Chrysler Town & Country/Voyager, Dodge Caravan, Plymouth Voyager. Manual — part 311
(3) Bore all cylinders to calculated boring finish
dimension. Then bore the final finish dimension (pis-
ton 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 directly
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 pres-
sure to the cylinder heads. It then
flows from a camshaft bearing cap one each cylinder
head through passages in the rocker shafts and is fed
to the rocker arm pivots, auto lash adjusters, and
camshaft journals (Fig. 1).
Fig. 18 Measure Piston
Fig. 1 Engine Oiling
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3.0L ENGINE
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OIL PAN
The oil pan is made of sheet metal and is provided
with a baffle-plate to prevent fluctuations in the oil
level while the vehicle is running (Fig. 2).
OIL PAN SEALING AND INSTALLATION
Oil pan to crankcase sealing is provided with Mopar
Silicone Rubber Adhesive Sealant or equivalent gasket
material. See Form-In-Place Gaskets in Standard Ser-
vice Procedures.
(1) Apply sealant as shown in (Fig. 3).
(2) Install pan and tighten screws to 6 N
Im (50 in.
lbs.) in sequence shown in (Fig. 4).
OIL PUMP SERVICE
The oil pump assembly is mounted on the timing belt
end of the cylinder block with the inner pump rotor
indexed and installed on the crankshaft nose. (Fig. 5).
The oil pump case also retains the crankshaft front
oil seal and provides oil pan front end closure.
REMOVAL
Remove accessory drive system. Refer to Accessory
Drive Service in this group.
Remove 5 bolts that attach oil pump to block (Fig. 6).
INSPECTION OIL PUMP
(1) Check oil pump case for damage and remove rear
cover.
(2) Remove pump rotors and inspect case for exces-
sive wear.
(3) Measure clearance between case and inner rotor
(Fig. 8).
(4) Insert the rotor into the oil pump case (Figs. 9
and 10) and measure clearance with a feeler gauge as
indicated.
(5) Replace if out of limits.
Fig. 2 Oil Pan
Fig. 3 Oil Pan Sealing
Fig. 4 Oil Pan Screw Tightening Sequence
Fig. 5 Oil Pump-Installed
Fig. 6 Oil Pump Assembly
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3.0L ENGINE
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OIL RELIEF PLUNGER
(1) Check that the oil relief plunger slides smoothly.
(2) Check for broken relief spring.
INSTALLATION
(1) Clean block and pump surfaces.
(2) Install new gasket (Fig. 7) make sure correct
length bolts are used (Fig. 6).
(3) Torque bolts to 13 N
Im (120 in. lbs.).
CHECKING ENGINE OIL PRESSURE
Check oil pressure using gauge at oil pressure switch
location. Oil pressure should be 41 kPa ( 6 psi.) at idle
or 241 to 517 kPa (35 to 75 psi.) at 3000 RPM.
(1) Remove pressure sending unit and install oil
pressure gauge. (Fig. 11)
CAUTION: If oil pressure is 0 at idle, Do Not Run
engine at 3000 RPM.
(2) Warm engine at high idle until thermostat opens.
Fig. 7 Oil Pump Components
Fig. 8 Inner Rotor to Case
Fig. 9 Checking Clearance-Between Outer Rotor and
Case
Fig. 10 Checking Rotor End Clearance
Fig. 11 Checking Oil Pump Pressure
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3.0L ENGINE
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OIL FILTER AND BRACKET
BRACKET
INSPECTION
(1) Check the oil filter mounting surface. The sur-
face must be smooth, flat and free of debris or old
pieces of rubber (Fig. 12).
(2) Check bracket for cracks and oil leaks.
OIL FILTER
(1) Turn counter clockwise to remove.
(2) To install, lubricate new filter gasket. Screw
filter on until gasket contacts base. Tighten 1 turn.
Fig. 12 Oil Filter and Bracket
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3.0L ENGINE
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