Dodge 2001 Ram 1500 Owner's Manual page 1368

BR/BE
OIL PUMP (Continued)
Fig. 64 Measuring Outer Rotor Clearance in Cover
1 - FEELER GAUGE
2 - OUTER ROTOR
clearance between inner and outer rotors is 0.150
mm (0.006 inch) or more, replace both rotors.
Fig. 65 Measuring Inner Rotor Clearance in Cover
1 - FEELER GAUGE
2 - OUTER ROTOR
3 - INNER ROTOR
Place a straightedge across the face of the timing
chain cover pump body, between bolt holes (Fig. 66).
If a feeler gauge of 0.077 mm (0.003 inch) or more
can be inserted between rotors and the straightedge,
and the rotors are within specifications, replace tim-
ing chain cover.
Inspect oil pressure relief valve plunger for scoring
and free operation in its bore. Small marks may be
removed with 400-grit wet or dry sandpaper.
The relief valve spring has a free length of approx-
imately 49.5 mm (1.95 inches). The spring should
test between 100 and 109 N (22.5 and 24.5 pounds)
Fig. 66 Measuring Clearance Over Rotors
1 - FEELER GAUGE
2 - STRAIGHT EDGE
when compressed to 34 mm (1-11/32 inches). Replace
spring that fails to meet these specifications.
If oil pressure was low and pump is within specifi-
cations, inspect for worn engine bearings or other
reasons for oil pressure loss.
INSTALLATION
(1) Lubricate both oil pump rotors using petroleum
jelly or lubriplate and install in the timing chain
cover. Use new parts as required (Fig. 67).
Fig. 67 Priming Oil Pump.
1 - FILL WITH PETROLEUM JELLY OR LUBER PLATE
ENGINE 8.0L 9 - 221