LEMON Manuals: Even more car manuals for everyone
Home >> Cadillac >> 2006 >> CTS V >> Repair and Diagnosis >> External Pages >> Different car >> Section 786 (Engine Mechanical - 4.6L (LH2) - Repair Instructions - Off Vehicle - 3 Of 3) >> Piston, Connecting Rod, and Bearing Installation >> Connecting Rod Bearing Clearance Measurement Procedure - Using Plastic Gaging

Connecting Rod Bearing Clearance Measurement Procedure - Using Plastic Gaging

WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: Connecting rod bearings that have been used in a running engine, must be replaced with NEW connecting rod bearings for reassembly.
  1. Before final assembly it is important to check the clearance of the new connecting rod bearings.
  2. Place a length of fresh, room temperature plastic gaging material all the way across the entire connecting rod bearing journal.
    3. Fig 1: Connecting Rod Cap
    GM947598Courtesy of GENERAL MOTORS CORP.
  3. 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.
    4. Fig 2: Paired Connecting Rod Bearing Cap Notches
    GM204770Courtesy of GENERAL MOTORS CORP.
  4. When properly installed, the connecting rod bearing cap notches should be paired, as shown, on the crankpin.
    5. Fig 3: Connecting Rod Cap
    GM947598Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Fastener Caution .
    NOTE: Reuse the old connecting rod bolts ONLY for measuring the connecting rod bearing clearance.
  5. Lubricate connecting rod bolts with engine oil and install in the connecting rod. Tighten the connecting rod bolts to 30 N.m (22 lb ft).
  6. Loosen the connecting rod bolts until the torque reading is zero.
    7. Fig 4: Connecting Rod Bolts
    GM947682Courtesy of GENERAL MOTORS CORP.
  7. Re-tighten the connecting rod bolts.
    1. First Pass

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

    2. Final Pass

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

  8. Allow the assembly to sit for at least 2 minutes.
    9. Fig 5: Connecting Rod Cap
    GM947598Courtesy of GENERAL MOTORS CORP.
  9. Remove the connecting rod cap bolts.
  10. Remove the connecting rod cap.
    11. Fig 6: Measuring Plastigage
    GM54236Courtesy of GENERAL MOTORS CORP.
  11. Determine the connecting rod bearing clearance by comparing the width of the flattened plastic gaging material at its widest point with the graduation on the gauging material container.
  12. Compare the measurements with the engine mechanical specifications. Refer to Engine Mechanical Specifications .
  13. 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.
  14. Clean the plastic gaging material from the connecting rod bearing and crankshaft connecting rod bearing journal using a soft lint-free cloth.
scientia non olet · About LEMON Manuals