Dodge ram truck 3500 1996 Service Manual page 1039

B R
3 J L ENGINE 9 - 49
C L E A N I N G ANP INSPECTION (Continued)
PISTON AND CONNECTING ROD INSPECTION
Check the crankshaft connecting rod journal for
excessive wear, taper and scoring.
Check the cylinder block bore for out-of-round,
taper, scoring and scuffing.
Check the pistons for taper and elliptical shape
before they are fitted Into the cylinder bore (Fig. 60).
PISTON PIN BORE DIAMETER
A
PISTON
SIZE
A DIA = PISTON DIAMETER BORE DIAMETER
PISTON
SIZE MIN. mm (IN.) MAX. mm (IN.) MIN. mm (IN.) MAX. mm (IN.)
A
99.280 (3.9087) 99.294 (3.9092) 99.306 (3.9097) 99.319(3.9102)
B 99.294 (3.9092) 99.306 (3.9097) 99.319(3.9102) 99.332 (3.9107)
c 99.306 (3.9097) 99.319(3.9102) 99.332 (3.9107) 99.344(3.9112)
D
99.319(3.9102) 99.332 (3.9107) 99:344(3.9112) 99.357(3.9117)
E
99.332 (3.9107) 99.344 (3.9112) 99.357 (3.9117) 99.370(3,9122)
J9509-80
Fig. 60 Piston Measurements
CRANKSHAFT INSPECTION OF JOURNALS
The crankshaft connecting rod and main journals
should be checked for excessive wear, taper or scor­
ing. The maximum taper or out-of-round on any
crankshaft journal is 0.025 mm (0.001 in.).
Journal grinding should not exceed 0.305 mm
(0.012 in.) under the standard journal diameter. DO
NOT grind thrust faces of No. 2 main bearing. DO
NOT nick crank pin or bearing fillets. After grinding,
remove rough edges from crankshaft oil holes and
clean out all oil passages.
CAUTION: After any journal grind, it is important
that the final paper or cloth polish be in the same
direction that the engine rotates.
OIL PUMP
OIL PUMP PRESSURE
The MINIMUM oil pump pressure is 41.4 kPa (6
psi) at curb idle. The MAXIMUM oil pump pressure
is 207-552 kPa (30-80 psi) at 3,000 RPM or more.
CAUTION: If oil pressure is ZERO at curb idle, DO
NOT run engine at 3,000 RPM.
INSPECTION
Mating surface of the oil pump cover should be
smooth. Replace pump assembly i f cover is scratched
or grooved.
Lay a straightedge across the pump cover surface
(Fig. 61). I f a 0.038 mm (0.0015 in.) feeler gauge can
be inserted between cover and straightedge, pump
assembly should be replaced.
8020cd6e
Fig. 61 Checking Oii Pump Cover Flatness
Measure thickness and diameter of outer rotor. I f
outer rotor thickness measures 20.9 mm (0.825 in.)
or less, or i f the diameter is 62.7 mm (2.469 in.) or
less, replace outer rotor (Fig. 62).
Fig. 62 Measuring Outer Rotor Thickness