GM Firebird 1982-1992 Repair Guide

Oil Pan

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REMOVAL & INSTALLATION




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.

Except 2.5L Engine

See Figures 1 through 7



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Fig. Fig. 1: Oil pan-1982-86 V6



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Fig. Fig. 2: Oil pan-1987-92 V6



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Fig. Fig. 3: Oil pan-V8



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Fig. Fig. 4: Removing the oil pan bolts



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Fig. Fig. 5: Prying loose the oil pan



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Fig. Fig. 6: Removing the pan



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Fig. Fig. 7: Removing the pan gasket

  1. Disconnect the negative battery cable. Remove the air cleaner.
  2.  
  3. Remove the distributor cap (ignition coil and module on 3.8L Turbo engine). Remove the fan shroud assembly.
  4.  
  5. Raise the vehicle and support it safely with jackstands.
  6.  
  7. Drain the engine oil.
  8.  


CAUTION
Be sure that the catalytic converter is cool before proceeding.

  1. Remove the air injection pipe at the catalytic converter, if applicable.
  2.  
  3. Remove the catalytic converter hanger bolts. Disconnect the exhaust pipe at the manifold.
  4.  
  5. Remove the starter bolts, loosen the starter brace, then lay the starter aside.
  6.  
  7. Remove the front engine mount through-bolts.
  8.  
  9. Raise the engine enough to provide sufficient clearance for oil pan removal.
  10.  
  11. Remove the oil pan bolts.
  12.  

If the front crankshaft throw prohibits removal of the pan, turn the crankshaft to position the throw horizontally.

  1. Remove the oil pan from the vehicle.
  2.  
  3. Remove the old RTV sealant or gasket from the oil pan and engine block.
  4.  

To install:
  1. Run a 1 / 8 in. (3mm) bead of RTV around the oil pan sealing surface or install a new gasket. Remember to keep the RTV on the INSIDE of the bolt holes.
  2.  
  3. Install the pan and pan bolts. Torque the pan bolts to:

    2.8L & 3.1L V6 (M6 x 1 X 16.0 bolts): 6-9 ft. lbs. (8-12 Nm)
     
    2.8L & 3.1L V6 (M8 x 1.25 x 14.0 bolts): 15-22 ft. lbs. (20-30 Nm)
     
    3.8L V6: 89 inch lbs. (10 Nm)
     
    1982-84 V8 engine ( 5 / 16 -18 bolts): 165 inch lbs. (10 Nm)
     
    1982-84 V8 engine ( 1 / 4 -20 bolts): 80 inch lbs. (8 Nm)
     
    1985 V8 engine ( 5 / 16 -18 x 1.44 studs): minimum of 10 inch lbs.
     
    1985 V8 engine (stud nuts): 150-180 inch lbs. (17-20 Nm)
     
    1985 V8 engine ( 1 / 4 -20 x 0.56 bolts): 72-90 inch lbs. (8-10 Nm)
     
    1985 V8 engine ( 1 / 4 -20 x 0.50 x 0.56 studs): 72-90 inch lbs. (8-10 Nm)
     
    1986-92 V8 engine (stud nuts): 150-250 inch lbs. (17-28 Nm)
     
    1986-92 V8 engine ( 1 / 4 -20 x 0.56 bolts): 72-130 inch lbs. (8-14 Nm)
     
    1986-92 V8 engine ( 1 / 4 -20 x 0.50 x 0.56 studs): 72-130 inch lbs. (8-14 Nm)
     

  4.  
  5. Lower the engine and install the front engine mount through-bolts. Torque bolts to 48 ft. lbs. (65 Nm).
  6.  
  7. Install the starter and starter brace, then secure using starter bolts.
  8.  
  9. Connect the exhaust pipe at the manifold. Install the catalytic converter hanger bolts.
  10.  
  11. Install the air injection pipe at the catalytic converter.
  12.  
  13. Lower the vehicle.
  14.  
  15. Install the fan shroud assembly. Install the distributor cap.
  16.  
  17. Connect the negative battery cable at the battery and air cleaner.
  18.  
  19. Fill the engine with engine oil. On 3.8L turbo engine, replace the oil filter and prime with engine oil before installation.
  20.  
  21. Start the engine and check for leaks.
  22.  

2.5L Engine

See Figure 8



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Fig. Fig. 8: Oil pan-2.5L

  1. Disconnect the negative battery cable at the battery.
  2.  
  3. Raise the vehicle and support it safely with jackstands.
  4.  
  5. Drain the engine oil.
  6.  
  7. Disconnect the exhaust pipe at the manifold.
  8.  
  9. Loosen the exhaust pipe hanger bracket.
  10.  
  11. Remove the starter assembly.
  12.  
  13. Remove the flywheel dust cover.
  14.  
  15. Remove the front engine mount through-bolts.
  16.  
  17. Carefully raise the engine enough to provide sufficient clearance to lower the oil pan.
  18.  
  19. Remove the oil pan retaining bolts and remove the oil pan.
  20.  

To install:
  1. Clean all old RTV from the mating surfaces.
  2.  
  3. Install the rear gasket into the rear main bearing cap and apply a small amount of RTV where the gasket engages into the engine block.
  4.  
  5. Install the front gasket.
  6.  
  7. Install the side gaskets, using grease as a retainer. Apply a small amount of RTV where the side gaskets meet the front gasket.
  8.  
  9. Install the oil pan.
  10.  

Install the oil pan-to-timing cover bolts last, as these holes will not align until the other pan bolts are snug.

  1. Torque the pan bolts to 53 inch lbs. (6 Nm) for 1982-1985 models and 90 inch lbs. (10 Nm) for 1986 models.
  2.  
  3. Lower the engine and install the front mount through-bolts. Torque bolts to 48 ft lbs. (65 Nm).
  4.  
  5. Install the flywheel dust cover.
  6.  
  7. Install the starter assembly.
  8.  
  9. Connect the exhaust pipe at the manifold.
  10.  
  11. Tighten the exhaust pipe hanger bracket.
  12.  
  13. Lower the vehicle.
  14.  
  15. Connect the negative battery cable at the battery.
  16.  
  17. Fill the engine with engine oil and start engine. Check for leaks.
  18.  

 
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