Chrysler Le Baron, Dodge Dynasty, Plymouth Acclaim. Manual — part 587
CRANKSHAFT AND CYLINDER BLOCK, ASSEMBLY SERVICE
CRANKSHAFT SERVICE
The crankshaft is supported in four main bearings.
All upper bearing shells in the crankcase have oil
grooves. All lower bearing shells in stalled in the
monoblock main bearing cap are plain. Crankshaft
end play is controlled by thrust washers on the num-
ber three main bearing journal.
CRANKSHAFT—REMOVAL
(1) Remove front mounted oil pump assembly and
gasket (Figs. 1 and 2).
(2) Remove rear oil seal retainer and seal as as-
sembly (Fig. 3).
(3) Release monoblock main bearing cap bolts
evenly. Remove lower bearing shells and identify for
reassembly.
(4) Lift out crankshaft and remove upper thrust
washers from each side of number three main bear-
ing in the crankcase (Fig. 1).
INSPECTION
Visually check the main and connecting rod bear-
ing journals for wear, scuffs or scoring and replace if
necessary.
CRANKSHAFT OIL CLEARANCE
MECHANICAL MEASUREMENT
Measure the journal outside diameter and the main
bearing inside diameter (Figs. 4 and 5). If the clear-
ance exceeds the specifications limit (Fig. 6). Replace
the main bearing(s) and if necessary replace the
crankshaft.
Fig. 1 Crankshaft and Cylinder Block
Fig. 2 Oil Pump Assembly
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PLASTIGAGE MEASUREMENT
(1) Remove oil from journal and bearing shell.
(2) Install crankshaft.
(3) Cut plastigage to same length as width of the
bearing and place it in parallel with the journal axis.
(Fig. 7).
(4) Install the main bearing cap carefully and
tighten the bolts to specified torque.
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. 8). Refer to
specification (Fig. 6) for proper clearances. Also see
Measuring Main and Connecting Rod Bearing Clear-
ance in Standard Service Procedures.
CRANKSHAFT BEARINGS
INSTALLATION
(1) Install upper main bearing shells making cer-
tain oil holes are in alignment, and bearing tabs seat
in block tabs. All upper bearings have oil grooves
(Fig. 9).
THRUST BEARINGS. Crankshaft thrust bear-
ings (washers) are installed at journal #3 separately
from the radial bearings. Thrust bearings shown in
Fig. 3 Rear Seal Assembly
Fig. 4 Measure Crankshaft Journal O.D.
Fig. 5 Measure Main Bearing I.D.
Fig. 6 Crankshaft Clearance Specification
Fig. 7 Measure Oil Clearance with Plastigage
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(Fig. 9) are different, one has end positioning tabs,
while the other is plain. One pair of each thrust
washers are installed into the block and one pair
into the main bearing cap (Fig. 9).
(2) Apply a thin film of grease to plain side of
thrust washers and position them on each side of
number three main bearing. Grooved surface towards
crankshaft.
(3) Oil the bearings and journals and install crank-
shaft.
(4) Install lower main bearing shells without oil
grooves in monoblock cap.
(5) Install one pair of thrust washers in cap. Refer
to Thrust Bearings (Fig. 9).
(6) Carefully install bearing cap with arrows (Fig.
10) toward timing belt end.
(7) Oil the bearing cap bolt threads, install and
tighten bolts progressively in sequence shown in
(Fig. 9) to 80 N
Im (60 ft. lbs.) torque.
CHECKING CRANKSHAFT END PLAY
(1) Mount a dial indicator to front of engine, locat-
ing probe on nose of crankshaft (Fig. 11).
(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 (Fig. 6) for specifica-
tion.
CRANKSHAFT OIL SEALS SERVICE
REAR CRANKSHAFT SEAL RETAINER
(1) Install rear crankshaft oil seal in housing with
Special Tool MD998718 (Fig. 12).
(2) Apply (Mopar Silicone Rubber Adhesive Seal-
ant or equivalent) to oil seal housing (Fig. 13) per
procedure detailed in form-in-place gasket section in
Standard Service Procedures.
Fig. 9 Install Main Bearings
Fig. 8 Measuring Clearance
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(3) Apply light coating of engine oil to the entire
circumference of oil seal lip.
(4) Install seal assembly on cylinder block and
tighten bolts to 12 N
Im (104 in. lbs.)
FRONT CRANKSHAFT OIL PUMP AND OIL
SEAL
(1) Install oil pump gasket and oil pump case
(Figs. 1 and 14).
CAUTION: Install bolts, depending on length in lo-
cations shown in (Fig. 14).
(2) Using front crankshaft oil seal installer Special
Tool MB998306 install oil seal in oil pump (Fig. 15).
CYLINDER BLOCK
Inspect cylinder block for scratches, cracks and rust
or corrosion, and repair or replace as required.
Fig. 10 Crankshaft Main Bearing Cap
Fig. 11 Checking Crankshaft End Play
Fig. 12 Install Crankshaft Rear Oil Seal
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