(4) If inner rotor measures 14.299 mm (0.563 in.)
or less replace inner rotor (Fig. 142).
(5) Slide outer rotor into body, press to one side
with fingers and measure clearance between rotor
and body (Fig. 143). If measurement is 0.39 mm
(0.015 inch.) or more, replace body only if outer rotor
is in specifications.
(6) Install inner rotor into body. If clearance
between inner and outer rotors (Fig. 144) is 0.20 mm
(0.008 inch.) or more, replace both rotors.
(7) Place a straightedge across the face of the body,
between bolt holes. If a feeler gauge of 0.077 mm
(0.003 in.) or more can be inserted between rotors
and the straightedge, replace pump assembly (Fig.
145) ONLY if rotors are in specs.
(8) Inspect oil pressure relief valve plunger for
scoring and free operation in its bore. Small marks
may be removed with 400-grit wet or dry sandpaper.
(9) The relief valve spring has a free length of
approximately 49.5 mm (1.95 inches) it should test
between 23 – 25 pounds when compressed to 34 mm
(1 – 11/32 inches). Replace spring that fails to meet
specifications.
OIL PUMP ASSEMBLY
(1) Assemble pump, using new parts as required.
(2) Tighten cover screws to 12 N·m (105 in. lbs.).
(3) Prime oil pump before installation by filling
rotor cavity with engine oil.
(4) If oil pressure is low and pump is within spec-
ifications, inspect for worn engine bearings or other
reasons for oil pressure loss.
Fig. 142 Measuring Inner Rotor Thickness
Fig. 143 Measuring Outer Rotor Clearance in
Housing
1 – FEELER GAUGE
2 – OUTER ROTOR
Fig. 144 Measuring Clearance Between Rotors
1 – FEELER GAUGE
2 – OUTER ROTOR
3 – INNER ROTOR
Fig. 145 Measuring Clearance Over Rotors
1 – STRAIGHT EDGE
2 – FEELER GAUGES
LH 3.2/3.5L ENGINE 9 - 141
CLEANING AND INSPECTION (Continued)
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