Chrysler RAM TRUCK 2500 1994 Service Manual page 883

9 - 162 5.9L (DIESEL) ENGINE •
Fig. 3 Gerotor Planetary and Gerotor
Inspect for excessive wear or damage.
Clean all parts in solvent and dry with compressed
air.
Inspect the pump housing and gerotor drive for
damaged and excessive wear.
Install the gerotor planetary in the original posi­
tion. The chamfer must be on the O.D. and down.
Measure the tip clearance (Fig. 4). Maximum clear­
ance is 0.1778 mm (0.007 inch). If the oil pump is out
of limits, replace the pump.
FEELER
G A U G E
J9109-21
Fig. 4 Tip Clearance
Measure the clearance of the gerotor drive/gerotor
planetary to port plate (Fig. 5). Maximum clearance
is 0.127 mm (0.005 inch). If the oil pump is out of
limits, replace the pump.
Fig. 5 Gerotor to Port Plate Clearance
Measure the clearance of the gerotor planetary to
the body bore (Fig. 6). Maximum clearance is 0.381
mm (0.015 inch). If the oil pump is out of limits, re­
place the pump.
Fig. 6 Gerotor Planetary to Body Bore Clearance
Measure the gears backlash (Fig. 7). The limits of a
used pump is 0.080-0.380 mm (0.003-0.015 inch). If
the backlash is out of limits, replace the oil pump.
Install the back plate.
OIL PUMP
J9109-24
Fig. 7 Measure Gear Backlash
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.
Make sure the idler gear pin is installed in the lo­
cating bore in the cylinder block.
(2) Install the pump. Tighten the oil pump mount­
ing bolts in two steps and in the sequence shown
(Fig. 2).
• Step 1—Tighten to 5 N-m (44 in. lbs.) torque.
• Step 2-Tighten to 24 N-m (18 ft. lbs.) torque.
(3) 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.
(4) Measure the idler gear to pump drive gear
backlash and the idler gear to crankshaft gear back­
lash (Fig. 8). The backlash should be 0.080-0.330 mm
(0.003-0.013 inch). If the backlash is out of limits, re­
place the oil pump drive gear and the idler gear.
(5) If the adjoining gear moves when you measure
the backlash, the reading will be incorrect.
OIL FILTER
When replacing the oil filter, Chrysler Corporation