Chrysler Pacifica. Manual — part 703
on the adjacent bearings and tightening bolts to
14–20 N·m (10–15 ft. lbs.).
• When checking #1 main bearing shim #2 main
bearing.
• When checking #2 main bearing shim #1 & #3
main bearing.
• When checking #3 main bearing shim #2 & #4
main bearing.
• When checking #4 main bearing shim #3 main
bearing.
NOTE:
Remove
all
shims
before
reassembling
engine.
(2) Alternative Method:
a. Support the weight of the crankshaft with a
jack under the counterweight adjacent to the bearing
being checked.
(3) Remove oil film from surface to be checked.
Plastigage is soluble in oil.
NOTE: The 3.8L engine may be equipped with any
number or combination of standard forged rod cap
or cracked cap connecting rods. The connecting
rods are interchangeable but require a different
tightening specification (Refer to 9 - ENGINE -
SPECIFICATIONS).
(4) Place a piece of Plastigage across the entire
width of the bearing shell in the cap approximately
6.35 mm (1/4 in.) off center and away from the oil
holes (Fig. 93). (In addition, suspected areas can be
checked by placing the Plastigage in the suspected
area). Torque the bearing cap bolts of the bearing
being checked to the proper specifications.
(5) Remove the bearing cap and compare the width
of the flattened Plastigage (Fig. 94) with the scale
provided on the package. Locate the band closest to
the same width. This band shows the amount of
clearance in thousandths. Differences in readings
between the ends indicate the amount of taper
present. Record all readings taken. (Refer to 9 -
ENGINE - SPECIFICATIONS) Plastigage gener-
ally is accompanied by two scales. One scale is
in inches, the other is a metric scale.
NOTE: Plastigage is available in a variety of clear-
ance ranges. Use the most appropriate range for
the specifications you are checking.
PLASTIGAGE METHOD—ENGINE OUT-OF-VEHICLE
(1) With engine in the inverted position (crank-
shaft up) and mounted on a repair stand, remove
main journal cap.
(2) Remove oil from journal and bearing shell.
(3) Cut Plastigage to same length as width of the
bearing and place it in parallel with the journal axis
(Fig. 93).
(4) Carefully install the main bearing cap and
tighten the bolts to specified torque (Refer to 9 -
ENGINE - SPECIFICATIONS).
CAUTION: Do not rotate crankshaft or the Plasti-
gage will be smeared.
(5) Carefully remove the bearing cap and measure
the width of the Plastigage at the widest part using
the scale on the Plastigage package (Fig. 94). Refer
to Engine Specifications for proper clearances (Refer
to 9 - ENGINE - SPECIFICATIONS). If the clearance
exceeds the specified limits, replace the main bear-
ing(s) with the appropriate size, and if necessary,
have the crankshaft machined to next undersize.
Fig. 93 Plastigage Placed in Lower Shell
1 - PLASTIGAGE
Fig. 94 Clearance Measurement
CS
ENGINE 3.8L
9 - 167
CRANKSHAFT MAIN BEARINGS (Continued)
REMOVAL - CRANKSHAFT MAIN BEARINGS
(1) Remove the oil pan. (Refer to 9 - ENGINE/LU-
BRICATION/OIL PAN - REMOVAL)
(2) Identify main bearing caps before removal.
(3) Remove bearing caps one at a time. Remove
upper half of bearing by inserting Special Main Bear-
ing Tool C-3059 (Fig. 95) into the oil hole of crank-
shaft.
(4) Slowly rotate crankshaft clockwise, forcing out
upper half of bearing shell.
INSTALLATION - CRANKSHAFT MAIN
BEARINGS
NOTE: One main bearing should be selectively fit-
ted while all other main bearing caps are properly
tightened.
(1) For main bearing fitting procedure, (Refer to 9
- ENGINE/ENGINE BLOCK/CRANKSHAFT MAIN
BEARINGS - STANDARD PROCEDURE)
(2) Start bearing in place, and insert Main Bearing
Tool C-3059 into oil hole of crankshaft (Fig. 95).
(3) Slowly rotate crankshaft counterclockwise slid-
ing the bearing into position. Remove Special Main
Bearing Tool C-3059.
(4) Inspect main cap bolts for stretching (Fig. 96).
Replace bolts that are stretched.
NOTE: The main cap bolts should be examined
before reuse. Bolt stretch can be checked by hold-
ing a scale or straight edge against the threads. If
all the threads do not contact the scale the bolt
must be replaced (Fig. 96).
(5) Install each main cap and tighten bolts finger
tight.
(6) Tighten number 1, 3 and 4 main cap bolts to 41
N·m + 1/4 Turn (30 ft. lbs.+ 1/4 Turn).
(7) Rotate the crankshaft until the number 6 pis-
ton is at TDC.
(8) To ensure correct thrust bearing alignment the
following procedure must be done:
a. Move crankshaft all the way to the rear of its
travel.
b. Then, move crankshaft all the way to the front
of its travel.
c. Wedge an appropriate tool between the rear of
the cylinder block and rear crankshaft counter-
weight. This will hold the crankshaft in it’s most for-
ward position.
d. Tighten the #2 Thrust Bearing cap bolts to 41
N·m + 1/4 Turn (30 ft. lbs.+ 1/4 Turn). Remove the
holding tool.
(9) Install oil pan. (Refer to 9 - ENGINE/LUBRI-
CATION/OIL PAN - INSTALLATION)
(10) Fill engine crankcase with proper oil to cor-
rect level.
Fig. 95 Removing and Installing Upper Main Bearing
With Special Tool C- 3059
1 - SPECIAL TOOL C-3059
2 - BEARING
3 - SPECIAL TOOL C-3059
4 - BEARING
Fig. 96 Check for Stretched Bolts
1 - STRETCHED BOLT
2 - THREADS ARE NOT STRAIGHT ON LINE
3 - THREADS ARE STRAIGHT ON LINE
4 - UNSTRETCHED BOLT
9 - 168
ENGINE 3.8L
CS
CRANKSHAFT MAIN BEARINGS (Continued)
CRANKSHAFT
DESCRIPTION - 3.8L
The nodular iron crankshaft is supported by four
main bearings, with number two position providing
thrust bearing location (Fig. 97). Each main bearing
cap has two vertical retaining bolts. The two center
main caps have horizontal bolts to add increased
rigidity to the lower engine block (Fig. 97). Crank-
shaft end sealing is provided by front and rear rub-
ber seals.
STANDARD PROCEDURE - MEASURING
CRANKSHAFT END PLAY
(1)
Mount a dial indicator to front of engine with
the locating probe on nose of crankshaft (Fig. 98).
(2)
Move crankshaft all the way to the rear of its
travel.
(3)
Zero the dial indicator.
(4)
Move crankshaft all the way to the front and
read the dial indicator. (Refer to 9 - ENGINE -
SPECIFICATIONS) for end play specification.
REMOVAL
(1) Remove the engine assembly (Refer to 9 -
ENGINE - REMOVAL).
(2) Separate transaxle from engine.
(3) Mount engine on an engine stand.
(4) Remove the oil filter.
(5) Remove the oil pan and oil pick-up tube (Refer
to
9
-
ENGINE/LUBRICATION/OIL
PAN
-
REMOVAL).
(6) Remove the timing chain cover (Refer to 9 -
ENGINE/VALVE TIMING/TIMING CHAIN COVER -
REMOVAL).
(7) Remove timing chain and sprockets (Refer to 9
- ENGINE/VALVE TIMING/TIMING CHAIN AND
SPROCKETS - REMOVAL).
(8) Remove crankshaft rear oil seal and retainer
(Refer to 9 - ENGINE/ENGINE BLOCK/CRANK-
SHAFT OIL SEAL - REAR - REMOVAL).
NOTE: The 3.8L can have any number or combina-
tion of standard forged or cracked connecting rod
caps. Do not mix or interchange the rod caps.
(9) Rotate the crankshaft until connecting rod cap
is accessible.
(10) Paint mark or scribe the connecting rod cap
position.
Fig. 97 CRANKSHAFT AND BLOCK - 3.8L
1 - MAIN BEARING CAP No. 4
2 - MAIN BEARING CAP No. 3
3 - MAIN BEARING CAP No. 2
4 - MAIN BEARING CAP BOLT
5 - MAIN BEARING CAP No. 1
6 - THRUST MAIN BEARING - LOWER
7 - THRUST MAIN BEARING - UPPER
8 - MAIN BEARING CAP CROSS BOLT
9 - ENGINE BLOCK
10 - MAIN BEARING - UPPER
11 - CRANKSHAFT
12 - MAIN BEARING - LOWER
Fig. 98 Crankshaft End Play—Typical
CS
ENGINE 3.8L
9 - 169
(11) Remove connecting rod bearing cap. Use care
to prevent damage to the crankshaft bearing sur-
faces.
(12) Repeat removal procedure for each connecting
rod cap.
(13) Remove and discard the main bearing cross
bolts and washers. (Fig. 99)
NOTE: Install new cross bolt and washer assembly
upon reassembly.
(14) Remove the main bearing cap bolts (Fig. 99)
(15) Remove the main bearing caps (Fig. 99).
(16) Remove the crankshaft from engine block
(Fig. 99).
INSTALLATION
(1) For main bearing identification, refer to (Fig.
92). Lubricate with engine oil and install the crank-
shaft main bearing halves in the engine block.
(2) Position the crankshaft in engine block (Fig.
101).
(3) Perform main bearing fitting procedure (Refer
to 9 - ENGINE/ENGINE BLOCK/CRANKSHAFT
MAIN BEARINGS - STANDARD PROCEDURE).
(4) Inspect main cap bolts for stretching (Fig. 100).
Replace bolts that are stretched.
NOTE: The main cap bolts should be examined
before reuse. Bolt stretch can be checked by hold-
ing a scale or straight edge against the threads. If
all the threads do not contact the scale the bolt
must be replaced (Fig. 100).
(5) Install
the
main
bearing
caps
and
bolts.
Tighten bolts to 41 N·m (30 ft. lbs.) plus
1
⁄
4
turn.
NOTE: Install new cross bolt and washer assembly
upon reassembly.
(6) Install and tighten the NEW cross bolts and
washer assemblies to 61 N·m (45 ft. lbs.) (Fig. 101).
(7) Position and install the connecting rod and
bearing caps on the crankshaft (Refer to 9 -
ENGINE/ENGINE
BLOCK/CONNECTING
ROD
BEARINGS - STANDARD PROCEDURE).
(8) Install the crankshaft rear oil seal (Refer to 9 -
ENGINE/ENGINE
BLOCK/CRANKSHAFT
OIL
SEAL - REAR - INSTALLATION).
(9) Install the crankshaft sprocket (Refer to 9 -
ENGINE/VALVE
TIMING/TIMING
CHAIN
AND
SPROCKETS - INSTALLATION).
(10) Install
the
timing
chain
and
camshaft
sprocket (Refer to 9 - ENGINE/VALVE TIMING/TIM-
ING CHAIN AND SPROCKETS - INSTALLATION).
Fig. 99 CRANKSHAFT AND BLOCK - 3.8L
1 - MAIN BEARING CAP No. 4
2 - MAIN BEARING CAP No. 3
3 - MAIN BEARING CAP No. 2
4 - MAIN BEARING CAP BOLT
5 - MAIN BEARING CAP No. 1
6 - THRUST MAIN BEARING - LOWER
7 - THRUST MAIN BEARING - UPPER
8 - MAIN BEARING CAP CROSS BOLT
9 - ENGINE BLOCK
10 - MAIN BEARING - UPPER
11 - CRANKSHAFT
12 - MAIN BEARING - LOWER
Fig. 100 Check for Stretched Bolts
1 - STRETCHED BOLT
2 - THREADS ARE NOT STRAIGHT ON LINE
3 - THREADS ARE STRAIGHT ON LINE
4 - UNSTRETCHED BOLT
9 - 170
ENGINE 3.8L
CS
CRANKSHAFT (Continued)
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