Dodge RAM TRUCK 1500 1995 Service Manual page 944

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5 J L ENGINE
Fig. 8 Measuring inner Rotor Thickness
Fig. 9 Measuring Outer Rotor Clearance In Housing
Install inner rotor and shaft into pump body, if
clearance between inner and outer rotors is
0.208
mm
(0.008
inch) or more, replace shaft and both ro­
tors (Fig. 10).
Fig. 10 Measuring Clearance Between Rotors
Place a straightedge across the face of the pump,
between bolt holes, if a feeler gauge of 0.102 mm
(0.004
inch) or more can be inserted between rotors
and the straightedge, replace pump assembly (Fig.
11).
BR
Fig. 11 Measuring Clearance Over Rotors
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.
The relief valve spring has a free length of approx­
imately 49.5 mm (1.95 inches). The spring should
test between 19.5 and 20.5 pounds when compressed
to 34 mm (1-11/32 inches). Replace spring that fails
to meet these specifications (Fig. 12).
If oil pressure was low and pump is within specifi­
cations, inspect for worn engine bearings or other
reasons for oil pressure loss.
RN98
Fig. 12 Proper Installation of Retainer Cap
MSSEmBLE
(1) Install pump rotors and shaft, using new parts
as required.
(2) Position the oil pump cover onto the pump
body. Tighten cover bolts to 11 N-m (95 in. lbs.)
torque.
(3) Install the relief valve and spring. Insert the
cotter pin.
(4) Tap on a new retainer cap.
(5) Prime oil pump before installation by filling ro­
tor cavity with engine oil.
INSTALLATION
(1) Install oil pump. During installation slowly ro­
tate pump body to ensure driveshaft-to-pump rotor
shaft engagement.