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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

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

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

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

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.

(5) Install

the

main

bearing

caps

and

bolts.

Tighten bolts to 41 N·m (30 ft. lbs.) plus

⁄

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

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

CRANKSHAFT (Continued)

Content .. 701 702 703 704 ..