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ENGINE OILING SYSTEM
9-53
O U T E R R O T O R
P L U N G E R
SEAL
K R 1 7 3
Fig. 122-Oil
Pump and Filter fDisassembled
V i e w 361,383
8
4 2 6 CL bic lnchl
(3) Remove the oil pressure relief valve plug care-
fully as
it
is under spring pressure. Remove the
spring and the valve.
(4) Clean all parts thoroughly.
Inspection and Repair
(1) Lay a straightedge across the oil pump cover
surface (Fig. 123). If a .0015 inch feeler gauge can be
inserted between the cover and the straightedge, the
cover should be replaced.
(2) For the 273 and 318 cubic inch engine, the out-
er rotor length should not be less than .825 inch (Fig.
124) and the outer diameter less than 2.469 inch. On
the 361, 383 and 426 cubic inch engines these dimen-
sions should not be less than .943 and 2.469 inch re-
spectively.
(3) If the inner rotor thickness measures less than
.825 inch for the 273 and 318 cubic inch engine (Fig.
125) or .942 inch for 361, 383 and 426 cubic inch en-
gines, a new rotor should be installed.
K B66A
Fig. 124-Measuring Outer Rotor Thickness
(4) Place the outer rotor in pump body. Press the
rotor to one side with the fingers and measure the
clearance between the rotor and pump body. If the
measurement is more than .012 inch, install a new oil
pump body (Fig. 126). (This test is not necessary if a
new pump body is being used.)
(5)
Place the inner rotor in the outer rotor. Meas-
ure the clearance between the inner rotor and outer
rotor. If measurement is more than .010 inch for 273
and 318 cubic inch engines or .010 inch (Fig. 127),
for 361, 383 and 426 cubic inch engine, install new
pump rotors.
(6) Place a straightedge across the pump body (be-
tween bolt holes). If feeler gauge of more than .004
inch (Fig. 128) can be inserted between the rotors and
a straightedge, install a new pump body and/or ro-
tors.
(7) Inspect the oil pump relief valve plunger for
scoring and for free oDeration in its bore. Small
KB 67A
Fig. 123-Measuring
Oil Pump Cover Flatness
Fig. 125-Measuring
Inner Rotor Thickness
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