Chrysler Engine >> OIL PUMP FAILURES

Chrysler Engine >> OIL PUMP FAILURES

Oil Pump And Distributor Shaft Failures On
All Chrysler Equipped 5.2L (318 CID) Engines

Oil pump or distributor drive shaft failure on Chrysler 5.2L (318 CIM) engines may be caused by the lack of flatness or squareness of the oil pump mounting surface on the rear main bearing cap. Check to determine of there is a lack of uniformity in the machining marks on the surface indicating a faulty final
machining operation (Fig. 1). Also determine if there appears to be an interference of the drive shaft in the pump shaft during assembly.

The squareness of this area can be checked by placing a straight edge across the pump mounting surface and measuring to the cylinder block oil pan surface at two points. If the difference in distance from the straight edge to the block is more than .060 in a 6 span, the cap is excessively out of square, and the
cap should be remachined.

This condition should not be corrected with a file or other hand methods. Set up the cap in a mill by locating on the cylinder block face of the cap and machine the oil pump mounting surface to the 2.43 dimension shown in Fig. 2. Extend the threads for the oil pump mounting screws as far as possible into the present
holes in the cap with a 3/8-16 bottoming tap.

Make a spacer of 3/16 thick soft aluminum as per Fig. 3.

After the cap is reinstalled on the cylinder block, assemble the pump to the cap with the 3/16 spacer between the pump and the cap. Use 1-1/2 long 3/8-16 screws to attach the pump in place of the original 1-1/4 screws.


The AERA Technical Committee

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