Dodge RAM TRUCK 1500 1995 Service Manual page 883

The MINIMUM oil pump pressure Is 41.4 ki'-a
( G
psi) at curb idle. The MAXIMUM oil pump pressure
Is 207-552 kPa (80-80 psi) at 3,000 EPM or more.
CAUTION: if oil pressure Is ZERO at curb idle, DO
NOT run engine at 3,000 RPM.
REMOVAL
(1) Remove the oil pan,
(2) Remove the oil pump from rear main bearing
cap.
DISASSEMBLE
(1) Remove the relief valve as follows:
(a) Remove cotter pin. Drill a 3.175 mm (1/8
Inch) hole Into the relief valve retainer cap and in­
sert a self-threading sheet metal screw into cap.
(b) Clamp screw Into a vise and while supporting
oil pump, remove cap b j tapping pump body using
a soft hammer. Discard retainer cap and remove
spring and relief valve (Fig. 4).
OIL PUMP ASSEMrr* ~ * .
Fig, 4 Oil Prmsum Relief Valve
(2) Remove oil pump cover (Fig. 5).
(3) Remove pump outer rotor and inner rotor with
shaft (Fig. 5).
(4) 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 assembly If cover Is scratched
-or grooved.
Lay a straightedge across the pump cover surface
(Fig. 8). If a 0.038 mm (0,0015 Inch) feeler gauge can
be Inserted between cover and straightedge, pump
assembly should be replaced.
Fig. § 'OhBGkmg r Jii Pump Oover Flatness
Measure thickness and diameter of outer rotor. If
outer rotor thickness measures 20.9 mm (0.825 inch)
or less or If the diameter Is 62.7 mm (2.469 Inches) or
less, replace outer rotor (Fig. 7).
Fig. 7 Measuring Outer Rotor Thickness
If inner rotor measures 20.9 mm (0.825 Inch) or
less, replace Inner rotor and shaft assembly (Fig. 8).
Slide outer rotor Into pump body. Press rotor to the
side with your fingers and measure clearance be­
tween rotor and pump body (Fig. 9). If clearance is
0.356 mm (0,014 Inch) or more, replace oil pump as­
sembly