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9 - 60
5.2L/5.9L ENGINE
•
OIL PUMP
I t i s necessary t o remove the o i l pan, and remove
t h e o i l p u m p f r o m rear m a i n bearing cap to service
t h e o i l p u m p .
DISASSEMBLY
(1) To remove the r e l i e f valve, proceed as follows:
(a) Remove cotter p i n , d r i l l a 3.175 m m (1/8
inch) hole i n t o the r e l i e f valve retainer cap and i n -
sert a self-threading sheet m e t a l screw into cap.
(b) C l a m p screw i n t o a vise and w h i l e support-
i n g o i l p u m p , remove cap b y t a p p i n g pump body
u s i n g a soft hammer. Discard retainer cap and re-
move s p r i n g and r e l i e f valve (Fig. 16).
Fig.
16 Oil Pressure
Relief Valve
(Disassembled)
(2) Remove o i l pump cover bolts and lockwashers,
and l i f t o f f cover.
(3) Discard o i l seal r i n g .
(4) Remove pump rotor and shaft, and l i f t out outer
rotor.
(5) Wash a l l parts i n a suitable solvent and inspect
carefully for damage or wear (Fig. 17).
INNER ROTOR
DISTRIBUTOR DRIVESHAFT
Fig.
17 Oil Pump
INSPECTION
AND
REPAIR
(1) Clean a l l parts thoroughly. M a t i n g surface o f
the o i l pump cover should be smooth. Replace p u m p
assembly i f cover is scratched or grooved.
(2) L a y a straightedge across the p u m p cover sur-
face (Fig. 18). I f a 0.038 m m (0.0015 inch) feeler
gauge can be inserted between cover and s t r a i g h t -
edge, p u m p assembly should be replaced.
Fig.
18 Checking Oil Pump Cover
Flatness
(3) Measure thickness a n d diameter o f O U T E R ro-
tor. I f outer rotor thickness measures 20.9 m m (0.825
inch) or less, (Fig. 19), or the diameter is 62.7 m m
(2.469 inches) or less, replace outer rotor.
Fig.
19 Measuring
Outer Rotor
Thickness
(4) I f I N N E R rotor measures 20.9 m m (0.825 inch)
or less replace i n n e r rotor and shaft assembly (Fig.
20).
(5) Slide outer rotor i n t o pump body w i t h large
chamfered
edge installed i n w a r d i n t o p u m p
body
(Fig. 21), press t o one side w i t h fingers and measure
clearance between rotor and pump body (Fig. 21). I f
measurement is 0.356 m m (0.014 inch) or more, re-
place o i l pump assembly.
(6) I n s t a l l i n n e r rotor and shaft i n t o p u m p body. I f
clearance between inner and outer rotors (Fig. 22) is
0.203 m m (0.008 inch) or more, replace shaft a n d
both rotors.
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