Dodge 2001 Ram 1500 Owner's Manual page 1447

9 - 300 ENGINE 5.9L DIESEL
OIL PUMP (Continued)
Fig. 159 Oil Pump Removal/Installation
1 - OIL PUMP
2 - BOLT (4)
(6) Measure the tip clearance (Fig. 161). Maximum
clearance is 0.1778 mm (0.007 inch). If the oil pump
is out of limits, replace the pump.
(7) Measure the clearance of the gerotor drive/
gerotor planetary to port plate (Fig. 162). Maximum
clearance is 0.127 mm (0.005 inch). If the oil pump is
out of limits, replace the pump.
(8) Measure the clearance of the gerotor planetary
to the body bore (Fig. 163). Maximum clearance is
0.381 mm (0.015 inch). If the oil pump is out of lim-
its, replace the pump.
(9) Measure the gears backlash (Fig. 164). The
limits of a used pump is 0.075- 0.85 mm (0.0296-
0.0335 inch). If the backlash is out of limits, replace
the oil pump.
(10) Install the back plate.
INSTALLATION
(1) Lubricate the pump with clean engine oil. Fill-
ing the pump with clean engine oil during installa-
tion will help to prime the pump at engine start up.
(2) Verify the idler gear pin is installed in the
locating bore in the cylinder block.
(3) Install the pump (Fig. 159). Tighten the oil
pump mounting bolts in two steps, in the sequence
shown in (Fig. 165).
• Step 1—Tighten to 5 N·m (44 in. lbs.) torque.
• Step 2—Tighten to 24 N·m (18 ft. lbs.) torque.
(4) The back plate on the pump seats against the
bottom of the bore in the cylinder block. When the
pump is correctly installed, the flange on the pump
will not touch the cylinder block.
(5) Measure the idler gear to pump drive gear
backlash and the idler gear to crankshaft gear back-
lash (Fig. 166). The backlash should be 0.75- 0.85
Fig. 160 Gerotor Planetary and Gerotor
1 - OIL PUMP BACK PLATE
2 - GEROTOR
3 - GEROTOR PLANETARY
Fig. 161 Measuring Tip Clearance
1 - FEELER GAUGE
Fig. 162 Measuring Gerotor to Port Plate Clearance
1 - PORT PLATE
2 - GEROTOR
mm (0.0296-0.0335 inch). If the backlash is out of
limits, replace the oil pump.
(6) If the adjoining gear moves when you measure
the backlash, the reading will be incorrect.
BR/BE