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Fig. 17 Measuring Inner Rotor
Thickness
(4) I f inner rotor measures 20.9 m m (0.825 inch) or
less, replace i n n e r rotor and shaft assembly (Fig. 17).
(5) Slide outer rotor i n t o p u m p body, press to one
side w i t h fingers and measure clearance between ro-
tor and p u m p body (Fig. 18). I f measurements
is
0.356 m m (0.014 inch) or more, replace o i l p u m p as-
sembly.
Fig. 18 Measuring Outer Rotor Clearance in
Housing
(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 is 0.203
m m (0.008 inch) or more, replace shaft and b o t h ro-
tors (Fig. 19).
(7) Place a straight edge across the face of the
pump, between bolt holes. I f a feeler gauge of 0.102
m m (0.004 inch) or more can be inserted between ro-
tors and the s t r a i g h t edge, replace p u m p assembly
(Fig. 20).
(8) Inspect o i l pressure r e l i e f valve plunger
for
scoring and free operation i n i t s bore. S m a l l m a r k s
may be removed w i t h 400-grit wet or d r y sandpaper.
(9) The r e l i e f valve spring has a free l e n g t h of ap-
proximately 49.5 m m (1.95 inches) a n d should test
between 19.5 and 20.5 pounds w h e n compressed to 34
m m (1-11/32 inch). Replace s p r i n g t h a t fails to meet
specifications (Fig. 21).
(10) I f oil pressure is low and p u m p is w i t h i n spec-
ifications, inspect for w o r n engine bearings or other
reasons for o i l pressure loss.
Fig. 19 Measuring Clearance Between Rotors
Fig. 20 Measuring Clearance Over Rotors
RN98
Fig. 21 Proper Installation of Retainer Cap
OIL PUMP ASSEMBLY
AND
INSTALLATION
(1) Assemble pump, u s i n g new parts as required.
(2) Tighten cover bolts to 11 N n n (95 i n . lbs.)
torque.
(3) Prime oil pump before i n s t a l l a t i o n by filling ro-
t o r cavity w i t h engine o i l .
(4) I n s t a l l o i l pump. D u r i n g i n s t a l l a t i o n slowly ro-
t a t e pump body to ensure driveshaft-to-pump rotor
shaft engagement. H o l d the o i l p u m p base
flush
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