GM Cutlass RWD 1970-1987 Repair Guide

Oil Pan

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REMOVAL & INSTALLATION



See Figures 1, 2, 3 and 4

L-6 Engine
  1. Disconnect the battery ground cable.
  2.  
  3. Remove the upper radiator support and the bracket to the upper hose. On cars with air-conditioning, remove the fan and clutch assembly.
  4.  
  5. Remove the fuel line at the fuel pump and the starter leads at the starter.
  6.  
  7. Raise the car and support it with jackstands. Drain the oil.
  8.  
  9. Remove the front motor mount bracket to motor mount bolts.
  10.  
  11. Remove the flywheel cover and the starter. Disconnect the automatic transmission linkage, if so equipped.
  12.  
  13. Disconnect the exhaust pipe at the manifold.
  14.  
  15. Position the timing mark in the six o'clock position.
  16.  
  17. Raise the engine with a jack at the crankshaft damper and remove the right engine mount with bracket.
  18.  
  19. Remove the oil pan attaching bolts and the oil pan. It may be necessary to raise the engine further to get the pan out. Be careful not to damage any cowl-mounted parts.
  20.  

To install:
  1. Use gasket sealer and new gaskets (if gaskets are used).Torque the pan bolts to 14 ft. lbs.(18Nm).
  2.  
  3. Lower the engine with a jack under the crankshaft pulley mounting.
  4.  
  5. Install the right engine mount and bracket.
  6.  
  7. Install the flywheel cover, the starter, and the transmission shift linkage. Install the exhaust manifold, fuel line, and radiator support and bracket.
  8.  
  9. Lower the vehicle
  10.  
  11. Refill the engine with oil.
  12.  
  13. Connect the negative battery cable.
  14.  
  15. Check for leaks
  16.  



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Fig. Fig. 1: Remove the flywheel cover



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Fig. Fig. 2: Remove the exhaust crossover pipe

Buick Built Engines
  1. Raise the car and support it with jackstands
  2.  
  3. Drain the oil.
  4.  
  5. Remove the flywheel cover.
  6.  
  7. Remove the exhaust crossover pipe.
  8.  
  9. Remove the oil pan attaching bolts and remove the oil pan.
  10.  

To install:
  1. Install the oil pan and connect the exhaust crossover pipe
  2.  
  3. Install the flywheel cover
  4.  
  5. Lower the vehicle
  6.  
  7. Refill the engine with oil
  8.  
  9. Check for leaks
  10.  



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Fig. Fig. 3: Make sure all the oil is drained before removing the oil pan bolts



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Fig. Fig. 4: Remove the oil pan from the vehicle

V8 Chevrolet Built Engines
  1. Disconnect battery ground cable.
  2.  
  3. Remove distributor cap.
  4.  
  5. Remove radiator upper mounting panel or fan shroud.
  6.  
  7. Remove fan.
  8.  
  9. Raise vehicle and support it with jackstands
  10.  
  11. Drain engine oil.
  12.  
  13. Disconnect exhaust or crossover pipes.
  14.  
  15. Remove converter housing underpan and splash shield. On cars with manual transmission, remove the starter, then remove the flywheel cover.
  16.  
  17. Rotate crankshaft until timing mark on torsional damper is at 6:00 o'clock position.
  18.  
  19. Remove front engine mount through bolts.
  20.  
  21. Raise engine and insert blocks under engine mounts.
  22.  
  23. Remove oil pan.
  24.  

To install:
  1. Install pan and front engine mount through bolts.
  2.  
  3. Connect starter, splash shield and convertor housing underpan,Install exhaust crossover pipes at the engine.
  4.  
  5. Install distributor cap and radiator mounting panel or shroud
  6.  
  7. Lower vehicle
  8.  
  9. Refill with engine oil and connect negative battery cable
  10.  
  11. Check for leaks
  12.  

V8 Oldsmobile Built Gasoline Engines Except 455
  1. Remove the distributor cap and align the rotor to No. 1 firing position. On 1978 and later models, align the timing marks so No. 1 is at top dead center.
  2.  
  3. Disconnect the battery ground cable and remove the dipstick.
  4.  
  5. Remove the upper radiator support and the fan shroud attaching screws.
  6.  
  7. Raise the vehicle and support it with jackstands
  8.  
  9. Drain the oil.
  10.  
  11. Remove the flywheel cover.
  12.  
  13. Remove the starter motor assembly.
  14.  
  15. Disconnect the exhaust pipes and the crossover pipe.
  16.  
  17. Disconnect the engine mounts and raise the front of the engine as far as possible.
  18.  
  19. Remove the oil pan attaching bolts and remove the pan.
  20.  

To install:
  1. Coat both sides of the new gasket with sealer when installing.
  2.  
  3. Install oil pan and torque bolts to 10 ft. lbs. (13Nm)
  4.  
  5. Install engine mounts and exhaust pipes.
  6.  
  7. Install the starter, flywheel cover and the radiator mount and fan shroud.
  8.  
  9. Lower the vehicle and install the distributor cap
  10.  
  11. Refill with engine oil connect the negative battery cable
  12.  
  13. Check for leaks
  14.  

Oldsmobile Built 455 V8 Engine
  1. Disconnect the negative battery cable. Unbolt the fan shroud.
  2.  
  3. Raise the car and support it with jackstands.
  4.  
  5. Drain the oil.
  6.  
  7. Remove the driveshaft. Disconnect the exhaust pipes and starter.
  8.  
  9. Support the rear of the engine and remove the flywheel housing inspection cover.
  10.  
  11. Disconnect the modulator line, speedometer cable, transmission oil cooler lines, and shaft linkage. Remove the transmission crossmember.
  12.  
  13. Remove the transmission.
  14.  
  15. Remove the flywheel and raise the front of the engine.
  16.  
  17. Remove the right engine mount and raise the engine about two inches. Install a wedge to hold the engine in position.
  18.  
  19. Loosen the left engine mount-to-block bolts enough to allow for the removal of the oil pan bolts.
  20.  
  21. Remove the oil pan bolts, free the pan from the block and disconnect the oil pump.
  22.  
  23. Remove the oil pan and the oil pump.
  24.  

To install:
  1. Clean all the gasket surfaces and apply sealer to both sides of the pan gasket. Install the gasket on the block. Install the front and rear rubber seals.
  2.  
  3. Hold the oil pan in the approximate position and install the oil pump, tightening the bolts to 35 ft. lbs. (47 Nm)
  4.  
  5. Install the oil pan. Install the flywheel.
  6.  
  7. Remove the edge holding the engine on the right side and install the engine mount.
  8.  
  9. Lower the front of the engine on the right side and install the engine mount.
  10.  
  11. Install the transmission crossmember and remove the support from the rear of the engine.
  12.  
  13. Connect the modulator line, speedometer cable, oil cooler lines, and transmission linkage.
  14.  
  15. Install the starter and connect the exhaust pipes.
  16.  
  17. Install the driveshaft.
  18.  
  19. Lower the car and refill with engine oil.
  20.  
  21. Install the fan shroud and connect the battery cable.
  22.  
  23. Check for leaks
  24.  

263 and 350 Oldsmobile Built Diesel Engines
  1. On V8's, remove the vacuum pump and drive (with A/C) or the oil pump drive (without A/C). On V6's, remove the oil pump drive and vacuum pump.
  2.  
  3. Disconnect the batteries and remove the dipstick.
  4.  
  5. Remove the upper radiator support and fan shroud.
  6.  
  7. Raise and support the vehicle using jackstands.
  8.  
  9. Drain the oil.
  10.  
  11. Remove the flywheel cover.
  12.  
  13. Disconnect the exhaust and crossover pipes.
  14.  
  15. Remove the oil cooler lines at the filter base.
  16.  
  17. Remove the starter assembly. Support the engine with a jack.
  18.  
  19. Remove the engine mounts from the block.
  20.  
  21. Raise the front of the engine mounts from the block.
  22.  
  23. Raise the front of the engine and remove the oil pan.
  24.  

To install:
  1. Install the oil pan and the engine mounts.
  2.  
  3. Install the starter assembly.
  4.  
  5. Install oil cooler lines, exhaust pipes and flywheel cover.
  6.  
  7. Install the radiator support and fan shroud.
  8.  
  9. Install oil pump drive and vacuum pump.
  10.  
  11. Refill with oil and connect batteries.
  12.  
  13. Check for leaks.
  14.  

 
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