Dodge RAM TRUCK 1500 1995 Service Manual page 975

9 • 1 3 4 8 J L ENGINE — — — — — —
OIL PUMP
REMOVAL
(1) Remove the timing chain cover,
(2) Remove the relief valve plug, gasket, spring
and valve (Fig. 5). Discard the gasket.
PLUG
TIMING
Fig, 5 OII Pressure Relief Valve
(3) Remove oil pump cover (Fig. 6).
(4) Remove pump rotors (Fig. 6).
OUTER INNER
ROTOR ROTOR
TIMING CHAIN
COVER J9409-7!
Fig. 6 Oil Pump
GLEANING
Wash all parts in a suitable solvent and inspect
carefully for damage or wear.
INSPECTION
Mating surface of the oil pump cover should be
smooth. Replace pump cover if scratched or grooved.
B R
Lay a straightedge across the pump cover surface
(Fig. 7). If a 0.076 mm (0.003 inch) feeler gauge can
be inserted between cover and straightedge, cover
should be replaced.
> - 6 8
Fig. 7 Checking Oil Pump Cover Flatness
Measure thickness (Figs. 7 and 8) and diameter of
rotors. If either rotor thickness measures 18.92 mm
(0.744 inch) or less, or if the diameter is 82.45 mm
(3.246 inches) or less, replace rotor set.
Fig. 8 Measuring Outer Rotor Thickness
Slide outer rotor into timing chain cover pump
body. Press rotor to the side with your fingers and
measure clearance between rotor and pump body
(Fig. 10). If clearance is 0.19 mm (0.007 inch) or
more, and outer rotor is within specifications, replace
timing chain cover.
Install inner rotor into timing chain cover pump
body (Fig. 12). Inner rotor should be positioned with
chamfer up or toward engine when cover is installed.
This allows easy installation over crankshaft. If
clearance between inner and outer rotors is 0.150
mm (0.006 inch) or more, replace both rotors.
Place a straightedge across the face of the timing
chain cover pump body, between bolt holes (Fig. 12).