GM Full-Size Trucks 1980-1987 Repair Guide

Oil Pan

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REMOVAL & INSTALLATION



In-line 6 Cylinder
  1. Disconnect the negative battery cable. Raise the vehicle and support it safely. Drain the engine oil.
  2.  
  3. Remove the flywheel cover. Remove the starter assembly.
  4.  
  5. Remove the engine mount through bolts from the engine front mounts. Raise the engine enough to remove the oil pan.
  6.  
  7. Remove the oil pan retaining bolts. Remove the oil pan from the engine.
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  9. Installation is the reverse of the removal procedure. Use new gaskets or RTV sealant, as required. Torque the pan to front cover bolts to 45 inch lbs. Torque the 1 /4 in. pan to block bolts to 80 inch lbs. and the 5 /16 in. bolts to 165 inch lbs.
  10.  

Gasoline V8 and V6 Engines

See Figures 1, 2, 3 and 4

  1. Disconnect the negative battery cable. Remove the air cleaner assembly, as required. Remove the distributor cap, if necessary.
  2.  
  3. Raise the vehicle and support it safely. Be sure to support the vehicle of jackstands at a sufficient height to allow ground clearance with the entire length of the oil pan as it will have to be tilted almost vertically for removal.
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  5. Drain the engine oil, then remove the flywheel cover and the starter assembly.
  6.  



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Fig. Fig. 1: The starter assembly and flywheel cover must be removed for access.



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Fig. Fig. 2: Loosen and remove the oil pan bolts using a ratchet, extension and suitable socket

  1. On some vehicles equipped with V6 engine, remove the strut rods at the flywheel cover, as necessary.
  2.  
  3. On 4WD vehicles with automatic transmission, remove the strut rods at the engine mounts.
  4.  
  5. On vehicles equipped with gauges, remove the oil pressure line from the side of the engine block to avoid damage when raising the engine. If necessary, remove the oil filter.
  6.  


CAUTION
Take extreme caution if the engine must be raised to remove the oil pan. Make sure the engine lift or hydraulic jack is firmly set. If at all possible, block the engine in this position using wooden blocks between the engine block or engine mounts and jackstands or the vehicle frame rail.

  1. On most vehicles it will be necessary to raise the engine in order to gain clearance for oil pan removal. If necessary, carefully jack the engine slightly using a block of wood under the transmission tail Section or using a engine lift. If additional clearance is necessary, remove the engine mount through-bolts before raising the engine. Remove the oil pan retaining bolts.
  2.  



Click image to see an enlarged view

Fig. Fig. 3: Pivot the oil pan rearward and begin to pull it down



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Fig. Fig. 4: Once the pan clears the engine and the lower crossmember you will be free to remove it from the vehicle

  1. Pivot the oil pan downward and the rear and carefully lower it from the engine.
  2.  
  3. Installation is the reverse of the removal procedure. Use new gaskets or RTV sealant, as required. On the V6 engine torque the pan retaining bolts to 100 inch lbs. On the small block V8 engines torque the bolts to 100 inch lbs. and the nuts to 200 inch lbs. On some 350 engines so equipped, torque the oil pan baffle bolts to 26 ft. lbs. On the 454 V8 engine torque the pan to front cover to 70 in. lbs. and the pan to block to 135 inch lbs.
  4.  

Diesel Engines
  1. Remove the vacuum pump and drive (with air conditioning) or the oil pump drive (without air conditioning).
  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 truck. Drain the oil.
  8.  
  9. Remove the flywheel cover.
  10.  
  11. Disconnect the exhaust and crossover pipes.
  12.  
  13. Remove the oil cooler lines at the filter base.
  14.  
  15. Remove the starter assembly. Support the engine with a jack.
  16.  
  17. Remove the engine mounts from the block.
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  19. Raise the front of the engine and remove the oil pan.
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  21. Installation is the reverse of removal. On the 8-379 diesel engine torque all but the rear two pan retaining bolts to 84 in. lbs. and the two rear bolts to 17 ft. lbs. On the 8-350 diesel engine torque all pan retaining bolts to 10 ft. lbs.
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