LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Mechanical - 4.6L (4 Of 5)) >> Off-Vehicle Repair Instructions (2 Of 3) >> Crankshaft and Bearings Installation >> Crankshaft Bearing Clearance Measurement Procedure

Crankshaft Bearing Clearance Measurement Procedure

WARNING: This page is about a different variant/trim than selected.
  1. Place a length of fresh, room temperature plastic gaging material all the way across all the crankshaft bearing journals.
    2. Fig 1: View of lower Crankcase
    GM204108Courtesy of GENERAL MOTORS CORP.
  2. Align the lower crankcase with the dowel pins in the upper crankcase.
  3. Install the lower crankcase onto the upper crankcase slowly until feeling a positive stop.
  4. Inspect the upper-to-lower crankcase joint in order to make sure the lower crankcase is fully seated on the cylinder block.
    5. Fig 2: View of Oil Manifold Plate
    GM1551593Courtesy of GENERAL MOTORS CORP.
  5. Install the oil manifold plate.
    6. Fig 3: Identifying Oil Manifold Plate Bolts
    GM1551594Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  6. Install the oil manifold plate retaining bolts.

    Tighten:  Tighten the oil manifold plate bolts to 10 N.m (89 lb in).

    7. Fig 4: Identifying Stud-end Bolt
    GM204586Courtesy of GENERAL MOTORS CORP.
  7. Place the crankshaft oil scraper in position on the oil manifold. Align the holes with the main bearing bolt holes.
  8. Install the main bearing bolts. The single stud-head bolt (1) used for oil pump pick-up mounting goes in the inboard position of the third set of main bearing bolts from the front of the engine.
    9. Fig 5: Identifying Crankcase Perimeter Retaining Bolts on Left of Engine
    GM880592Courtesy of GENERAL MOTORS CORP.
  9. Install the left side upper-to-lower crankcase perimeter bolts.
    10. Fig 6: Identifying Crankcase Perimeter Retaining Bolts on Right of Engine
    GM204167Courtesy of GENERAL MOTORS CORP.
  10. Install the right side upper-to-lower crankcase perimeter bolts.
    11. Fig 7: Identifying Lower Crankcase Bolts
    GM639603Courtesy of GENERAL MOTORS CORP.
  11. Tighten the lower crankcase bolts in proper sequence.
    1. First Pass

      Tighten:  Tighten the lower crankcase bearing bolts (1-20) to 20 N.m (15 lb ft) in the proper sequence.

    2. Final Pass

      Tighten:  Tighten the lower crankcase bolts (1-20) an additional 65 degrees in the proper sequence using the J 45059  .

    12. Fig 8: Tightening Upper-to-lower Crankcase Perimeter Bolts
    GM639604Courtesy of GENERAL MOTORS CORP.
  12. Tighten the upper-to-lower crankcase perimeter bolts (1-8).

    Tighten:  Tighten the upper-to-lower crankcase perimeter bolts (1-8) to 30 N.m (22 lb ft).

  13. Allow the assembly to sit for at least two minutes.
  14. Remove the main bearing bolts.
  15. Remove the oil scraper.
  16. Remove the oil manifold retaining bolts and oil manifold.
  17. Remove the lower crankcase.
    18. Fig 9: Measuring Plastigage
    GM54236Courtesy of GENERAL MOTORS CORP.
  18. Determine the main bearing clearance by comparing the width of the flattened plastic gaging material at its widest point with the graduation on the gaging material container.
  19. Compare your measurements with the engine mechanical specifications. If the new bearings do not provide the proper crankshaft to bearing clearance, re-measure the crankshaft journals for the correct specified size and check to make sure you have the correct new bearings. If the crankshaft journals are incorrectly sized, replace the crankshaft. No crankshaft machining is permitted and undersized bearings are not available.
  20. Clean the plastic gaging material from the crankshaft bearings and/or crankshaft bearing journals using a soft lint-free cloth.
  21. Coat the upper crankshaft bearings and crankshaft main bearing journals with GM crankshaft prelube GM P/N 1052367, (Canadian P/N 992869), or equivalent.
    22. Fig 10: View of Crankshaft
    GM204793Courtesy of GENERAL MOTORS CORP.
  22. Reinstall the crankshaft into position in the cylinder block.
scientia non olet · About LEMON Manuals