Jeep Wagoneer/Commando/Cherokee 1957-1983 Repair Information

Oil Pump

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REMOVAL & INSTALLATION 4-134




CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

  1. Set number one piston at TDC in order to install the oil pump without disturbing the ignition timing.
  2.  
  3. Remove the distributor cover and note the position of the rotor. Keep the rotor in that position when the oil pump is installed.
  4.  
  5. Remove the cap screws and lockwashers that attach the oil pump to the cylinder block. Carefully slide the oil pump and its drive shaft out of the cylinder block.
  6.  

The oil pump is driven by the camshaft by means of a spiral gear. The distributor in turn is driven by the oil pump by means of a tongue on the end of the distributor shaft which engages a slot in the end of the oil pump shaft. Because the tongue and the slot are both machined off center, the two shafts can be meshed in only one position. Since the position of the distributor shaft determines the timing of the engine, and is controlled by the oil pump shaft, the position of the oil pump shaft with respect to the camshaft is important. If only the oil pump has been removed, install it so that the slot in the end of the shaft lines up with the tip of the distributor shaft and allows that shaft to slip into it without disturbing the original position of the distributor. If the engine has been disturbed, or both the distributor and the oil pump have been removed, follow the procedure given below:

  1. Turn the crankshaft to align the timing marks on the crankshaft and camshaft timing gears.
  2.  
  3. Install the oil pump gasket on the pump.
  4.  
  5. With the wider side of the slot on top, start the oil pump drive shaft into the opening in the cylinder, keeping the mounting holes in the body of the pump in alignment with the holes in the cylinder block.
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  7. Insert a long blade screwdriver into the distributor shaft opening in the side of the cylinder block and engage the slot in the oil pump shaft. Turn the shaft so that the slot is positioned at what would be roughly the nine-thirty position on a clock face.
  8.  
  9. Remove the screwdriver and observe the position of the slot in the end of the oil pump shaft to make certain it is properly positioned.
  10.  
  11. Replace the screwdriver and, while turning the screwdriver clockwise to guide the oil pump drive shaft gear into engagement with the camshaft gear, press against the oil pump to force it into position.
  12.  
  13. Remove the screwdriver and again observe the position of the slot. If the installation was properly made, the slot will be in a position roughly equivalent to the eleven o'clock position on the face of a clock, with the wider side of the slot still on the top. If the slot is improperly positioned, remove the oil pump and repeat the operation.
  14.  
  15. Coat the threads of the capscrews with gasket cement and secure the oil pump in place.
  16.  

6-225 Engine

  1. Remove the oil filter.
  2.  
  3. Disconnect the wire from the oil pressure indicator switch in the filter bypass valve cap.
  4.  
  5. Remove the screws that attach the oil pump cover assembly to the timing chain cover.
  6.  
  7. Remove the cover assembly and slide out the oil pump.
  8.  
  9. Installation is the reverse of removal. Torque the cover bolts to 12 ft. lb.
  10.  

6-226 Engine


CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

  1. Remove the engine from the truck.
  2.  
  3. Remove the oil pan.
  4.  
  5. Remove the lockwire from the rear intermediate main bearing bolts.
  6.  
  7. Unbolt the pump from the bearing cap.
  8.  
  9. Turn the engine so that no. 1 piston is at TDC compression.
  10.  
  11. Install the distributor. Rotate the oil pump driveshaft so that when the oil pump is installed, the pump driveshaft tongue engages the slot in the lower end of the distributor driveshaft. The slot at the top of the distributor shaft must be roughly parallel with the side of the block.
  12.  
  13. Install the pump and torque the attaching nuts to 35 ft. lb.
  14.  

6-230 Engine See Figure 1

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Fig. Fig. 1: Exploded view of the oil pump 6 cyl-230 engine

  1. Remove the fan.
  2.  
  3. Remove the three nuts that attach the pump to the timing case cover.
  4.  
  5. Pull the pump straight up and out of the cover. Discard the gasket.
  6.  
  7. Prime the pump with clean engine oil prior to installation. Always use a new gasket.
  8.  
  9. If the engine was not rotated during pump removal, simply install the pump, engaging the drive slots.
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  11. If the engine was rotated, turn the crankshaft until #1 piston is at TDC compression and the pointer on the timing marks is aligned with the 0 mark.
  12.  
  13. Position the pump and gasket on the mounting studs. Do not install the pump far enough to engage the drive gear. Insert a long screwdriver into the distributor shaft opening in the opposite side of the cover and engage the slot in the oil pump shaft. Turn the shaft so that the slot is in the 4 & 10 o'clock position with the narrow side of the shaft up. Remove the screwdriver and, with a light, look in the hole to see if the slot is properly positioned. Install the screwdriver again, and turn the screwdriver counterclockwise to guide the oil pump drive gear into engagement with the crankshaft. Press against the pump gear to force it into engagement. Remove the screwdriver and again observe the slot. If correctly positioned, it will be in the 3 & 9 o'clock position, with the narrow side still on top. Install the nuts.
  14.  

6-232 and 258 Engines See Figure 2

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Fig. Fig. 2: Exploded view of the oil pump 6 cyl-232 and 258 engines

  1. Drain the oil and remove the oil pan.
  2.  
  3. Remove the oil pump retaining screws and separate the oil pump and gasket from the engine block.
  4.  

Do not disturb the position of the oil pick-up tube and screen assembly in the pump body. If the tube is moved within the pump body, a new assembly must be installed to assure an airtight seal.

  1. Installation is the reverse of removal. Torque the short bolts to 10 ft. lb.; the long bolts to 17 ft. lb.
  2.  

8-304, 360 and 401 Engines See Figure 3

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Fig. Fig. 3: Exploded view of the oil pump 8 cyl-304, 360 and 401 engines

  1. Remove the retaining screws and separate the oil pump cover and gasket and the oil filter as an assembly from the pump body (timing chain cover).
  2.  
  3. Install the oil pump with a new filter. Torque the cover bolts to 55 in. lb.
  4.  

8-327 Engine

The oil pump is driven by the distributor driveshaft. Oil pump replacement does not, however, affect the timing of the distributor because the drive gear remains in mesh with the camshaft gear.

  1. Drain the oil and remove the oil pan.
  2.  
  3. Remove the oil pump attaching screws. Remove the pump and gasket from the engine.
  4.  
  5. Remove the pump cover by removing the cover attaching screws.
  6.  
  7. Installation is the reverse of removal.
  8.  

8-350 Engine See Figures 4 and 5

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Fig. Fig. 4: Exploded view of the oil pump 8 cyl-350 engine



Click image to see an enlarged view

Fig. Fig. 5: Exploded view of the oil pump and filter 8 cyl-327 engine

The oil pump is located on the right side of the timing chain cover. The housing of the oil pump is actually part of the timing chain cover. To remove the oil pump, remove the cover attaching screws, the cover and slide out the oil pump gears. When installing the oil pump, pack the spaces around the oil pump gears completely with petroleum jelly. Leave no air space between the gears. This is done so that the oil pump will start pumping oil immediately when the engine is started. Installation is the reverse of removal.

 
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