30—ENGINE
CHRYSLER SERVICE MANUAL
PUMP BODY
51x67
Fig.
53—Measuring Thickness of Pump Rotor
c. Inspection and Repair
Wash all parts thoroughly. The mating face of
oil pump cover should be smooth. Replace cover
if it is scratched or grooved.
Lay a straightedge across cover surface
(Fig. 51). If a .0015 inch feeler gauge can be
inserted between cover and straightedge, the
cover should be replaced. If outer rotor meas-
ures less than .998 inch (Fig. 52) and diameter
less than 2.244 inches, replace outer rotor. If
pump rotor measures less than .998 inch (Fig.
53) a new pump rotor should be installed.
Slide outer rotor and rotor into pump body
and place a straightedge across face (between
bolt holes), as shown in Figure 54. If a feeler
gauge of more than .004 inch can be inserted
between rotors and straightedge, replace pump
body. Remove pump rotor and shaft, leaving
outer rotor in pump cavity. Press rotor body to
one side with fingers and measure clearance be-
tween outer rotor and pump body, (Fig. 55).
If measurement is more than .012 inch, replace
oil pump body. If clearance between pump rotor
and outer rotor (Fig. 56) is more than .010
inch, replace pump rotor and outer rotor. Check
OUTER ROTOR
FEELER STOCK •
57x126
Fig.
55—Measuring Clearance between Outer Rotor
and Oil Pump Body
oil pump relief valve plunger for scoring and
for free operation in its bore. If plunger is
scored, replace plunger. The spring should con-
form to Specifications on chart. If, for any rea-
son, the spring has to be replaced, the same
color spring should be used. An exception is
where oil pressure is either above or below
specifications. When assembling oil pump, be
sure to use a new oil seal ring between cover
and body. Tighten cover bolts to 10 foot-pounds
torque. Prime the oil pump.
RELIEF VALVE SPRING CHART
Color
Gray (Lt.). .
Red (Std.)..
Brown (Hvy.
Free
Height
3 y
32
inch
227/
32
inch
)23i/
32
inch
Under
Load
Height
2%
6
inch
2y
16
inch
2y
16
inch
Tension
Pounds
16.1 to 17.1
19.5 to 20.5
22.0 to 23.9
d. Installation
Make sure rear main bearing cap hollow dowel
is in position in cylinder block, as shown in
FEELER STOCK
OUTER ROTOR
INNER ROTOR
STRAIGHT EDGE <<VKr 57
X
)27
Fig.
54—Measuring Clearance over Oil Pump Rotor
FEELER STOCK
w
#
57x125 »
Fig.
56—Measuring Clearance Between Pump Rotors
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