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Fig. 20 Measuring
Inner Rotor
Thickness
Fig. 21 Measuring
Outer Rotor Clearance
in
Housing
OUTER
ROTOR
INNER,
ROTOR
RH179
Fig. 22 Measuring
Clearance Between
Rotors
(7) Place a straightedge
across t h e face of t h e
pump, between bolt holes. I f a feeler gauge of 0.004
i n c h (0.102 m m ) or more can be inserted between ro-
tors a n d t h e straightedge, replace p u m p assembly
(Fig. 23).
(8) Inspect o i l pressure r e l i e f valve plunger for
scoring a n d free operation i n i t s bore. S m a l l marks
m a y be removed w i t h 400-grit w e t 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-
p r o x i m a t e l y 49.0 m m (1.95 inch) and should test be-
5.2L/5.9L ENGINE
9 - 61
Fig. 23 Measuring
Clearance
Over Rotors
t w e e n 19.5 a n d 20.5 pounds w h e n compressed t o 34.0
m m (1-11/32 inches). Replace spring t h a t fails t o
meet specifications ( F i g . 24).
(10) I f o i l pressure i s low a n d pump is w i t h i n spec-
ifications, inspect f o r w o r n engine bearings or other
reasons for o i l pressure loss.
RN98
Fig. 24 Proper Installation of Retainer
Cap
OIL LINE PLUG
The o i l l i n e p l u g i s located i n the vertical passage
i n t h e block between the Oil-To-Filter and O i l - F r o m -
F i l t e r passages (Fig. 25). Improper i n s t a l l a t i o n or ab-
sence could cause erratic, low or no o i l pressure.
INSPECTION
(1) Remove o i l pressure sending u n i t from back o f
block.
(2) I n s e r t a 3.175 m m (1/8 inch) w i r e or equivalent
i n t o passage.
(3) P l u g should be 190.0 t o 195.2 m m (7-1/2 t o 7-
11/16 inches) f r o m machined surface of block ( F i g .
25).
(4) I f p l u g i s off location. Remove o i l pan a n d No. 5
m a i n b e a r i n g cap. Use suitable flat dowel to remove
p l u g and position p l u g properly. P l u g should be 54.0
to 57.7 m m (2-1/8 t o 2-5/16 inches) from b o t t o m o f
t h e block. Coat outside diameter of p l u g w i t h M O -
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