Dodge Ram Truck 1500-2500-3500. Manual — part 1393
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
compressed to 57 mm (2.24 in.). 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 N·m (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 N·m (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. Install NEW oil 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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