Disconnect the negative cable from the battery.
(2) Remove
vibration
damper
(Refer
to
9
-
ENGINE/ENGINE BLOCK/VIBRATION DAMPER -
REMOVAL).
(3) If front seal is suspected of leaking, check front
oil seal alignment to crankshaft. The seal installa-
tion/alignment Tool 6635, should fit with minimum
interference. If tool does not fit, the cover must be
removed and installed properly.
(4) Place a suitable tool behind the lips of the oil
seal to pry the oil seal outward. Be careful not to
damage the crankshaft seal bore of cover.
INSTALLATION
(1) Place the smaller diameter of the oil seal over
Front Oil Seal Installation Tool 6635 (Fig. 32) . Seat
the oil seal in the groove of the tool.
(2) Position the seal and tool onto the crankshaft
(Fig. 33).
Fig. 31 Upper Main Bearing Removal and
Installation with Tool C-3059
1 - SPECIAL TOOL C-3059
2 - BEARING
3 - SPECIAL TOOL C-3059
4 - BEARING
9 - 94
ENGINE 3.9L
AN
CRANKSHAFT MAIN BEARINGS (Continued)
(3) Using the vibration damper bolt, tighten the
bolt to draw the seal into position on the crankshaft
(Fig. 34).
(4) Remove the vibration damper bolt and seal
installation tool.
(5) Inspect
the
seal
flange
on
the
vibration
damper.
(6) Install the vibration damper (Refer to 9 -
ENGINE/ENGINE BLOCK/VIBRATION DAMPER -
INSTALLATION).
(7) Connect the negative cable to the battery.
CRANKSHAFT OIL SEAL -
REAR
DESCRIPTION
The crankshaft rear seal is a two piece viton seal.
One part of the two piece rear seal is located in a slot
in the number four (4) crankshaft main bore, the sec-
ond part of the two piece seal is located in the num-
ber four (4) main bearing cap.
OPERATION
The crankshaft seals prevent oil from leaking from
around the crankshaft, either from the rear of the
engine or from the engine front cover.
DIAGNOSIS AND TESTING—REAR SEAL AREA
LEAKS
Since it is sometimes difficult to determine the
source of an oil leak in the rear seal area of the
engine, a more involved inspection is necessary. The
following steps should be followed to help pinpoint
the source of the leak.
If the leakage occurs at the crankshaft rear oil seal
area:
(1) Disconnect the battery.
(2) Raise the vehicle.
(3) Remove torque converter or clutch housing
cover and inspect rear of block for evidence of oil.
Use a black light to check for the oil leak:
Fig. 32 Placing Oil Seal on Installation Tool 6635
1 - CRANKSHAFT FRONT OIL SEAL
2 - INSTALL THIS END INTO SPECIAL TOOL 6635
Fig. 33 Position Tool and Seal onto Crankshaft
1 - SPECIAL TOOL 6635
2 - OIL SEAL
3 - TIMING CHAIN COVER
Fig. 34 Installing Oil Seal
1 - SPECIAL TOOL 6635
2 - TIMING CHAIN COVER
AN
ENGINE 3.9L
9 - 95
CRANKSHAFT OIL SEAL - FRONT (Continued)
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