Sierra, Silverado 2006-2007

Oil Pan

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Removal & Installation



4.3L Engines
  1. Drain the engine oil.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Raise and support the vehicle.
  6.  
  7. Remove or disconnect the following:

    Oil pan skid plate bolts and plate, if equipped
     
    Engine oil and filter
     
    Crossmember bolts and bar
     
    On 4WD, the front differential carrier
     
    Battery cable bracket bolts.
     
    Starter
     
    Transmission cover
     
    Positive battery cable clip bolt
     
    Oil level sensor electrical connector
     
    Transmission
     
    Oil level sensor and discard
     
    Oil pan bolts and oil pan
     
    Oil pan gasket
     

  8.  

To install:

  1. Thoroughly clean all gasket surfaces,
  2.  
  3. Apply a 5 mm wide and 25 mm long bead of sealant to both the right and left sides of the engine front cover to engine block junction at the oil pan sealing surfaces.
  4.  
  5. Apply a 5 mm wide and 25 mm long bead of sealant to both the right and left sides of the crankshaft rear oil seal housing to engine block junction at the oil pan sealing surfaces.
  6.  
  7. Install or connect the following:

    Transmission
     
    New gasket
     
    Oil pan and new gasket
     
    Install the oil pan bolts and nuts, but do not tighten
     

  8.  
  9. Measure the pan-to-transmission housing clearance using a feeler gage and a straight edge. Use a feeler gage to check the clearance between the oil pan-to-transmission housing measurement points. If the clearance exceeds 0.011 in. (0.3 mm) at any of the 3 oil pan-to-transmission housing measurement points (1), then repeat the step until the oil pan-to-transmission housing clearance is within the specification. The oil pan must always be forward of the rear face of the engine block.
  10.  
  11. Install the oil pan bolts, nuts and reinforcements. Torque bolts in sequence to 18 ft. lbs. (25 Nm).

    Oil level sensor electrical connector
     
    Positive battery cable clip bolt
     
    Transmission cover
     
    Starter
     
    Battery cable bracket bolts.
     
    On 4WD, the front differential carrier
     
    Crossmember bolts and bar
     
    Engine oil and filter
     
    Oil pan skid plate bolts and plate, if equipped
     
    Negative battery cable
     

  12.  
  13. Refill the engine with oil.
  14.  

4.8L, 5.3L, 6.0L & 6.2L Engines

NOTE
The original oil pan gasket is retained and aligned to the oil pan by rivets. When installing a new gasket, it is not necessary to install new rivets. DO NOT reuse the oil pan gasket. When installing the oil pan, install a NEW oil pan gasket.

  1. Remove or disconnect the following:

    Negative battery cable
     
    Front differential if equipped with four wheel drive
     
    Under body shield from the vehicle
     
    Oil pan shield
     
    On 2007 models (except Classic), unbolt steering rack and hang downwards

    Click image to see an enlarged view

    Fig. Oil pan shield-4.8L, 5.3L, 6.0L and 6.2L engines



    Click image to see an enlarged view

    Fig. Cross brace-4.8L, 5.3L, 6.0L and 6.2L engines

     



    Cross brace if equipped
     
    Engine oil and filter
     
    Transmission-to-oil pan bolts
     
    Oil level sensor electrical connector
     
    Two front wiring harness retainer bolts
     
    Engine wiring harness retainer bolts from the engine oil pan
     
    Engine oil cooler pipe-to-oil pan bolt
     
    Transmission oil cooler pipe retainer and the bolt from the oil pan
     
    Closeout covers and bolts (one each side of engine)
     
    Engine mount bolts each side
     
    Oil pan
     

  2.  

To install:


NOTE
The alignment of the structural oil pan is critical. The rear bolt hole locations of the oil pan provide mounting points for the transmission bell housing. To ensure the rigidity of the powertrain and correct transmission alignment, it is important that the rear of the block and the rear of the oil pan must NEVER protrude beyond the engine block and transmission bell housing plane.



Click image to see an enlarged view

Fig. Apply sealant at these points at the front of the block-4.8L, 5.3L and 6.0L engines



Click image to see an enlarged view

Fig. Apply sealant at these points at the rear of the block-4.8L, 5.3L and 6.0L engines

  1. Apply a 0.20 in. (5mm) bead of sealant GM P/N 12378190 or equivalent 0.8 in. (20mm) long to the engine block. Apply the sealant directly onto the tabs of the front cover gasket that protrudes into the oil pan surface.
    NOTE
    Be sure to align the oil gallery passages in the oil pan and engine block properly with the oil pan gasket.

  2.  
  3. Pre-assemble the oil pan gasket to the pan. Install the oil pan bolts to the pan through the gasket.
  4.  
  5. Install or connect the following:

    Oil pan gasket
     
    Oil pan
     
    Oil pan bolts, finger-tight. Do not over tighten.
     
    Two lower bell housing bolts to position the oil pan correctly
     

  6.  
  7. Snug the lower bell housing bolt finger-tight. Do not over tighten. Tighten the oil pan-to-block and oil pan-to-oil pan front cover bolts to 18 ft. lbs. (25 Nm). Tighten the oil pan-to-rear cover bolts to 106 inch lbs. (12 Nm). Tighten the bell housing bolts to 37 ft. lbs. (50 Nm).

    Transmission oil cooler pipe retainer and the bolt to the oil pan
     
    Engine oil cooler pipe-to-oil pan bolt and tighten to 89 inch lbs. (10 Nm)
     
    Engine wiring harness retainer bolts to the engine oil pan
     
    Oil level sensor electrical connector
     
    Transmission-to-oil pan bolts and tighten to 41 ft. lbs. (55 Nm)
     
    Front differential, if equipped with four wheel drive
     
    Underbody shield
     

  8.  
  9. Lower the vehicle. Fill the engine with oil and install the engine oil filter.
  10.  
  11. Connect the negative battery cable.
  12.  

6.6L Engine
Lower Oil Pan
  1. Drain the engine oil.
  2.  
  3. Remove or disconnect the following:

    Oil pan skid plate (2WD vehicles)
     
    Crossbar
     
    Oil level sensor connector
     
    Lower oil pan bolts and nuts
     
    Lower oil pan from the lower crankcase
     
    Lower oil pan
     

  4.  

To install:

Click image to see an enlarged view

Fig. Lower oil pan tightening sequence-6.6L engines

  1. Clean all sealing surfaces
  2.  
  3. Apply a 1 / 8 in. (2mm) bead of sealant to the oil pan sealing surface.
  4.  
  5. Install the oil pan. Tighten the bolts and nuts in sequence to 89 inch lbs. (10 Nm)
  6.  
  7. The remainder of installation is the reverse of the removal procedure.
  8.  
  9. Refill engine with oil.
  10.  

Upper Oil Pan
  1. Drain the engine oil.
  2.  
  3. Remove or disconnect the following:

    Front differential carrier (4WD vehicles)
     
    Relay rod from the pitman arm and idler arm (2WD vehicles)
     
    Transmission
     
    Lower oil pan
     
    Flywheel/flexplate
     
    Positive and negative battery cable bracket bolts and bracket from the front of the upper oil pan
     
    Positive and negative battery cable bracket nut and bracket from the right side of the upper oil pan
     
    2 engine flywheel housing to upper oil pan bolts (refer to denoted black triangles on accompanying figure)

    Click image to see an enlarged view

    Fig. Remove only the flywheel housing-to-upper oil pan bolts designated with a black triangle-6.6L engines

     



    Upper oil pan bolts and any brackets
     
    Upper oil pan from the engine block
     
    Upper oil pan. The oil dipstick tube needs to be removed while lowering the upper oil pan.
     

  4.  

To install:

  1. Clean all sealing surfaces
  2.  
  3. Apply a 1 / 8 in. (2mm) bead of sealant to the oil pan and flywheel sealing surfaces.
  4.  
  5. Install or connect the following:

    Upper oil pan; make sure the dipstick is installed into the upper pan
     
    Upper pan bolts and brackets. Tighten, in sequence, to 15 ft. lbs. (20 Nm).

    Click image to see an enlarged view

    Fig. Upper oil pan bolt tightening sequence-6.6L engines

     
    2 engine flywheel housing to upper oil pan bolts (refer to denoted black triangles on accompanying figure). Torque to 37 ft. lbs. (50 Nm).
     

  6.  
  7. The remainder of installation is the reverse of the removal procedure.
  8.  
  9. Refill engine with oil.
  10.  

8.1L Engine
  1. Disconnect the negative battery cable and drain the engine oil.
  2.  
  3. Remove or disconnect the following:
    NOTE
    You can reuse the oil pan gasket, if it is not damaged



    Front differential, if equipped with 4WD
     
    Starter motor
     
    Oil pan skid plate bolts and plate
     
    Crossbar bolt(s) and crossbar
     
    Oil level dipstick
     
    Oil level sensor electrical connector
     
    Engine harness clip from the oil pan
     
    Battery cable channel bolt
     
    Battery cable channel and reposition
     
    Oil pan bolts, oil pan and gasket
     

  4.  

To install:


NOTE
You must install the oil pan within 5 minutes of applying the sealer.

  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Apply sealant to the sides of the front and rear crankshaft bearing caps on the left and right sides.
  4.  
  5. Install or connect the following:

    Oil pan gasket into the oil pan groove
     
    Oil pan and bolts
     

  6.  
  7. Tighten the oil pan bolts, in sequence, as follows:
    1. 1st pass: 89 inch lbs. (10 Nm).
    2.  
    3. 2nd pass: 18 ft. lbs. (25 Nm).

      Click image to see an enlarged view

      Fig. Oil pan bolt tightening sequence-8.1L engines

    4.  

  8.  
  9. Install or connect the following:

    Battery cable channel and bolt. Tighten to 80 inch lbs. (9 Nm).
     
    Oil level sensor and tighten to 15 ft. lbs. (20 Nm)
     
    Engine harness clip
     
    Oil level sensor connector
     
    Oil level dipstick
     
    Crossbar and bolt(s). Tighten to 74 ft. lbs. (100 Nm).
     
    Skid plate. Tighten the bolts to 15 ft. lbs. (20 Nm).
     
    Starter motor
     
    Front differential
     
    Negative battery cable
     

  10.  
  11. Fill the crankcase with oil.
  12.  

 
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