GM Cadillac 1967-1989 Repair Guide

Oil Pan

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REMOVAL & INSTALLATION



See Figures 1, 2, 3 and 4

Except Eldorado and 1980 and Later Seville

6-252 ENGINE



  1. Raise the vehicle and support on jackstands.
  2.  
  3. Drain the engine oil and remove the oil filter.
  4.  


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 flywheel cover and the exhaust crossover pipe.
  2.  
  3. Raise the engine, remove the oil pan bolts and lower the oil pan.
  4.  
  5. To install reverse the removal procedure. Clean the gasket surface of the pan and block and use a new gasket.
  6.  

8-250 ENGINE
  1. Disconnect the negative battery cable.
  2.  
  3. Jack the car up and support it with jackstands.
  4.  
  5. Drain the engine oil and remove the oil filter.
  6.  

  1. Remove the flywheel inspection cover and support struts.
  2.  
  3. Disconnect the exhaust Y-pipe at the exhaust manifolds and remove the one bolt at the catalytic converter bracket.
  4.  
  5. Remove the oil pan screws, lower the exhaust pipe, and remove the oil pan.
  6.  

If the pan is difficult to remove, lightly tap the edges of the pan with a plastic hammer.

  1. Seal the oil pan to the block with RTV sealant.
  2.  
  3. Tighten the oil pan retaining screws and nuts to 11 ft. lbs. (15 Nm).
  4.  
  5. The remainder of the installation is the reverse of removal.
  6.  

8-307 ENGINE
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the oil level indicator, and the fan shroud.
  4.  
  5. Raise and support the vehicle on jackstands. Drain the oil from the engine.
  6.  

  1. Remove the flywheel cover.
  2.  
  3. Remove the exhaust crossover pipe from the manifold and the catalytic converter.
  4.  

It may be necessary to remove the starter.

  1. Cadillac recommends installing an engine support and adapter under the engine.
  2.  
  3. Remove front engine mounts.
  4.  
  5. Raise the front of the engine as high as possible.
  6.  
  7. Remove the oil pan bolts and lower the pan.
  8.  
  9. Using a putty knife, clean the gasket mounting surfaces.
  10.  

To install:
  1. Apply sealer to both sides of the gasket.
  2.  
  3. Install the oil pan gasket.
  4.  
  5. Apply G.E.1673 or equivalent RTV sealer to both oil pan seals. Install the oil pan. Torque the oil pan bolts to 10 ft. lbs. (14 Nm), nuts to 17 ft. lbs. (23 Nm).
  6.  
  7. Lower the engine and install the mounts. Torque to 75 ft. lbs. (102 Nm).
  8.  
  9. Remove the engine support.
  10.  
  11. Install the crossover pipe.
  12.  
  13. Install the starter.
  14.  
  15. Install the flywheel cover and lower the vehicle.
  16.  
  17. Install the oil level indicator.
  18.  
  19. Fill the crankcase with oil.
  20.  

8-350 and 368 ENGINES
  1. Remove the wheel housing struts from the fenders. Disconnect the negative battery terminal.
  2.  
  3. Remove the 3 screws from the upper radiator shroud, two securing the shroud, and one securing the top radiator hose. Drill out the rivets securing the upper shroud to the lower one and remove the shroud. Use bolts and nuts to replace the rivets when reinstalling the shroud.
  4.  
  5. Loosen the drive belts and remove the crankshaft pulley.
  6.  
  7. Jack up your car and support it with jackstands.
  8.  
  9. Remove the through-bolt from each motor mount.
  10.  
  11. Remove the crossover pipe and the converter as an assembly.
  12.  
  13. Remove the starter.
  14.  
  15. Remove the torque converter cover.
  16.  
  17. Drain the oil pan.
  18.  

  1. Using a jack, with a block of wood on top, place it under the crankshaft hub. Jack up the engine, remove the pan bolts and the pan.
  2.  
  3. Clean all the gasket material from the pan and the block mating surfaces. Use a new gasket kit and sealer. Make sure the seals are firmly positioned on the flange surfaces with each seal properly located in the cut-out notches of the pan gasket.
  4.  
  5. Installation is the reverse of removal. Torque the pan bolts to 10 ft. lbs. (14 Nm).
  6.  

8-425, 429, 472 AND 500 ENGINES
  1. Drain engine oil and disconnect negative battery cable.
  2.  

  1. Disconnect exhaust crossover pipe at exhaust manifolds.
  2.  
  3. Disconnect exhaust support bracket at transmission extension housing, and position exhaust system to one side.
  4.  
  5. Remove starter motor.
  6.  
  7. Remove two idler arm support mounting screws from frame side member, and lower support.
  8.  
  9. Disconnect pitman arm at drag link, and lower steering linkage.
  10.  
  11. Remove the transmission lower cover.
  12.  
  13. Remove engine oil pan.
  14.  
  15. When reinstalling, reverse above procedure and torque oil pan screws and nuts to 10 ft. lbs. (14 Nm). The transmission cover screws should be torqued to 20 ft. lbs. (27 Nm).
  16.  

1967-78 Eldorado
  1. Remove engine as previously described in Engine removal and installation.
  2.  
  3. Drain engine oil.
  4.  

  1. Remove the transmission lower cover.
  2.  
  3. Remove nuts and cap screws that hold oil pan to cylinder block and engine front cover, then remove the oil pan.
  4.  
  5. Remove side gaskets and rubber front and rear seals from oil pan. Discard the gaskets and seals.
  6.  
  7. Install by reversing the removal procedure. Torque to 10 ft. lbs. (14 Nm). Use sealer in the corner notch openings.
  8.  

1979-85 Eldorado and 1980-85 Seville
  1. Disconnect the negative battery cable.
  2.  
  3. Raise the car on a hoist.
  4.  
  5. Remove the frame brace front attaching bolts from both sides and pivot the braces outward.
  6.  
  7. Remove the six securing bolts from the drive axle to the output shaft on both sides. Separate the flanges of the output shafts and drive axles to gain clearance for removal with the shafts attached.
  8.  
  9. Remove the battery cable-to-output shaft retaining screws and remove the two screws securing the support to the engine block.
  10.  
  11. Remove the final drive-to-transmission screw that holds the front of the shield. Remove the shield.
  12.  
  13. Remove the remaining final drive-to-transmission bolts.
  14.  
  15. Remove the final drive support bracket-to-engine block screw.
  16.  
  17. Using a puller, separate the steering linkage intermediate shaft from the pitman arm and the idler arm. Push the linkage toward the front of the car.
  18.  
  19. With the aid of a helper, slide the final drive assembly forward, off the transmission splined shaft, and remove the unit with the output shaft attached. Do not use the shafts as handles, as damage to the seals will occur.
  20.  
  21. Remove the battery cable and the wiring harness connectors from the starter solenoid BAT terminal.
  22.  
  23. Remove the harness connector from the solenoid S terminal.
  24.  
  25. Remove the harness from the clip on the solenoid and position it out of the way.
  26.  
  27. On some earlier years it may be necessary to remove the the starter motor attaching bolts and remove the starter.
  28.  
  29. Drain the engine oil.
  30.  

  1. On the 8-250 engine, it is necessary to raise the engine 1-2 in. Do not lift on the oil pan or the crankshaft. Use a 2 x 4 block of wood against the cylinder head ledge of the crankcase or against the cylinder head. Prop the engine up in this position.
  2.  
  3. Remove the oil pan attaching screws and remove the oil pan.
  4.  

On cars equipped with diesel engines it is necessary to loosen the motor mounts and jack up the engine slightly to remove the oil pan.

  1. Reverse to install. Observe the following torques:
  2.  
  3. oil pan screws: 10 ft. lbs. (14 Nm)
  4.  
  5. engine-to-frame crossmember nuts: 65 ft. lbs. (88 Nm)
  6.  
  7. final drive-to-transmission bolts: 30 ft. lbs. (41 Nm)
  8.  
  9. front support bracket-to-block: 50 ft. lbs. (68 Nm)
  10.  
  11. output shaft-to-drive axle: 60 ft. lbs. (81 Nm)
  12.  
  13. steering linkage intermediate shaft-to-pitman arm: 60 ft. lbs. (81 Nm)
  14.  

1986-89 Eldorado and Seville
  1. Disconnect the negative battery cable.
  2.  
  3. Raise the front of the vehicle and support it with safety stands.
  4.  
  5. Remove the oil pan drain plug and drain the oil.
  6.  

  1. Remove both flywheel covers.
  2.  
  3. Disconnect the crossover pipe for the exhaust system and position it out of the way.
  4.  
  5. Starting at the middle of each side and working out, remove the oil pan mounting bolts and nuts.
  6.  
  7. Remove the oil pan.
  8.  

To install:
  1. Clean the oil pan and cylinder block mating surfaces thoroughly.
  2.  
  3. Apply a 1 / 4 in. (6mm) bead of RTV sealant at the rear main bearing cap and the front cover-to-cylinder block joints.
  4.  
  5. Install the oil pan and tighten the mounting bolts and nuts to 12 ft. lbs. (16 Nm).
  6.  
  7. Install the two flywheel covers.
  8.  
  9. Install the drain plug and fill the engine with oil (see Capacities chart in Routine Maintenance ).
  10.  
  11. Install the crossover pipe.
  12.  
  13. Lower the vehicle and connect the negative battery cable.
  14.  



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Fig. Fig. 1: Oil pan installation - gaskets and seals may differ among engines



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Fig. Fig. 2: Removing the support - common oil pan removal



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Fig. Fig. 3: Removing oil pan bolts



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Fig. Fig. 4: Removing the oil pan

 
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