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Home >> Chevrolet >> 2005 >> Chevy Express H1500, Van Passenger >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Mechanical - 4.3L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Crankshaft and Bearings Cleaning and Inspection >> Measuring Connecting Rod Bearing Clearances - J 43690 Method

Measuring Connecting Rod Bearing Clearances - J 43690 Method

WARNING: This page is about a different variant/trim than selected.
  1. Remove the oil pan and other necessary components to gain access to the connecting rods. Remove the oil pump, screen, and deflector, when applicable.
  2. Rotate the crankshaft until the crankshaft journal/connecting rod to be measured is in the 10 o'clock position.
    3. Fig 1: Bearing Cap Bolts, Cap & Bearing Half
    GM317268Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The crankshaft must be secure with no movement or rotation in order to obtain an accurate reading. Remove an intermediate bearing cap, as required, in order to secure the crankshaft and allow measurement of connecting rod bearing clearances.
  3. Remove the bearing cap bolts, cap and bearing half.
    4. NOTE: Refer to Fastener Notice in Cautions and Notices.
  4. Insert a piece of paper card stock onto the crankshaft journal. Install the bearing half, bearing cap, and bolts. Refer to Fastener Tightening Specifications .
    5. Fig 2: Installing Foot & Bolt To Pivot Arm Assembly
    GM627102Courtesy of GENERAL MOTORS CORP.
  5. Install the foot (1) and bolt (2) to the pivot arm assembly (3). Tighten the bolt until snug.
    6. Fig 3: Installing Screw To Pivot Arm Assembly
    GM627106Courtesy of GENERAL MOTORS CORP.
  6. Install the screw (1 or 3) to the pivot arm assembly (2).
    7. Fig 4: Installing Pivot Arm Assembly Onto Connecting Rod
    GM627108Courtesy of GENERAL MOTORS CORP.
  7. Install the pivot arm assembly (1) onto the connecting rod.
    8. Fig 5: Positioning Screw Onto Small End Of Connecting Rod Bolt
    GM627107Courtesy of GENERAL MOTORS CORP.
  8. Position the foot of the pivot arm assembly over the large end of the connecting rod bolt.
  9. Position the screw (1) onto the small end of the connecting rod bolt and tighten securely.
    10. Fig 6: Installing Base & Bolt To Oil Pan Rail
    GM627109Courtesy of GENERAL MOTORS CORP.
  10. Install the base (1) and bolt (2) to the oil pan rail.
    11. Fig 7: Aligning Center Of Base W/Pivot Arm Assembly Screw
    GM627115Courtesy of GENERAL MOTORS CORP.
  11. Align the center of the base (1) with the screw (3) of the pivot arm assembly. Tighten the bolt (2) until snug.
    12. Fig 8: Aligning Pivot Arm Assembly Link On Connecting Rod Beam Plane
    GM627113Courtesy of GENERAL MOTORS CORP.
  12. Align the link (1) of the pivot arm assembly on a plane (3) equal to that of the connecting rod beam (2).
    13. Fig 9: Positioning Pivot Arm To Base & Inserting Pin
    GM627111Courtesy of GENERAL MOTORS CORP.
  13. With the link of the pivot arm assembly aligned to the beam of the connecting rod, position the pivot arm to the base and insert the pin (1).
    14. Fig 10: Pivot Arm Assembly Handle
    GM627116Courtesy of GENERAL MOTORS CORP.
  14. Insert the handle (1) to the pivot arm assembly.
    15. Fig 11: Installing Swivel Base & Adapter
    GM627118Courtesy of GENERAL MOTORS CORP.
  15. Select the adapter (2), as required, and install to the swivel base (1). Tighten until snug.
    16. Fig 12: View Of Swivel Base & Dial Indicator
    GM627122Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The clamp of the swivel base and the shaft of the indicator should be free of oil or other debris. A loose or improperly clamped indicator may indicate incorrect readings.
  16. Install the indicator (2) to the swivel base (1). Tighten the clamp of the base until snug.
    17. Fig 13: Installing Swivel Base To Oil Pan Rail
    GM627124Courtesy of GENERAL MOTORS CORP.
  17. Install the swivel base (1) to the oil pan rail of the engine block. Tighten until snug.
    18. Fig 14: Swivel Base Locking Lever
    GM627126Courtesy of GENERAL MOTORS CORP.
  18. Adjust the swivel base as required and position the indicator tip slightly above the connecting rod cap. Lock the swivel base in position by rotating the locking lever (1). Do not allow the tip of the indicator to contact the connecting rod at this time.
    19. Fig 15: Proper Indicator Positioning
    GM627129Courtesy of GENERAL MOTORS CORP.
  19. The tip of the indicator should be positioned above and NOT in contact with the cap end of the connecting rod.
    20. Fig 16: Swivel Base Fine Adjustment Knobs
    GM627132Courtesy of GENERAL MOTORS CORP.
  20. Rotate the fine adjustment knobs on the dial indicator end of the swivel base to position the tip of the indicator in contact with the connecting rod.
    21. Fig 17: Actuating Pivot Arm Assembly Handle
    GM627141Courtesy of GENERAL MOTORS CORP.
  21. Lightly actuate the handle of the pivot arm assembly, multiple times in both directions, to ensure the oil film is removed from the journal.
    22. Fig 18: Dial Indicator
    GM627135Courtesy of GENERAL MOTORS CORP.
  22. Load the handle in the forward position and zero the dial indicator. Load the handle multiple times in both directions and record the reading.
    23. IMPORTANT: During this procedure, card stock may enter the crankshaft journal oil galleries. Be sure to remove all card stock from the bearing journal and oil galleries prior to reassembly.
  23. Remove the bearing cap bolts, cap, and paper stock.
  24. Replace bearing halves as required to obtain the proper bearing clearances.
  25. Install the bearings, cap, and bolts. Refer to Fastener Tightening Specifications .
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