Chrysler DODGE D150 1993 Service Manual page 670

Mating surface of the oil pump cover should be

smooth. Replace pump assembly if cover is scratched

Lay a straightedge across the pump cover surface

(Fig. 5). If a 0.038 mm (0.0015 inch) feeler gauge can

be inserted between cover and straightedge, pump

assembly should be replaced.

Fig. 5 Checking Oil Pump Cover Flatness

Measure thickness and diameter of OUTER rotor.

If outer rotor thickness measures 20.9 mm (0.825

inch) or less or if the diameter is 62.7 mm (2.469

inches) or less, replace outer rotor (Fig. 6).

Fig. 6 Measuring Outer Rotor Thickness

If inner rotor measures 20.9 mm (0.825 inch) or

less, replace inner rotor and shaft assembly (Fig. 7).

Slide outer rotor into pump body. Press rotor to the

side with your fingers and measure clearance be

tween rotor and pump body (Fig. 8). If clearance is

0.356 mm (0.014 inch) or more, replace oil pump as

Install inner rotor and shaft into pump body. If

clearance between inner and outer rotors is 0.203

mm (0.008 inch) or more, replace shaft and both ro

tors (Fig. 9).

Place a straightedge across the face of the pump,

between bolt holes. If a feeler gauge of 0.102 mm

Fig. 7 Measuring Inner Rotor Thickness

Fig. 8 Measuring Outer Rotor Clearance in Housing

Fig. 9 Measuring Clearance Between Rotors

(0.004 inch) or more can be inserted between rotors

and the straightedge, replace pump assembly (Fig.

Inspect oil pressure relief valve plunger for scoring

and free operation in its bore. Small m a r k s 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 t h a t fails

to meet these specifications (Fig. 11).

Show Quick Links