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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 25 (Engine Mechanical - 4.6L (LH2) - 4 Of 5) >> Off-Vehicle Repair Instructions (Part 3) >> Piston, Connecting Rod, and Bearing Installation - Off Vehicle >> Connecting Rod Final Assembly Procedure

Connecting Rod Final Assembly Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: View Of Connecting Rod Cap
    GM947598Courtesy of GENERAL MOTORS CORP.
  1. Remove the connecting rod bolts.
  2. Remove the connecting rod cap.
    3. Fig 2: View Of EN 46121 & Connecting Rod Bolt Holes
    GM1527046Courtesy of GENERAL MOTORS CORP.
  3. Install the EN 46121  into the connecting rod bolt holes.
  4. Back the connecting rod away from the crankshaft in order to allow for lubricant application.
  5. Coat the crankshaft connecting rod bearing journal and installed connecting rod bearings with GM crankshaft prelube GM P/N 1052367, (Canadian P/N 992869), or equivalent.
  6. Guide the connecting rod onto the crankshaft connecting rod bearing journal.
  7. Remove the EN 46121  from the connecting rod bolt holes.
    8. Fig 3: View Of Connecting Rod Cap
    GM947598Courtesy of GENERAL MOTORS CORP.
  8. Install the connecting rod end cap on its original connecting rod making sure the bearing lock tangs are aligned on the same side of the rod.
    9. Fig 4: View Of Paired Connecting Rod Bearing Cap Notches
    GM204770Courtesy of GENERAL MOTORS CORP.
  9. When properly installed, the connecting rod bearing cap notches should be paired, as shown, on the crankpin.
    10. Fig 5: Loosening Connecting Rod Bolts
    GM947682Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
    IMPORTANT: DO NOT reuse the old connecting rod bolts.
  10. Lubricate the NEW connecting rod bolts with engine oil and install in the connecting rod.

    Tighten:  Tighten the NEW connecting rod bolts to 30 N.m (22 lb ft).

  11. Loosen the connecting rod bolts until the torque reading is zero.
  12. Re-tighten the connecting rod bolts.
    1. First Pass

      Tighten:  Tighten the connecting rod bolts to 25 N.m (18 lb ft).

    2. Final Pass

      Tighten:  Tighten the connecting rod bolts an additional 110 degrees using the J 45059  .

  13. During and after installation, ensure each piston is positioned properly in the correct cylinder.
  14. Repeat these procedures for the piston/connecting rod assembly that is using the common crankshaft connecting rod journal.
  15. Measure the connecting rod side clearance between the 2 connecting rods that share the common crankshaft connecting rod journal.
  16. Compare the measurements with the engine mechanical specifications. Refer to Engine Mechanical Specifications .
  17. If the connecting rods do not provide the proper crankshaft side clearance inspect for the following conditions:
    • If the clearance is too tight, ensure the connecting rods are not binding and can slide parallel to the crankpin. Re-measure the connecting rod widths for the correct specified size. If the connecting rods are incorrectly sized, replace the connecting rods.
    • If the clearance is too loose, re-measure the connecting rod widths for the correct specified size. If the connecting rods are incorrectly sized, replace the connecting rods.
  18. Repeat these procedures for the remaining piston/connecting rod assemblies using the J 39946  in order to rotate the crankshaft.
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