1993 CHEVROLET PLYMOUTH ACCLAIM low oil pressure

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
9 - 68 3.0L ENGINE Ä

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:
² Drive shaft distress: See Driveshafts in Suspen-
sion, Group 2.
² Any front end structural damage (after repair).
² 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
Ä 3.0L ENGINE 9 - 69

(clearance between piston O.D. and cylinder) minus
0.02 mm which is the boring margin. (3) Bore all cylinders to calculated boring finish di-
mension. Then bore the final finish dimension (piston
O.D. plus cylinder clearance). (4) Check clearance between piston and cylinder,
clearance should be 0.03 to 0.05 mm (.0012 to .002
inch).
ENGINE LUBRICATION SYSTEM
The lubrication system is a full flow filtration pres-
sure feed type. Oil, stored in the oil pan, is taken in
and discharged by a internal gear type oil pump di-
rectly coupled to the crankshaft and its pressure is
regulated by a relief valve. The oil is fed through an
oil filter and to the crankshaft journals from the oil gallery in the cylinder block. This gallery also feeds
oil under pressure to the cylinder heads. It then
flows from a camshaft bearing cap on each cylinder
head through passages in the rocker shafts to the
rocker arm pivots, auto lash adjusters, and camshaft
journals (Fig. 1).
Fig. 18 Measure Piston
Fig. 1 Engine Oiling
Ä 3.0L ENGINE 9 - 91

3.3/3.8L ENGINE INDEX
page page
Camshaft .............................. 112
Camshaft BearingsÐEngine Removed From Vehicle .............................. 113
Checking Engine Oil Pressure .............. 125
Connecting Rods ........................ 118
Crankshaft Oil Seals Service ............... 121
Crankshaft Service ...................... 118
Cylinder Block, Piston and Connecting Rod Assembly Service ...................... 114
Cylinder Heads ......................... 102
Engine Assembly ........................ 101
Engine Core Oil and Cam Plugs ............ 113
Engine Lubrication System ................ 122 Engine Mounts
.......................... 99
Engine Specifications ..................... 126
General Information ....................... 98
Hydraulic Tappets ....................... 108
Installing Piston and Connecting Rod Assembly . 117
Intake Manifold Sealing ................... 104
Oil Filter .............................. 125
Oil Pan Service ......................... 122
Oil Pump Service ....................... 123
Rocker Arms and Shaft Assembly ........... 102
Timing Chain Cover, Oil Seal and Chain ...... 109
Valve Service .......................... 104
Valve Timing ........................... 109
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. 2). ENGINE: The 3.3L (201 Cubic. Inches.) and 3.8L
(231 Cubic. Inches.) displacement engines are 60É V
type six cylinder power plant with cast iron cylinder
block and aluminum cylinder heads (Fig. 1). Firing
order for these engines is 1-2-3-4-5-6. High turbu-
lence cylinder heads allow a 8.9-1 compression ratio. CRANKSHAFT: The nodular iron crankshaft is
supported by four main bearings, with number two being the thrust bearing. Crankshaft end sealing is
provided by front and rear rubber seal. PISTONS: The pistons are cast aluminum alloy.
Three rings are used. Piston pins, press fitted into
place, join the pistons to forged steel connecting rods. CAMSHAFT: The nodular iron camshaft is
mounted in four steel backed babbitt bearings. A
thrust plate located in front of the first bearing, and
bolted to the block, controls end play. Silent timing
chain drives the camshaft. This chain is enclosed by
a cast aluminum cover which also carries a front
crankshaft seal, provides front oil pan closure, water
pump mounting.
SPECIFICATIONS
9 - 98 3.3/3.8L ENGINE Ä

length of the spring to be tested is 33.34mm (1-5/16
inches). Turn table of Tool C-647 until surface is in line
with the 33.34mm (1-5/16 inch) mark on the threaded
stud and the zero mark on the front. Place spring over
stud on the table and lift compressing lever to set tone
device. Pull on torque wrench until ping is heard. Take
reading on torque wrench at this instant. Multiply this
reading by two. This will give the spring load at test
length. Fractional measurements are indicated on the
table for finer adjustments. Refer to specifications to
obtain specified height and allowable tensions. Discard
the springs that do not meet specifications.
VALVE INSTALLATION
(1) Coat valve stems with clean engine oil and insert
them in cylinder head. (2) Check valve tip to spring seat dimension A after
grinding the valve seats or faces. Grind valve tip to give
49.541 to 51.271 mm (1.950 to 2.018 inch.) over spring
seat when installed in the head (Fig. 17). Check valve
tip for scoring, if necessary, the tip chamfer should be
reground to prevent seal damage when the valve is
installed. (3) Install new cup seals on all valve stems and over
valve guides (Fig. 24). Install valve springs and valve
retainers.
(4) Compress valve springs with Valve Spring Com-
pressor Tool C-3422-B, with adapter 6412 install locks
and release tool. If valves and/or seats are re-
ground, measure the installed height of springs
dimension B, make sure measurements is taken
from top of spring seat to the bottom surface of
spring retainer. If height is greater than 1-19/32
inches, (40.6mm), install a 1/32 inch (.794mm)
spacer in head counterbore to bring spring
height back to normal 1-17/32 to 1-19/32 inch (39.1
to 40.6mm) .
REPLACE VALVE STEM SEALS OR VALVE
SPRINGS, CYLINDER HEAD NOT REMOVED
(1) Perform fuel system pressure release procedure
before attempting any repairs (2) Disconnect negative battery cable. (3) Remove Air Cleaner Cover and hose assembly.
(4) Remove Intake Manifold; Refer to
Intake/Exhaust Manifold 3.3/3.8L Engine Group 11
Exhaust System and Intake Manifolds of this manual
for removal procedure. (5) Remove cylinder head covers and spark plugs.
(6) Remove connector wire from ignition coils.
(7) Using suitable socket and flex handle at crank-
shaft pulley retaining screw, turn engine so the num-
ber 1 piston is at Top Dead Center on the compression
stroke. (8) Remove rocker arms with rocker shaft and in-
stall a dummy shaft. The rocker arms should not be
disturbed and left on shaft. (9) With air hose attached to spark plug adapter
installed in number 1 spark plug hole, apply 90 to 100
psi air pressure (620.5 to 689 kPa). This is to hold
valves into place while servicing components. (10) Using Tool C-4682 or Equivalent compress
valve spring and remove retainer valve locks and valve
spring. (11) The intake valve stem seals should be pushed
firmly and squarely over the valve guide using the
valve stem as guide. Do Not Forceseal against top of
guide. When installing the valve retainer locks, com-
press the spring only enoughto install the locks.
CAUTION:Do not pinch seal between retainer and top
of valve guide .
(12) Follow the same procedure on the remaining 5
cylinders using the firing sequence 1-2-3-4-5-6. Make
sure piston in cylinder is at TDC on the valve
spring that is being covered. (13) Remove spark plug adapter tool .
(14) Remove dummy shaft and install rocker shaft
assembly and tighten screws to 28 N Im (250 in. lbs.).
Fig. 24 Checking Valve Installed Height
Fig. 25 Installing Valve, Cup Seal, Spring and Re-
tainer
Ä 3.3/3.8L ENGINE 9 - 107

(15) Install rocker arm covers tighten screws to 14
N Im (120 in. lbs.) and connector to ignition coils.
(16) Install Intake Manifold; Refer to Intake Mani-
fold Installation 3.3/3.8L Engine, Group 11 Exhaust
System and Intake Manifold.
HYDRAULIC TAPPETS
The valve train includes roller tappet assemblies,
aligning yokes and yoke retainer. Roller tappet alignment is maintained by machined
flats on tappet body being fitted in pairs into six
aligning yokes. The yokes are secured by an alignment
yoke retainer (Fig. 26).
PRELIMINARY STEP TO CHECKING THE HY- DRAULIC TAPPETS
Before disassembling any part of the engine to cor-
rect tappet noise, read the oil pressure at the gauge.
Install a reliable gauge at pressure sending unit if
vehicle has no oil pressure gauge and check the oil level
in the oil pan. The pressure should be between 30 and
80 psi (206.8 to 551.6 kPa) at 2000 rpm. The oil level in the pan should never be above the
MAX mark on dipstick, or below the MIN mark. Either
of these two conditions could be responsible for noisy
tappets. Oil Level Check: stop engine after reach-
ing normal operating temperature . Allow 5 min-
utes to stabilize oil level, check dipstick.
OIL LEVEL TOO HIGH
If oil level is above the MAX mark on dip stick, it is
possible for the connecting rods to dip into the oil while
engine is running and create foam. Foam in oil pan
would be fed to the hydraulic tappets by the oil pump
causing them to become soft and allow valves to seat
noisily.
OIL LEVEL TOO LOW
Low oil level may allow pump to take in air which
when fed to the tappets, causes them to become soft
and allows valves to seat noisily. Any leaks on intake
side of pump through which air can be drawn will
create the same tappet action. Check the lubri- cation system from the intake strainer to the pump
cover, including the relief valve retainer cap. When
tappet noise is due to aeration, it may be intermittent
or constant, and usually more than one tappet will be
noisy. When oil level and leaks have been corrected,
engine should be operated at fast idle to allow all of the
air inside of the tappets to be bled out.
VALVE TRAIN NOISE DIAGNOSIS
To determine source of valve train noise, operate
engine at idle with cylinder head covers removed and
listen for source of the noise. Worn valve guides or cocked springs are some-
times mistaken for noisy tappets. If such is the
case, noise may be dampened by applying side
thrust on the valve spring. If noise is not appre-
ciably reduced, it can be assumed the noise is in
the tappet. Inspect the rocker arm push rod
sockets and push rod ends for wear. Valve tappet noise ranges from light noise to a heavy
click. A light noise is usually caused by excessive
leakdown around the unit plunger which will necessi-
tate replacing the tappet, or by the plunger partially
sticking in the tappet body cylinder. A heavy click is
caused either by a tappet check valve not seating, or by
foreign particles becoming wedged between the
plunger and the tappet body causing the plunger to
stick in the down position. This heavy click will be
accompanied by excessive clearance between the valve
stem and rocker arm as valve closes. In either case,
tappet assembly should be removed for inspection and
cleaning.
TAPPET REMOVAL
(1) Refer to Cylinder Head Removal of this section to
remove intake manifold and cylinder heads for access
to tappets for service. (2) Remove yoke retainer and aligning yokes.
(3) Use Tool C-4129 to remove tappets from their
bores. If all tappets are to be removed, identify tappets
to insure installation in original location. If the tappet or bore in cylinder block is scored,
scuffed, or shows signs of sticking, ream the bore
to next oversize and replace with oversize tap-
pet.
CAUTION: The plunger and tappet bodies are not
interchangeable. The plunger and valve must always
be fitted to the original body. It is advisable to work on
one tappet at a time to avoid mixing of parts. Mixed
parts are not compatible. Do not disassemble a tap-
pet on a dirty work bench.
DISASSEMBLY (FIG. 27)
(1) Pry out plunger retainer spring clip.
Fig. 26 Roller Tappets Aligning Yoke and Retainer
9 - 108 3.3/3.8L ENGINE Ä

ENGINE LUBRICATION SYSTEM
The lubrication system is a full flow filtration pres-
sure feed type. Oil from the oil pan is pumped by a
internal gear type oil pump directly coupled to the
crankshaft. Its pressure is regulated by a relief valve
located in the Chain Case Cover. The oil is pumped
through an oil filter and feeds a main oil galley.This
oil gallery feeds oil under pressure to the main and
rod bearings, camshaft bearings. Passages in the cyl-
inder block feed oil to the hydraulic lifters and
rocker shaft brackets which feeds the rocker arm piv-
ots (Fig. 1).
OIL PAN SERVICE
REMOVAL
(1) Disconnect negative battery cable, remove en-
gine oil dipstick. (2) Raise vehicle. Drain engine oil.
(3) Remove oil pan screws and remove oil pan.
CLEANING AND INSPECTION
(1) Clean oil pan in solvent and wipe dry with a
clean cloth. Clean all gasket material from mounting
surfaces of pan and block. (2) Inspect oil drain plug and plug hole for stripped
or damaged threads and repair as necessary. Install
a new drain plug gasket. Tighten to 27 N Im (20 ft.
lb.). (3) Inspect oil pan mounting flange for bends or
distortion. Straighten flange if necessary. (4) Clean oil screen and pipe in clean solvent. In-
spect condition of screen.
INSTALLATION
(1) Install oil pick-up tube into Chain Case Cover
tighten screw to 28 N Im (250 in. lbs.) (Fig. 2).
(2) Apply a 1/8 inch bead of Mopar Silicone Rubber
Adhesive Sealant or equivalent, at the parting line of
the chain case cover and the rear seal retainer (Fig. 3). (3) Use a new pan gasket (Fig. 4).
(4) Install pan and tighten screws to 23 N Im (200 in.
lb.).
(5) Lower vehicle and install oil dipstick.
(6) Connect negative battery cable.
(7) Fill crankcase with oil to proper level.
Fig. 1 Engine Oiling System
Fig. 2 Oil Pump Pick-up Tube Service
9 - 122 3.3/3.8L ENGINE Ä

OIL PUMP SERVICE
It is necessary to remove the oil pan, oil pickup
and chain case cover (CCC) to service the oil pump
rotors. The oil pump pressure relief valve can be ser-
viced by removing the oil pan and oil pickup tube.
Refer to Timing Chain Cover Removal and Installa-
tion of this section for procedures.
DISASSEMBLY
(1) To remove the relief valve, proceed as follows: (a) Drill a 3.175mm (1/8 inch) hole into the relief
valve retainer cap and insert a self-threading sheet
metal screw into cap. (b) Clamp screw into a vise and while supporting
chain case cover (CCC), remove cap by tapping
CCC using a soft hammer. Discard retainer cap
and remove spring and relief valve (Fig. 5).
(2) Remove oil pump cover screws, and lift off
cover. (3) Remove pump rotors.
(4) Wash all parts in a suitable solvent and inspect
carefully for damage or wear (Fig. 6).
INSPECTION AND REPAIR
(1) Clean all parts thoroughly. Mating surface of
the chain case cover (CCC) should be smooth. Re-
place pump cover if scratched or grooved. (2) Lay a straightedge across the pump cover sur-
face (Fig. 7). If a .076mm (.003 inch) feeler gauge can
be inserted between cover and straight edge, cover
should be replaced. (3) Measure thickness and diameter of outer rotor.
If outer rotor thickness measures 7.64mm (0.0301
inch.) or less (Fig. 8), or if the diameter is 79.95mm
(3.148 inches.) or less, replace outer rotor. (4) If inner rotor measures 7.64mm (.301 inch) or
less replace inner rotor (Fig. 9).
(5) Slide outer rotor into CCC, press to one side
with fingers and measure clearance between rotor
and CCC (Fig. 10). If measurement is .39mm (.015
inch) or more, replace CCC only if outer rotor is in
specification. (6) Install inner rotor into CCC. If clearance be-
tween inner and outer rotors (Fig. 11) is .203mm
(.008 inch) or more, replace both rotors.
Fig. 3 Oil Pan Sealing
Fig. 4 Oil Pan Gasket Installation
Fig. 5 Oil Pressure Relief Valve
Fig. 6 Oil Pump
Ä 3.3/3.8L ENGINE 9 - 123