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PUMP-OIL
REMOVAL
NOTE: The oil pump is serviced with the timing
chain cover.
1. Remove timing chain cover (1) (Refer to 9 -
ENGINE/VALVE TIMING/TIMING CHAIN COVER -
REMOVAL).
2. Disassemble oil pump (3) (Refer to 9 - ENGINE/
LUBRICATION/OIL PUMP - DISASSEMBLY).
3. Inspect oil pump parts (Refer to 9 - ENGINE/LU-
BRICATION/OIL PUMP - INSPECTION).
DISASSEMBLY
1. Remove oil pump cover screws (1) and lift off
cover.
2. Remove pump rotors.
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3. Remove oil pressure relief valve (1) and spring (2).
4. Wash all parts in a suitable solvent and inspect
carefully for damage or wear.
CLEANING
Clean all parts thoroughly. Mating surface of the chain case cover should be smooth. Replace pump cover if
scratched or grooved.
INSPECTION
1. Lay a straightedge (1) across the pump cover sur-
face. If a 0.076 mm (0.003 in.) feeler gauge (2) can
be inserted between cover and straight edge, cover
should be replaced.
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2. Measure thickness and diameter of rotors. if the
outer rotor diameter is 82.45 mm (3.246 in.) or
less, replace rotor set and.
3. If either rotor thickness measures 18.92 mm
(0.744 in.) or less, replace rotor set
4. Measure clearance between outer rotor (2) and
case. If measurement is 0.19 mm (0.007 in.) or
more, and outer rotor (2) is within specification,
replace chain case cover.
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5. Measure clearance between the outer rotor (2) and
inner rotor (3). If clearance between inner (3) and
outer rotors (2) is 0.150 mm (0.006 in.) or more,
replace rotor set.
6. Place a straightedge across the face of the chain
case cover, in between the bolt holes. If a feeler
gauge of 0.077 mm (0.003 in.) or more can be
inserted between rotors and the straightedge, and
the rotors are within specification, replace the case
cover.
7. Inspect oil pressure relief valve for scoring and free
operation in its bore. Small marks may be removed
with 400 grit wet or dry sandpaper.
8. The relief valve spring has a free length of approx-
imately 68.7 mm (2.70 in.) and should test between
10.2 kg and 12.4 kg (22.5 and 27.5 lbs.) when
compressedto57mm(2.24in.). Replace spring
that fails to meet specifications.
9. If oil pressure is low and pump is within specifica-
tions, inspect for worn engine bearings or other
reasons for oil pressure loss.
ASSEMBLY
1. Assemble pump using new parts as required.
2. Install spring (2) onto oil pressure relief valve (1).
3. Lubricate oil pressure relief valve and spring with
clean engine oil.
4. Install oil pressure relief valve (1) and spring (2).
5. Inspect relief valve plug o-ring (3). Replace as nec-
essary. Torque plug to 34 Nꞏm (25 ft. lbs.)
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6. Install pump rotors with chamfer side to the inside
of chain case cover.
7. Install oil pump cover and screws (1). Tighten
cover screws to 23 Nꞏm (200 in. lbs.).
8. Prime oil pump before installation by filling rotor
cavity with engine oil.
INSTALLATION
1. Assemble oil pump (3) (Refer to 9 - ENGINE/LU-
BRICATION/OIL PUMP - ASSEMBLY).
2. Prime oil pump before installation by filling rotor
cavity with the correct engine oil.
3. Install timing chain cover (Refer to 9 - ENGINE/
VALVE TIMING/TIMING CHAIN COVER - INSTAL-
LATION).
4. InstallNEWoil filter.
5. Fill the crankcase with the correct engine oil to the
proper level.
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SENSOR-OIL PRESSURE
REMOVAL
1. Disconnect oil pressure sensor electrical connector.
2. Remove oil pressure sensor (1).
INSTALLATION
1. Apply thread sealer to oil pressure sensor threads.
2. Install oil pressure sensor (1).
3. Connect electrical connector.
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SENSOR-OIL TEMPERATURE
REMOVAL
1. Disconnect oil temperature sensor electrical con-
nector.
2. Remove oil temperature sensor (5).
INSTALLATION
1. Apply thread sealer to oil temperature sensor
threads.
2. Install oil temperature sensor (5).
3. Connect electrical connector.
Page 2104 of 5267

BLOCK-ENGINE
DESCRIPTION
The cylinder block is made of a sand-cast aluminum alloy. The cylinder block has interference-fit cast iron cylinder
liners. The cylinder liners are thermally installed during block manufacturing; they are not serviceable items.
Six iron main bearing caps use four bolts per cap; two vertical and two horizontal. A crankshaft oil scraper is
attached to the main bearing caps via extended main bearing cap bolts and nuts.
STANDARD PROCEDURE - CYLINDER BORE HONING
Before honing, stuff plenty of clean shop towels under
the bores and over the crankshaft to keep abrasive
materials from entering the crankshaft area.
1. Used carefully, the Cylinder Bore Sizing Hone
C-823, equipped with 220 grit stones, is the best
tool for this job. In addition to deglazing, it will
reduce taper and out-of-round, as well as removing
light scuffing, scoring and scratches. Usually, a few
strokes will clean up a bore and maintain the
required limits.
CAUTION: DO NOT use rigid type hones to remove
cylinder wall glaze.
2. Deglazing of the cylinder walls may be done if the
cylinder bore is straight and round. Use a cylinder
surfacing hone, Honing Tool C-3501, equipped with
280 grit stones (C-3501-3810). about 20-60
strokes, depending on the bore condition, will be
sufficient to provide a satisfactory surface. Using
honing oil C-3501-3880, or a light honing oil, avail-
able from major oil distributors.
CAUTION: DO NOT use engine or transmission oil, mineral spirits, or kerosene.
3. Honing should be done by moving the hone up and down fast enough to get a crosshatch pattern. The hone
marks should INTERSECT at 50° to 60° for proper seating of rings.
4. A controlled hone motor speed between 200 and 300 RPM is necessary to obtain the proper crosshatch angle.
The number of up and down strokes per minute can be regulated to get the desired 50° to 60° angle. Faster up
and down strokes increase the crosshatch angle.
5. After honing, it is necessary that the block be cleaned to remove all traces of abrasive. Use a brush to wash
parts with a solution of hot water and detergent. Dry parts thoroughly. Usea clean, white, lint-free cloth to check
that the bore is clean. Oil the bores after cleaning to prevent rusting.
CLEANING
CAUTION: Remove all gasket material from cylinder block using a plastic gasket scraper and MoparBrake
Parts Cleaner or the equivalent, this will prevent damage to the cylinder block.
1. When cleaning the cylinder block, remove the oil gallery plugs at the front and rear of the block.
2. Spray compressed air into all oil gallery passages to ensure they are clear of blockage.
3. Use a wooden or plastic scraper and MOPAR
Brake Parts Cleaner or the equivalent to remove the old gasket.
4. Clean the oil passages in the crankshaft with a brush.