Chrysler Le Baron, Dodge Dynasty, Plymouth Acclaim. Manual — part 582

3.0L ENGINE

INDEX

page

page

Accessory Drive Belt Service

. . . . . . . . . . . . . . . . 70

Auto Lash Adjuster

. . . . . . . . . . . . . . . . . . . . . . . 75

Camshaft Service

. . . . . . . . . . . . . . . . . . . . . . . . 76

Checking Engine Oil Pressure

. . . . . . . . . . . . . . . 93

Crankshaft and Cylinder Block, Assembly Service . 86
Cylinder Block

. . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Cylinder Head

. . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Cylinder Head and Camshaft Service

. . . . . . . . . 75

Engine Assembly

. . . . . . . . . . . . . . . . . . . . . . . . . 69

Engine Lubrication System

. . . . . . . . . . . . . . . . . 91

Engine Mounts

. . . . . . . . . . . . . . . . . . . . . . . . . . 68

Engine Specifications

. . . . . . . . . . . . . . . . . . . . . 95

General Information

. . . . . . . . . . . . . . . . . . . . . . . 66

Oil Filter and Bracket

. . . . . . . . . . . . . . . . . . . . . 94

Oil Pan

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Oil Pump Service

. . . . . . . . . . . . . . . . . . . . . . . . 92

Piston and Connecting Rod Assembly Service

. . . 82

Timing Belt Inspection—In Vehicle

. . . . . . . . . . . . 72

Timing Belt Service

. . . . . . . . . . . . . . . . . . . . . . . 72

Valve Service

. . . . . . . . . . . . . . . . . . . . . . . . . . . 80

GENERAL INFORMATION

ENGINE IDENTIFICATION NUMBER OR CODE

The engine identification number is located on the

rear of the cylinder block just below the cylinder
head (Fig. 1).

BLOCK: The cylinder block is a light weight de-

sign created by reducing thickness in many parts
and a short 10 mm (3/8 inch) block skirt. High rigid-
ity is provided with ribs cast in the outer wall, a full
length water jacket, and a monoblock or beam type,

main bearing cap. This single unit four bearing cap
is designed to control vibration of the cylinder block
partition walls.

CRANKSHAFT: A six throw, five weight crank-

shaft is supported by four main bearings with num-
ber three being the thrust bearing. The six separate
connecting rod throws pins reduce torque fluctua-
tions while a torsional vibration damper is used to
control torsion caused vibration of the crankshaft.
Rubber lipped seals are used at front and rear. The
front seal is retained in the oil pump case and the
rear is retained in a block-mounted housing.

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PISTONS: Are aluminum alloy with a steel strut,

short height, and thin wall so as to be autothermic
and light weight. The piston head with valve re-
cesses, in combination with the cylinder head, forms
a compact spherical head with clearance for total
valve lift with pistons at top dead center. The piston
skirt, top and second ring lands are finished to a ta-
pered roughness for oil retention and high resistance
to scuffing. Piston pins, press-fitted into place, join
the pistons to the connecting rods.

CYLINDER HEAD: The alloy cylinder heads fea-

ture cross-flow type intake and exhaust ports. Valve
guides and inserts are hardened cast iron. Valves of
heat resistance steel are arranged in a V with each
camshaft on center. To improve combustion speed the
chambers are a compact spherical design with a
squish area of approximately 30 percent of the piston
top area. The cylinder heads are common to either
cylinder bank by reversing the direction of installa-
tion.

CAMSHAFTS: Two overhead camshafts provide

valve actuation, one front (radiator side of cylinder
bank) and one rear. The front camshaft is provided
with a distributor drive and is longer. Both cam-
shafts are supported by four bearing journals, thrust
for the front camshaft is taken at journal two and
the rear at journal three. Front and rear camshaft
driving sprockets are interchangeable. The sprockets
and the engine water pump are driven by a single
notched timing belt.

ROCKER ARM SHAFTS: The shafts are retained

by the camshaft bearing journal caps. Four shafts are
used, one for each intake and exhaust rocker arm as-
sembly on each cylinder head. The hollow shafts pro-
vide a duct for lubricating oil flow from the cylinder
head to the valve mechanisms.

ROCKER ARMS: Are of light weight die-cast

with roller type follower operating against the cam
shaft. The valve actuating end of the rocker arms are
machined to retain hydraulic lash adjusters, elimi-
nating valve lash adjustment.

VALVES: Are made of heat resistant steel and are

further treated to resist heat.

VALVE SPRINGS: Are especially designed to be

short. The valve spring wire cross-section is oval

SPECIFICATIONS

Fig. 1 Engine Identification

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shaped and provides the same spring tension as
longer springs. Valve spring retainers, locks and
seals are conventional.

INTAKE MANIFOLD: The aluminum alloy man-

ifold is a cross type with long runners to improve in-
ertia. The runners, attaching below at the cylinder
head, also attach above and support an air plenum.
The air plenum chamber absorbs air pulsations cre-
ated during the suction phase of each cylinder.

EXHAUST MANIFOLDS: Both manifolds are a

log style made of ductile cast iron. Exhaust gasses,
collected from the front cylinder bank, leave the
front manifold through an end outlet and are fed
through an upper crossover tube to the rear mani-
fold. The collected exhaust from both manifolds are
combined, and exit to the exhaust pipe through an
articulated joint.

ENGINE LUBRICATION: System is a full flow

filtration, pressure feed type. The oil pump is
mounted in the chaincase cover. The pump inner ro-
tor is driven by the crankshaft. The engine oil pan
contains a baffle plate to control oil level fluctuation
during engine operation.

ENGINE MOUNTS

REMOVAL AND INSTALLATION

RIGHT SIDE MOUNT

(1) Remove the right engine mount insulator ver-

tical fasteners from frame rail.

(2) Remove the load on the engine motor mounts

by carefully supporting the engine and transmission
assembly with a floor jack.

(3) Remove the thru bolt from the insulator assem-

bly. Remove insulator.

(4) Reverse removal procedure for installation. Re-

fer to (Fig. 2) for bolt tightening specifications.

(5) Engine mount adjustment, Refer to Engine

Mount Insulator Adjustment of this section.

FRONT MOUNT

(1) Support the engine and transmission assembly

with a floor jack so it will not rotate.

(2) Remove the thru bolt from the insulator and

front crossmember mounting bracket.

(3) Remove the front engine mount bracket to

front crossmember screws and nuts. Remove the in-
sulator assembly.

(4) Reverse removal procedure for installation. Re-

fer to (Fig. 2) for bolt tightening specifications.

(5) Engine mount adjustment, Refer to Engine

Mount Insulator Adjustment of this section.

Fig. 2 Engine Mounting

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LEFT SIDE MOUNT

(1) Raise vehicle on hoist and remove left front

wheel.

(2) Remove inter splash shield.
(3) Support the transmission with a transmission

jack.

(4) Remove the insulator thru bolt from the mount.
(5) Remove the transmission mount fasteners and

remove mount.

(6) Reverse removal procedure for installation. En-

sure that the slide tube is seated into the rail
bracket guides. Refer to (Fig. 3) for bolt tightening
specifications.

(7) Engine mount adjustment, Refer to Engine

Mount Insulator Adjustment of this section.

ENGINE MOUNT RUBBER INSULATORS

Insulator location on (right side) and transmission

bracket (left side) are adjustable to allow right/left
drive train adjustment in relation to drive shaft as-
sembly length.

Check and reposition right engine mount insulator

(left engine mount insulator is floating type and will
adjust automatically (Fig. 3). Adjust drive train posi-
tion, if required, for the following conditions:
• Drive shaft distress: See Driveshafts in Suspen-
sion, Group 2.
• Any front end structural damage (after repair).

• Insulator replacement.

ENGINE MOUNT INSULATOR ADJUSTMENT

(1) Remove the load on the engine motor mounts

by carefully supporting the engine and transmission
assembly with a floor jack.

(2) Loosen the right engine mount insulator yoke

screw and two turns on yoke nut, then loosen the
front engine mount bracket to front crossmember
screws and nuts.

Left engine mount insulator is sleeved over

shaft and long support bolt to provide lateral
movement adjustment with engine weight re-
moved or not.

(3) Pry the engine right or left as required to

achieve the proper drive shaft assembly length. See
Drive Shaft in Suspension Group 2 for driveshaft
identification and related assembly length measur-
ing.

(4) Tighten right engine mount insulator yoke nut

to 102 N

Im (75 ft. lbs.). Then tighten front engine

mount screws and nuts to 54 N

Im (40 ft. lbs.) and

center left engine mount insulator.

(5) Recheck drive shaft length.

ENGINE ASSEMBLY

REMOVAL

(1) Disconnect battery.
(2) Mark hood position at hinges and remove hood.

(3) Drain cooling system. Refer to Cooling System

Group 7 for draining procedure.

(4) Disconnect all electrical connections.
(5) Remove coolant hoses from radiator and en-

gine.

(6) Remove radiator and fan assembly.
(7) See Fuel System Group 14, For procedures to

release fuel pressure, disconnect fuel lines and accel-
erator cable.

(8) Remove air cleaner assembly.
(9) Hoist vehicle and drain engine oil.
(10) Remove air conditioning compressor mounting

bolts and set compressor aside.

(11) Disconnect exhaust pipe at manifold.
(12) Remove transmission inspection cover and

mark flex plate to torque converter position.

(13) Remove screws holding torque converter to

flex plate and attach C-clamp on bottom of converter
housing to prevent torque converter from coming out.

(14) Remove power steering pump mounting bolts

and set pump aside.

(15) Remove

two

lower

transmission

to

block

screws.

(16) Remove starter.
(17) Lower vehicles and disconnect vacuum lines

and ground strap.

(18) Install transmission holding fixture.
(19) Attach engine lifting hoist and support en-

gine.

(20) Remove upper transmission case to block

bolts.

(21) See Engine Mounting in (Fig. 2) and separate

mount/insulators as follows:

(a) Mark RIGHT insulator on right yoke and en-

gine plate supports. Remove insulator to rails
screws.

(b) Remove FRONT engine mount through bolt

and nut.

Fig. 3 Left Insulator Movement

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