Oil Pump
DISASSEMBLY
1. Remove the bolts holding the reaction shaft support to the oil pump (Fig. 100).
2. Remove the reaction shaft support from the oil pump (Fig. 100).
3. Remove all bolts holding the oil pump halves together (Fig. 100).
4. Using suitable prying tools, separate the oil pump sections by inserting the tools in the supplied areas and prying the halves apart.
NOTE: The oil pump halves are aligned to each other through the use of two dowels. Be sure to pry upward evenly to prevent damage to the oil pump components.
5. Remove the screws holding the separator plate onto the oil pump body (Fig. 101).
6. Remove the separator plate from the oil pump body (Fig. 101).
7. Mark all gears for location. The gears are select fit and if the oil pump is to be reused, the gears must be returned to their original locations.
8. Remove the oil pump gears from the oil pump case (Fig. 101).
9. Remove the oil pump valve retainers and associated valve and spring one at a time (Fig. 102) (Fig. 103). Mark the combination of components as a group and tag them as to the location from which they were removed.
CLEANING
Clean pump and support components with solvent and dry them with compressed air.
INSPECTION
Check condition of the seal rings and thrust washer on the reaction shaft support. The seal rings do not need to be replaced unless cracked, broken, or severely worn.
Inspect the pump and support components. Replace the pump or support if the seal ring grooves or machined surfaces are worn, scored, pitted, or damaged. Replace the pump gears if pitted, worn chipped, or damaged.
Inspect the pump reaction shaft support bushings. Replace either bushing only if heavily worn, scored or damaged. It is not necessary to replace the bushings unless they are actually damaged.
Inspect the valves and plugs for scratches, burrs, nicks, or scores. Minor surface scratches on steel valves and plugs can be removed with crocus cloth but do not round off the edges of the valve or plug lands. Maintaining sharpness of these edges is vitally important. The edges prevent foreign matter from lodging between the valves and plugs and the bore. Inspect all the valve and plug bores in the oil pump cover. Use a penlight to view the bore interiors. Replace the oil pump if any bores are distorted or scored. Inspect all of the valve springs. The springs must be free of distortion, warpage or broken coils.
Trial fit each valve and plug in its bore to check freedom of operation. When clean and dry, the valves and plugs should drop freely into the bores.
ASSEMBLY
1. Clean and inspect all components. Make sure that all passages are thoroughly cleaned and are free from dirt or debris. Make sure that all valves move freely in their proper bore. Make sure that all gear pockets and bushings are free from excessive wear and scoring. Replace the oil pump if any excessive wear or scoring is found.
2. Coat the gears with Mopar ATF +4 and install into their original locations.
3. Lubricate the oil pump valves with Mopar ATF +4 and install the valve, spring and retainer into the appropriate oil pump valve body bore (Fig. 102) (Fig. 103).
4. Place the separator plate onto the oil pump body (Fig. 101).
5. Install the screws to hold the separator plate onto the oil pump body (Fig. 101). Tighten the screws to 4.5 Nm (40 inch lbs.).
6. Position the oil pump cover onto the locating dowels (Fig. 100).
7. Seat the two oil pump halves together and install all bolts finger tight.
8. Torque all bolts down slowly starting in the center and working outward. The correct torque is 4.5 Nm (40 inch lbs.).
9. Verify that the oil pump gears rotate freely and smoothly.
10. Position the reaction shaft support into the oil pump (Fig. 100).
11. Install and torque the bolts to hold the reaction shaft support to the oil pump (Fig. 100). The correct torque is 12 Nm (105 inch lbs.).