GM Full-Size Trucks 1970-1979 Repair Guide

Oil Pan

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REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4 and 5



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Fig. Fig. 1: Drain the engine oil into a suitable container



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Fig. Fig. 2: Unfasten the retaining bolts ...



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Fig. Fig. 3: ... then remove the torque converter housing



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Fig. Fig. 4: After unfastening the bolts, remove the oil pan



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Fig. Fig. 5: Exploded view of a common oil pan mounting - gaskets and seals may differ among engine applications

Inline 6-Cylinder Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Raise the vehicle and support it safely. Drain the engine oil.
  4.  
  5. Remove the flywheel or torque converter cover/housing, as applicable. Remove the starter assembly.
  6.  
  7. Remove the engine mount through bolts from the engine front mounts. Raise the engine enough to remove the oil pan.
  8.  
  9. Unfasten the oil pan retaining bolts, then remove the oil pan from the engine.
  10.  
  11. Clean the gasket mating surfaces.
  12.  
  13. Installation is the reverse of the removal procedure. Use new gaskets or RTV sealant, as required. Tighten the pan-to-front cover bolts to 45 inch lbs. (5 Nm). Tighten the 1 / 4 in. pan-to-block bolts to 80 inch lbs. (9 Nm) and the 5 / 16 in. bolts to 165 inch lbs. (18 Nm).
  14.  

Gasoline V6 and V8 Engines
  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. Drain the engine oil. Remove the flywheel cover. Remove the starter assembly.
  4.  
  5. On some vehicles equipped with V6 engine, remove the strut rods at the flywheel cover, as necessary.
  6.  
  7. On 4wd vehicles with automatic transmission, remove the strut rods at the engine mounts.
  8.  
  9. On vehicles equipped with gauges, remove the oil pressure line from the side of the engine block to avoid damage when raising the engine. As necessary, remove the oil filter.
  10.  
  11. Properly raise the engine to gain clearance in order to remove the oil pan. Remove the oil pan retaining bolts. Remove the oil pan from the engine.
  12.  
  13. Installation is the reverse of the removal procedure. Use new gaskets or RTV sealant, as required. On the V6 engine, tighten the pan retaining bolts to 100 inch lbs. (11 Nm). On the small block V8 engines tighten the bolts to 100 inch lbs. and the nuts to 200 inch lbs. (22 Nm). On some 350 engines so equipped, tighten the oil pan baffle bolts to 26 ft. lbs. (35 Nm). On the 454 V8 engine, tighten the pan-to-front cover bolts to 70 inch lbs. (8 Nm) and the pan-to-block bolts to 135 inch lbs. (15 Nm).
  14.  

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.
  18.  
  19. Raise the front of the engine and remove the oil pan.
  20.  
  21. Installation is the reverse of removal. Tighten the pan retaining bolts to 10 ft. lbs. (13.5 Nm).
  22.  

 
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